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AnhydridesAcetic AnhydridesPhthalic AnhydridesMaleic AnhydridesSuccinic AnhydridesCitraconic AnhydridesEpoxy ResinsFluoroacetatesAconitic AcidMaleatesDiethyl PyrocarbonateDisaccharidesTrifluoroacetic AcidPhthalic AcidsPyran CopolymerChemistryCoenzyme A-TransferasesChemical PhenomenaGas Chromatography-Mass SpectrometryFuransRutamycinNorbornanesRuminococcusAcylationBenzene DerivativesMolecular StructureSuccinatesMercaptoethylaminesIndicators and ReagentsFormatesMetals, Rare EarthMaleic HydrazideMetals, Alkaline EarthFructoseCrystallizationPatents as TopicCrystallography, X-RayX-Ray DiffractionEncyclopedias as TopicChemistry, OrganicAcetylationDictionaries, MedicalDictionaries as TopicElectronic MailFood Dispensers, AutomaticEditorial PoliciesAuthorshipPeriodicals as TopicPostal ServiceInternetMutagenicity TestsMutagensOenantheSalmonella typhimurium
Anhydrides: Chemical compounds derived from acids by the elimination of a molecule of water.Acetic Anhydrides: Compounds used extensively as acetylation, oxidation and dehydrating agents and in the modification of proteins and enzymes.Phthalic Anhydrides: Phthalic acid anhydrides. Can be substituted on any carbon atom. Used extensively in industry and as a reagent in the acylation of amino- and hydroxyl groups.Maleic Anhydrides: Used in copolymerization reactions, in the Diels-Alder(diene)synthesis, in the preparation of resins, pharmaceuticals and agricultural chemicals. It is a powerful irritant and causes burns.Succinic Anhydrides: A subclass of anhydrides with the general structure of dihydrofurandione. They can be substituted on any carbon atom. They modify and inhibit proteins and enzymes and are used in the acylation of amino- and hydroxyl groups.Citraconic Anhydrides: Methylmaleic anhydrides.Epoxy Resins: Polymeric resins derived from OXIRANES and characterized by strength and thermosetting properties. Epoxy resins are often used as dental materials.Fluoroacetates: Derivatives of acetic acid with one or more fluorines attached. They are almost odorless, difficult to detect chemically, and very stable. The acid itself, as well as the derivatives that are broken down in the body to the acid, are highly toxic substances, behaving as convulsant poisons with a delayed action. (From Miall's Dictionary of Chemistry, 5th ed)Aconitic AcidMaleatesDiethyl Pyrocarbonate: Preservative for wines, soft drinks, and fruit juices and a gentle esterifying agent.Disaccharides: Oligosaccharides containing two monosaccharide units linked by a glycosidic bond.Trifluoroacetic Acid: A very strong halogenated derivative of acetic acid. It is used in acid catalyzed reactions, especially those where an ester is cleaved in peptide synthesis.Phthalic Acids: A group of compounds that has the general structure of a dicarboxylic acid-substituted benzene ring. The ortho-isomer is used in dye manufacture. (Dorland, 28th ed)Pyran Copolymer: Copolymer of divinyl ether and maleic anhydride that acts as an immunostimulant with antineoplastic and anti-infective properties. It is used in combination with other antineoplastic agents.Chemistry: A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.Coenzyme A-Transferases: Enzymes which transfer coenzyme A moieties from acyl- or acetyl-CoA to various carboxylic acceptors forming a thiol ester. Enzymes in this group are instrumental in ketone body metabolism and utilization of acetoacetate in mitochondria. EC 2.8.3.Chemical Phenomena: The composition, conformation, and properties of atoms and molecules, and their reaction and interaction processes.Gas Chromatography-Mass Spectrometry: A microanalytical technique combining mass spectrometry and gas chromatography for the qualitative as well as quantitative determinations of compounds.Furans: Compounds with a 5-membered ring of four carbons and an oxygen. They are aromatic heterocycles. The reduced form is tetrahydrofuran.Rutamycin: A macrolide antibiotic of the oligomycin group, obtained from Streptomyces rutgersensis. It is used in cytochemistry as a tool to inhibit various ATPases and to uncouple oxidative phosphorylation from electron transport and also clinically as an antifungal agent.NorbornanesRuminococcus: A genus of gram-positive bacteria in the family Lachnospiraceae that inhabits the RUMEN; LARGE INTESTINE; and CECUM of MAMMALS.Acylation: The addition of an organic acid radical into a molecule.Benzene DerivativesMolecular Structure: The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.Succinates: Derivatives of SUCCINIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain a 1,4-carboxy terminated aliphatic structure.MercaptoethylaminesIndicators and Reagents: Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499)Formates: Derivatives of formic acids. Included under this heading are a broad variety of acid forms, salts, esters, and amides that are formed with a single carbon carboxy group.Metals, Rare Earth: A group of elements that include SCANDIUM; YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically, the rare earth metals got their name from the fact that they were never found in their pure elemental form, but as an oxide. In addition they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust.Maleic Hydrazide: 1,2-Dihydro-3,6-pyridazinedione. A herbicide and plant growth regulator; also used to control suckering of tobacco. Its residue in food and tobacco is highly toxic, causing CNS disturbances and liver damage.Metals, Alkaline Earth: Metals that constitute the group 2 (formerly group IIa) of the periodic table.Fructose: A monosaccharide in sweet fruits and honey that is soluble in water, alcohol, or ether. It is used as a preservative and an intravenous infusion in parenteral feeding.Crystallization: The formation of crystalline substances from solutions or melts. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Patents as Topic: Exclusive legal rights or privileges applied to inventions, plants, etc.Crystallography, X-Ray: The study of crystal structure using X-RAY DIFFRACTION techniques. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)X-Ray Diffraction: The scattering of x-rays by matter, especially crystals, with accompanying variation in intensity due to interference effects. Analysis of the crystal structure of materials is performed by passing x-rays through them and registering the diffraction image of the rays (CRYSTALLOGRAPHY, X-RAY). (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Chemistry, Organic: The study of the structure, preparation, properties, and reactions of carbon compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Acetylation: Formation of an acetyl derivative. (Stedman, 25th ed)Dictionaries, MedicalDictionaries as Topic: Lists of words, usually in alphabetical order, giving information about form, pronunciation, etymology, grammar, and meaning.Electronic Mail: Messages between computer users via COMPUTER COMMUNICATION NETWORKS. This feature duplicates most of the features of paper mail, such as forwarding, multiple copies, and attachments of images and other file types, but with a speed advantage. The term also refers to an individual message sent in this way.Food Dispensers, Automatic: Mechanical food dispensing machines.Editorial Policies: The guidelines and policy statements set forth by the editor(s) or editorial board of a publication.Authorship: The profession of writing. Also the identity of the writer as the creator of a literary production.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.Postal Service: The functions and activities carried out by the U.S. Postal Service, foreign postal services, and private postal services such as Federal Express.Internet: A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.Mutagenicity Tests: Tests of chemical substances and physical agents for mutagenic potential. They include microbial, insect, mammalian cell, and whole animal tests.Mutagens: Chemical agents that increase the rate of genetic mutation by interfering with the function of nucleic acids. A clastogen is a specific mutagen that causes breaks in chromosomes.Oenanthe: A plant genus of the family APIACEAE that is sometimes called Hemlock Water Dropwort but should not be confused with HEMLOCK. It contains enanthotoxin.Salmonella typhimurium: A serotype of Salmonella enterica that is a frequent agent of Salmonella gastroenteritis in humans. It also causes PARATYPHOID FEVER.

Activity in saline of phthalylated or succinylated derivatives of mycobacterial water-soluble adjuvant. (1/121)

A water-soluble fraction (WSA) of the cell wall can substitute for mycobacterial cells in Freund complete adjuvant. However, when WSA is administered in saline instead of in a water-in-oil emulsion, its adjuvant activity is very weak, and under certain experimental conditions it can even inhibit the humoral immune response. The data reported in the present study show that after treatment by phthalic or succinic anhydride the adjuvant activity of WSA was markedly changed, since high levels of circulating antibodies were produced when these derivatives were administered with an antigen in an aqueous medium. Moreover, the antigenic determinants of WSA were modified and acylated WSA had no tuberculin-like activity.  (+info)

Prevention of occupational allergy caused by exposure to acid anhydrides. (2/121)

This paper focuses on the prevention of IgE-mediated symptoms of the eyes and airways caused by exposure to acid anhydrides in the workplace. Acid anhydrides are widely used in the production of alkyd resins and as curing agents for epoxy resins. Heavy exposure to acid anhydrides causes severe irritation. However, reports of direct irritation of mucous membranes or skin are rare in recent years, since a package of multiple engineering controls has been introduced to reduce exposure. On the other hand, acid anhydrides are well-known industrial inhalant sensitizers and can cause occupational allergy even at very low exposure intensities. Therefore, safe use in industry demands both control of the level of exposure causing allergic diseases in the workshop and programmes for prevention of occupational allergy.  (+info)

Mass spectrometric analysis of platelet-activating factor after isolation by solid-phase extraction and direct derivatization with pentafluorobenzoic anhydride. (3/121)

Platelet-activating factor is the term used to denote a class of extremely potent lipid mediators that consist predominantly of 1-O-alkyl- and 1-O-acyl-2-acetyl-sn-glycero-3-phosphocholines. A method has been devised for rapid isolation of these acetylated phospholipids by solid-phase extraction prior to direct derivatization with pentafluorobenzoic anhydride and analysis by gas chromatography (GC)/electron-capture mass spectrometry. Recovery through the entire method (lipid isolation, derivatization, and purification) typically ranged from 70% to 85%. Using the direct derivatization procedure described here, the practical limit of detection for each of the standard alkyl- and acyl-platelet-activating factor homologs was 1 fmol injected into the GC. Results from the application of the method to the analysis of alkyl and acyl homologs of platelet-activating factor isolated from stimulated human umbilical vein endothelial cells are presented, exhibiting excellent accuracy and precision for a wide range of tissue levels of this class of potent autacoids.  (+info)

GCD quantitation of opiates as propionyl derivatives in blood. (4/121)

We describe a method using a gas chromatograph with electron ionization detection (GCD) for the simultaneous determination of morphine, codeine, 6-monoacetylmorphine, ethylmorphine, and dihydrocodeine in blood. The method employs propionic anhydride in the presence of triethylamine to propionylate free hydroxyl groups of the opiates in blood. The quantitation is achieved by using GCD with selected ion monitoring of the two most characteristic ions for each analyte. The quantitation limit was 0.01 mg/L and the linearity was 0.01-10 mg/L for dihydrocodeine, ethylmorphine, and 6-monoacetylmorphine. For the other investigated opiates, the quantitation limit was 0.025 mg/L and linearity was 0.025-10 mg/L. The intraday relative standard deviation (RSD) varied from 7.2 to 10% at the 0.5 mg/L level, and the day-to-day RSDs varied from 7.5 to 11% at the 0.85 mg/L level.  (+info)

Risk factors for bronchial hyperresponsiveness in workers exposed to acid anhydrides. (5/121)

Risk factors for bronchial hyperresponsiveness have previously been established in the general community. In settings where occupational asthma is a risk, it has not been established whether occupational sensitization or measures of exposure are important. Bronchial responsiveness to histamine was measured in a cohort of 506 workers exposed to acid anhydrides. Skin-prick tests were performed with conjugates of phthalic, maleic and trimellitic anhydride with human serum albumin and with common inhalant allergens. Employment and smoking histories were recorded. Occupational exposure was measured using personal air samplers and estimates of past exposure made by retrospective exposure assessment. Three hundred and seventy workers (73%) had bronchial responsiveness measured (median age 39 yrs, range 18-77) and 46 (12%) of these were hyperresponsive (provocative dose causing a 20% fall in forced expiratory volume in one second (FEV1; PD20) < or = 8 micromol). Twelve (3%) of these responsive workers had a skin-prick test reaction to an acid anhydride conjugate, 124 (34%) to a common inhalant allergen, and 148 (40%) were current smokers. Multivariate analysis showed that occupational sensitization, sensitization to a common inhalant allergen, age, and pack-years of smoking were independent risk factors for bronchial hyperresponsiveness. Of these only occupational sensitization was completely independent of baseline FEV1. It is concluded that sensitization to acid anhydrides is a significant risk factor for bronchial hyperresponsiveness. However, measures of personal acid anhydride exposure were not associated with bronchial hyperresponsiveness.  (+info)

New hemisynthetic manoyl oxide derivatives with antimicrobial activity. (6/121)

The synthesis and antimicrobial activity of ten labdane-type diterpenes derived from ent-3-beta-hydroxy-13-epi-manoyl oxide (ribenol) is reported. The chloroethyl carbamidic ester 9 showed the strongest antimicrobial activity against all the tested gram (+), gram (-) bacteria and pathogenic fungi. Moreover, the glycoside 11 exhibited an interesting activity against the three tested fungi.  (+info)

The chemical modification of alpha-chymotrypsin with both hydrophobic and hydrophilic compounds stabilizes the enzyme against denaturation in water-organic media. (7/121)

We considered alpha-chymotrypsin (CT) in homogeneous water-organic media as a model system to examine the influence of enzyme chemical modification with hydrophilic and hydrophobic substances on its stability, activity and structure. Both types of modifying agents may lead to considerable stabilization of the enzyme in water-ethanol and water-DMF mixtures: (i) the range of organic cosolvent concentration at which enzyme activity (Vm) is at least 100% of its initial value is broadened and (ii) the range of organic cosolvent concentration at which the residual enzyme activity is observed is increased. We found that for both types of modification the stabilization effect can be correlated with the changes in protein surface hydrophobicity/hydrophilicity brought about by the modification. Circular dichroism studies indicated that the effects of these two types of modification on CT structure and its behavior in water-ethanol mixtures are different. Differential scanning calorimetry studies revealed that after modification two or three fractions or domains, differing in their stability, can be resolved. The least stable fractions (or domains) have properties similar to native CT.  (+info)

Unmasking of histone amino groups in chromatin at high pH. (8/121)

The reactivity of the amino groups of histones in chromatin towards acetic anhydride was determined as a function of pH. In the pH range 7-10 the vast majority of amino groups in all five histones are buried. However, at higher pH values some of the histone amino groups become exposed, and the higher the lysine:arginine ratio for the histone the greater was the degree of unmasking observed. At pH 11.8 histone I appears to be completely dissociated, histones IIB1 and IIb2 have approx. 55% of the amino groups unmasked, and histones III and IV have approx. 25% of the amino groups unmasked.  (+info)

Patent US4489056 - Acid anhydrides as rate controlling agent for the erosion of polymers which ... - Google PatentsPatent US4489056 - Acid anhydrides as rate controlling agent for the erosion of polymers which ... - Google Patents
The invention relates to the use of an acid anhydride incorporated as a latentiated catalyst in poly(ortho ester) and other polymers such that upon exposure to aqueous environments the acid anhydride generates the corresponding acid which catalyzes the matrix erosion. The releasing rate of a loaded drug substance incorporated into or surrounded by the poly(ortho ester) or other polymers can be controlled in that the drug is released as the poly(ortho ester)s or other polymer is eroded by action of the acid anhydride incorporated therein.
Phenyl boronic acid anhydride (CAS 3262-89-3) Market Research Report 2018Phenyl boronic acid anhydride (CAS 3262-89-3) Market Research Report 2018
The report generally describes phenyl boronic acid anhydride, examines its uses, production methods, patents. Phenyl boronic acid anhydride market situation
Retrospective exposure assessment using Bayesian methods. - My...Retrospective exposure assessment using Bayesian methods. - My...
Retrospective exposure assessment using Bayesian methods.: This paper presents the application of a Bayesian framework for retrospective exposure assessment of
Chlorendic anhydride | Article about chlorendic anhydride by The Free DictionaryChlorendic anhydride | Article about chlorendic anhydride by The Free Dictionary
Looking for chlorendic anhydride? Find out information about chlorendic anhydride. C9H2Cl6O3 White, fine crystals used in fire-resistant polyester resins, in hardening epoxy resins, and as a chemical intermediate Explanation of chlorendic anhydride
Caprylic anhydride | Article about caprylic anhydride by The Free DictionaryCaprylic anhydride | Article about caprylic anhydride by The Free Dictionary
Looking for caprylic anhydride? Find out information about caprylic anhydride. 2O A white solid that melts at -1°C; used as a chemical intermediate Explanation of caprylic anhydride
CCCC 1989, Volume 54, Issue 10, Abstracts pp. 2738-2747 | Collection of Czechoslovak Chemical CommunicationsCCCC 1989, Volume 54, Issue 10, Abstracts pp. 2738-2747 | Collection of Czechoslovak Chemical Communications
Mixed anhydrides of O-benzylbenzohydroximic acid have been prepared by acylation and sulfonylation of O-benzylbenzohydroxamic acid using a variety of acyl and sulfonyl halides in the presence of trimethylamine and pyridine in dioxane and benzene. Structure elucidation of the resulting products was performed by chemical and spectroscopic methods. All evidences indicate that the products have the mixed anhydride structure with (Z)-configuration. Corresponding (E)-isomer and the isomeric N-acylated or sulfonylated products, if formed, could not be isolated. Several mixed anhydrides showed antiparasitic activity.. ...
Synthesis and Characterization of Bis(trifluoromethyl)thiophosphinic Acid and Its Anhydride,Synthesis and Characterization of Bis(trifluoromethyl)thiophosphinic Acid and Its Anhydride,
Bis(trifluoromethyl)thiophosphinic acid, (CF3)2P(S)OH, has been prepared by the reaction of concentrated sulfuric acid with salts of the acid. The new moderately strong monothio acid is stable in aqueous solution but yields 1 mol of CF3H per mole of acid upon alkaline hydrolysis. The acid has been characterized by chemical and spectroscopic methods including gas-phase infrared spectra which suggest that the acid has the (CF3)2P(S)OH structure. Dehydration of the acid with P4O10 proceeds smoothly to give good yields of the anhydride, ((CF3)2P(S))2O, which is extremely inert toward electrophilic reagents such as hydrogen halides and hydrogen sulfide. The infrared and nmr spectral properties of the acid and its anhydride are discussed. The anhydrides reactions are also discussed.(*ORGANIC PHOSPHORUS COMPOUNDS
2-DECEN-1-YLSUCCINIC ANHYDRIDE 25447-83-0 Precursor & Downstream Compound Dictionary2-DECEN-1-YLSUCCINIC ANHYDRIDE 25447-83-0 Precursor & Downstream Compound Dictionary
2-DECEN-1-YLSUCCINIC ANHYDRIDE 25447-83-0 Precursor and Downstream products, 2-DECEN-1-YLSUCCINIC ANHYDRIDE Precursor products, 2-DECEN-1-YLSUCCINIC ANHYDRIDE Downstream products ect.
5-Fluoroisatoic Anhydride 321-69-7 H-NMR | C-NMR Spectral Analysis NMR Spectrum5-Fluoroisatoic Anhydride 321-69-7 H-NMR | C-NMR Spectral Analysis NMR Spectrum
5-Fluoroisatoic Anhydride 321-69-7 NMR spectrum, 5-Fluoroisatoic Anhydride H-NMR spectral analysis, 5-Fluoroisatoic Anhydride C-NMR spectral analysis ect.
Ocular and airway symptoms related to organic acid anhydride exposure--a prospective study. - PubMed - NCBIOcular and airway symptoms related to organic acid anhydride exposure--a prospective study. - PubMed - NCBI
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%, ACROS Organics™ 5g; Glass bottle cis-5-Norbornene-exo-2,3-dicarboxylic...cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%, ACROS Organics™ 5g; Glass bottle cis-5-Norbornene-exo-2,3-dicarboxylic...
cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%, ACROS Organics™ 5g; Glass bottle cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%, ACROS...
Brevet US4975474 - Multi-component coating composition comprising an anhydride containing ... - Google BrevetsBrevet US4975474 - Multi-component coating composition comprising an anhydride containing ... - Google Brevets
A coating composition useful for a finish for automobiles and trucks in which the film forming binder contains reactive binder components of about (a) 25-94% by weight, based on the weight of the binder, of an acrylic polymer having at least two reactive anhydride groups composed of polymerized monomers of an ethylenically unsaturated anhydride and polymerized monomers from the group consisting of alkyl methacrylate, alkyl acrylate and any mixtures thereof, wherein the alkyl groups have 1-8 carbon atoms and the polymer has a weight average molecular weight of about 2,000-50,000; (b) 5-50% by weight, based on the weight of the binder, of a glycidyl component having at least two reactive glycidyl groups; (c) 1-40% by weight, based on the weight of the binder, of a self-stabilized dispersed resin; and the composition contains about 0.1-5% by weight; based on the weight of the binder, of a catalyst.
CAS 4124-31-6 : TRICHLOROACETIC ANHYDRIDECAS 4124-31-6 : TRICHLOROACETIC ANHYDRIDE
4124-31-6 Trichloroacetic anhydride testing. Laboratory testing for CAS number 4124-31-6. Trichloroacetic anhydride. This chemical is colourless liquid
Anhydride AceticAnhydride Acetic
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2016 Tetrahydrophthalic anhydride (THPA) (CAS 935-79-5) Industry Market Report : ReportsnReports2016 Tetrahydrophthalic anhydride (THPA) (CAS 935-79-5) Industry Market Report : ReportsnReports
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poly(iso-butylene-alt-maleic anhydride/succinic amides)-coated dodecanethiol-stabilized gold nanoparticles in TBE bufferpoly(iso-butylene-alt-maleic anhydride/succinic amides)-coated dodecanethiol-stabilized gold nanoparticles in TBE buffer
Page contains details about poly(iso-butylene-alt-maleic anhydride/succinic amides)-coated dodecanethiol-stabilized gold nanoparticles in TBE buffer . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Statistical Process Optimization of poly(bis(2-hydroxyl ethyl) terephthalate-Maleic Anhydride)from PETStatistical Process Optimization of poly(bis(2-hydroxyl ethyl) terephthalate-Maleic Anhydride)from PET
نسخه قابل چاپ خلاصه مقاله Statistical Process Optimization of poly(bis(2-hydroxyl ethyl) terephthalate-Maleic Anhydride)from PET - گواهی پذیرش مقاله در کنفرانس
4-Thiazoleacetic acid,alpha-[(acetyloxy)imino]-2-amino-,anhydride with diethyl hydrogen phosphate,(Z)- - Alfa Chemistry4-Thiazoleacetic acid,alpha-[(acetyloxy)imino]-2-amino-,anhydride with diethyl hydrogen phosphate,(Z)- - Alfa Chemistry
4-Thiazoleacetic acid,alpha-[(acetyloxy)imino]-2-amino-,anhydride with diethyl hydrogen phosphate,(Z)-/ACM205307524 can be provided in Alfa Chemistry. We are dedicated to provide our customers the best products and services.
Effect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites - DROEffect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites - DRO
Joosten, Mathew W., Agius, Steven, Hilditch, Tim and Wang, Chun 2017, Effect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites, Composites part A: applied science and manufacturing, vol. 101, pp. 521-528, doi: 10.1016/j.compositesa.2017.07.007. ...
Allergy Pthalic Anhydride Fluorescence Assay Skin - Preparation, Procedure, Cost, Normal Range | PractoAllergy Pthalic Anhydride Fluorescence Assay Skin - Preparation, Procedure, Cost, Normal Range | Practo
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Dissolution of paracetamol crystallized in the presence of poly(vinyl acetate-co-maleic anhydride)Dissolution of paracetamol crystallized in the presence of poly(vinyl acetate-co-maleic anhydride)
... , DA Raval, DN Parikh, VM Patel
What is an example of a basic anhydride? | Reference.comWhat is an example of a basic anhydride? | Reference.com
All metallic oxides that react with water to form a base solution are considered basic anhydrides, including lithium, magnesium, sodium and calcium oxides. Only the oxides formed by the alkali metals...
R)-(+)-2-Acetoxysuccinic anhydride 96% | Sigma-AldrichR)-(+)-2-Acetoxysuccinic anhydride 96% | Sigma-Aldrich
Sigma-Aldrich offers Aldrich-441570, (R)-(+)-2-Acetoxysuccinic anhydride for your research needs. Find product specific information including CAS, MSDS, protocols and references.
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The catalytic effect of acetic acid-water solutions on the rate of racemisation of 1-trans-α,ɣ-dimethylglutaconic acidThe catalytic effect of acetic acid-water solutions on the rate of racemisation of 1-trans-α,ɣ-dimethylglutaconic acid
The glutaconic acids are substances possessing a highly mobile three carbon tautomeric system. They also exhibit geometrical isomerism and, in the case of the symmetrically di-substituted acids, optical isomerism as well. Glutaconic acid has the trans configuration, but readily yields an anhydride which on careful hydration forms the unstable cis-acid (Malachowski, Ber., 1929, 62, (B) 1323). This is explained by the high mobility of the system which results in isomerisation from the trans to the cis form as a preliminary step in anhydride formation. ...
Composition for forming underlayer coating for litography containing epoxy compound and carboxylic acid compound - Patent #...Composition for forming underlayer coating for litography containing epoxy compound and carboxylic acid compound - Patent #...
There is provided an underlayer coating forming composition for lithography that is used in lithography process of manufacture of semiconductor device; and an underlayer coating having a high dry etching rate compared with photoresist. Concretely, it is a composition for forming an underlayer without use of crosslinking reaction by an strong acid catalyst, and an underlayer coating forming composition containing a component having an epoxy group (a polymer, a compound) and a component having a phenolic hydroxyl group, a carboxyl group, a protected carboxyl group or an acid anhydride structure (a polymer, a compound).
Opération naphtaline - Lea libros, audiolibros y mucho másOpération naphtaline - Lea libros, audiolibros y mucho más
English Translation of "naphtaline" , Collins French-English ... English Translation of "naphtaline" , The official Collins French-English Dictionary online. Over 100,000 English translations of French words and phrases. Define mothball. mothball synonyms, mothball pronunciation, mothball translation, English dictionary definition of mothball. ... etc) out of operation but maintain it ... Fujifilm Instax Mini 9 User Manual Have a look at the manual Fujifilm Instax Mini 9 User Manual online for free. Its possible to download the document as PDF or print. UserManuals.tech offer 17 Fujifilm manuals and users guides for free. US3507810A - Catalyst for oxidation of naphthalene to ... US3507810A - Catalyst for oxidation of naphthalene to phthalic acid anhydride - Google Patents. durée : 00:05:44 - Tanguy Pastureau maltraite linfo - par : Tanguy Pastureau - Les sondages de France Inter sont exceptionnels, 6 millions de gens écoutent cette radio tous les jours, 120 millions selon la CGT Radio ...
AtREG586AtREG586
vacuolar ATP synthase subunit B, putative / V-ATPase B subunit, putative / vacuolar proton pump B subunit, putative / V-ATPase 57 kDa subunit, putative; FUNCTIONS IN: hydrogen ion transporting ATP synthase activity, rotational mechanism, hydrolase activity, acting on acid anhydrides, catalyzing transmembrane movement of substances, proton-transporting ATPase activity, rotational mechanism; INVOLVED IN: proton transport, ATP metabolic process, ATP synthesis coupled proton transport; LOCATED IN: plasma membrane, vacuole, membrane, chloroplast envelope; EXPRESSED IN: 27 plant structures; EXPRESSED DURING: 15 growth stages; CONTAINS InterPro DOMAIN/s: ATPase, F1/V1/A1 complex, alpha/beta subunit, C-terminal (InterPro:IPR000793), ATPase, F1/V1/A1 complex, alpha/beta subunit, N-terminal (InterPro:IPR004100), ATPase, F1/V1/A1 complex, alpha/beta subunit, nucleotide-binding (InterPro:IPR000194), ATPase, V1 complex, subunit B (InterPro:IPR005723); BEST Arabidopsis thaliana protein match is: vacuolar ATP ...
Plus itPlus it
CGS 27830 [meso-1,4-dihydro-5-methoxycarbonyl-2,6-dimethyl-4-(3- nitrophenyl)-3-pyridine carboxylic acid anhydride] is a nonpeptidic, insurmountable, endothelin (ET) receptor antagonist with approximately 10- to 20-fold selectivity for ETA receptors. CGS 27830 exhibits unusual binding properties which depend on the receptor and ligand: standard saturation binding experiments (coincubation of membranes with ligand in the absence or presence of antagonist) suggest that CGS 27830 is a competitive inhibitor of [125I]IRL 1620 binding to ETB receptors in rat cerebellar membranes (i.e., there was a change of apparent Kd with no change of maximum binding), but a noncompetitive inhibitor of [125I]IRL 1620 binding to ETB receptors in rat lung membranes (i.e., significant loss of total binding was observed). Although the antagonist appears to be a noncompetitive inhibitor of [125I]IRL 1620 binding to ETB receptors in rat lung membranes, CGS 27830 appears to be a competitive inhibitor of [125I]ET-1 binding ...
China Customized OEM n-(4-bromo-phenyl)-benzene-1,2-diamine Factory Produce QuotesChina Customized OEM n-(4-bromo-phenyl)-benzene-1,2-diamine Factory Produce Quotes
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Steroid-bovine serum albumin conjugates: molecular characterization and their interaction with androgen and estrogen receptors....Steroid-bovine serum albumin conjugates: molecular characterization and their interaction with androgen and estrogen receptors....
Conjugates of testosterone-3-carboxymethyloxime (T-3-CMO), testosterone-17-hemisuccinate (T-17-HS), 17 beta-estradiol-6-carboxymethyloxime (E-6-CMO), or 17 beta-estradiol-17-hemisuccinate (E-17-HS) and bovine serum albumin (BSA) with varying steroid:protein ratios were prepared using the mixed anhydride method. Dialysis followed by molecular filtration yielded monomer steroid-BSA conjugates with a molecular weight of 70,000 dalton, and polymer conjugates with molecular weights of 140,000 dalton and higher. When conjugates were prepared with increasing initial steroid:BSA molar ratios the ratio of the obtained conjugates increased, in parallel with a decrease in the relative amount of monomers and an increase in the mean molecular size of polymers. The molecular properties of these conjugates were studied further by polyacrylamide gel electrophoresis (PAGE) in native and denaturing conditions. In native PAGE the monomer fractions showed one main band with a mobility slightly lower than BSA and a faint
GästebuchGästebuch
alternative to amitriptyline for ibs Pfleiderâ  s revised total debt of $1,098.87 was less than the $1,533 the Treasury had already collected from him on behalf of DFAS. After accounting for other, smaller underpayments to Pfleider, as well as interest and penalties, DFAS said his final total debt came to $815.50 â  or only about 25 percent of what it had claimed when it started sending bills to him. DFAS deducted that from the $1,533 it already had collected and in mid-April, a month after Reuters inquired about his case, paid him the balance of $717.50 ...
Diglycerol-based polyesters: melt polymerization with hydrophobic anhydrides. | Sigma-AldrichDiglycerol-based polyesters: melt polymerization with hydrophobic anhydrides. | Sigma-Aldrich
Sigma-Aldrich offers abstracts and full-text articles by [Deivasagayam Dakshinamoorthy, Allison K Weinstock, Krishnan Damodaran, David F Iwig, Robert T Mathers].
Relative Stability of Amides Esters Anhydrides and Acyl Chlorides | 有機化學 | 均一教育平台Relative Stability of Amides Esters Anhydrides and Acyl Chlorides | 有機化學 | 均一教育平台
I want to make a quick correction to the last video where we introduced the carboxylic acid videos, and then we can actually compare them in terms of
Acetic acid, anhydride, reaction products with... - PBT assessment list - ECHAAcetic acid, anhydride, reaction products with... - PBT assessment list - ECHA
For REACH substances, inclusion in the list means that an informal hazard assessment for PBT/vPvB properties either is under development or has been completed since the start of the implementation of the SVHC Roadmap in February 2013. For each substance, the table shows the assessing or evaluating Member State (submitter), the outcome and the suggested follow-up from the assessment, and the date of the latest update to the list entry. Other process details and hazard assessment outcome documents are also available and can be accessed through the Details icon. One possible outcome of such an assessment is that a substance is considered not to have PBT/vPvB properties. If the outcome is that the substance is considered to have PBT/vPvB properties, confirmation through the formal risk management and decision-making processes under REACH/BPR is needed before any regulatory action can be taken due to these properties. The intentions of authorities to submit a dossier to the formal REACH and CLP ...
3,6-dichlorophthalic anhydride anion3,6-dichlorophthalic anhydride anion
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database ...
Benzoic Anhydride - Creative ProteomicsBenzoic Anhydride - Creative Proteomics
Please submit a detailed description of your project. We will provide you with a customized project plan to meet your research requests. You can also send emails directly to for inquiries. ...
Succinic anhydride - Registration Dossier - ECHASuccinic anhydride - Registration Dossier - ECHA
Succinic anhydride can be expected to have a low potential for bioaccumulation (due to low log Pow). Information regarding the toxicokinetics and percutaneous absorption of cyclic anhydrides is available in the published literature. Toxicokinetics data on hexahydrophthalic anhydride and phthalic anhydride indicate that cyclic anhydrides are readily hydrolysed to the corresponding dicarboxylic acid, which is mainly excreted in the urine and to a lesser extent in expired air after exposure via the inhalation route. Cyclic anhydrides share structural and physicochemical properties such that following inhalation exposure. The hydrolysis product of succinic anhydride is succinic acid, an endogenous substance and food ingredient that is expected to be effectively excreted in urine. A separate toxicokinetics study on succinic anhydride is not proposed and cannot be justified based upon animal welfare considerations. Percutaneous absorption of cyclic anhydrides was investigated using hexahydrophthalic ...
Human Metabolome Database: Showing metabocard for Acetic anhydride (HMDB0031646)Human Metabolome Database: Showing metabocard for Acetic anhydride (HMDB0031646)
Acetic anhydride is an esterification agent for use in prepn. of modified food starch and for acetylation of monoglycerides Acetic anhydride is a versatile reagent for acetylations, the introduction of acetyl groups to organic substrates. In these conversions, acetic anhydride is viewed as a source of CH3CO+. Alcohols and amines are readily acetylated. For example, the reaction of acetic anhydride with ethanol yields ethyl acetate: (CH3CO)2O + CH3CH2OH → CH3CO2CH2CH3 + CH3COOH. Acetic anhydride is an irritant and flammable. Because of its reactivity toward water, alcohol foam or carbon dioxide are preferred for fire suppression. The vapour of acetic anhydride is harmful. Acetic anhydride is the chemical compound with the formula (CH3CO)2O. Commonly abbreviated Ac2O, it is one of the simplest acid anhydrides and is a widely used reagent in organic synthesis. It is a colorless liquid that smells strongly of acetic acid, which is formed by its reaction with the moisture in the air. As indicated ...
Succinic anhydride - Registration Dossier - ECHASuccinic anhydride - Registration Dossier - ECHA
The single dose oral toxicity of succinic anhydride in Sprague-Dawley rats was reported as 1794.9 mg/kg bw for males and females. The acute dermal median lethal dose for succinic anhydride was found to exceed the limit dose level in rats, ,2000 mg/kg bw. Clinical signs included reduced appetite and activity, increasing weakness, collapse and death inalbino rabbits following acute dermal administration of maleic anhydride. The LD50 is between 1600 and 2600 mg/kg/day. Macroscopic evaluation showed enlarged gall bladder, discoloration of spleen and kidneys, and gastrointestinal inflammation. Similar results would be expected with succinic anhydride Acute inhalation testing is not required. The results of the granulometry indicate the L10 value for particle size was 377 µm and the L50 was greater than 1100 µm. On the basis of these results only a very small part of the particles in the batch of succinic anhydride may be smaller than 100 µm and may be respirable. The lager part of the particles ...
Formation of citraconic anhydride via condensation of dialkyl succinates and formaldehyde<...Formation of citraconic anhydride via condensation of dialkyl succinates and formaldehyde<...
TY - JOUR. T1 - Formation of citraconic anhydride via condensation of dialkyl succinates and formaldehyde. AU - Shekhawat,Dushyant. AU - Nagarajan,Kirthivasan. AU - Jackson,James E.. AU - Miller,Dennis J.. PY - 2002. Y1 - 2002. N2 - The formation of citraconic anhydride (CAN) from the condensation of succinic acid and its derivatives with formaldehyde over oxide catalysts is described. Alumina and aluminum phosphate are active catalysts that give selectivity to citraconic anhydride as high as 75% in an integral fixed bed reactor. Weakly acidic sites on the catalyst surface, particularly Lewis acid sites, are responsible for activating the desired reaction pathway. Strongly acidic sites lead to cracking and coking, while basic sites facilitate the Cannizzaro reaction of formaldehyde to carbon dioxide and methanol. Catalyst deactivation via coking occurs over the course of reaction, but activity is easily restored by regeneration in air at elevated temperatures. The reaction system under ...
Acetic anhydride - definition of acetic anhydride by The Free DictionaryAcetic anhydride - definition of acetic anhydride by The Free Dictionary
Define acetic anhydride. acetic anhydride synonyms, acetic anhydride pronunciation, acetic anhydride translation, English dictionary definition of acetic anhydride. n a colourless pungent liquid used in the manufacture of cellulose and vinyl acetates for synthetic fabrics. Formula: 2O n. a colorless, pungent liquid,...
World Acetic Anhydride Market: Opportunities and Forecasts, 2014 - 2020World Acetic Anhydride Market: Opportunities and Forecasts, 2014 - 2020
Acetic anhydride, is a colorless liquid, primarily used in the manufacturing of cellulose acetate. Cellulose acetate is used in production of several products, such as cigarette filters, textile fibers and plastic goods. In addition, acetic anhydride is used for production or manufacturing of resins & polymers, artificial sweeteners, TAED, explosives, agrochemicals, coating materials and others. Acetic anhydride is used to manufacture tetraacetylethylenediamine (TAED), which is utilized as a bleach activator in laundry and cleaning industry. Similarly, acetic anhydride, in addition to its several other applications, is used often in the form of derivatives or sources, amongst which cellulose acetate is the most widely used derivative.. Cigarette filters, occupy the largest share in volume, since their tar and nicotine removal rate goes up to 50%, higher than other compounds such as phenols. Thus, cellulose acetate contributes to more than half of the world acetic anhydride market. The demand for ...
Wholesale Acetic Anhydride - Acetic Anhydride Manufacturers, Suppliers - EC21Wholesale Acetic Anhydride - Acetic Anhydride Manufacturers, Suppliers - EC21
Wholesale Acetic Anhydride ☆ Find 73 acetic anhydride products from 46 manufacturers & suppliers at EC21. ☆ Choose quality acetic anhydride manufacturers, suppliers & exporters now - EC21
Possibilities of the application of polyisobutenyl succinic anhydride derivatives of various molecular structures<...Possibilities of the application of polyisobutenyl succinic anhydride derivatives of various molecular structures<...
TY - JOUR. T1 - Possibilities of the application of polyisobutenyl succinic anhydride derivatives of various molecular structures. AU - Kocsis, Z.. AU - Baladincz, J.. AU - Bartha, L.. AU - Hancsók, J.. PY - 2001/12/1. Y1 - 2001/12/1. N2 - Detergent-dispersant (DD) effect is one of the most important properties of lubricants and fuels. To ensure these properties various types of additives are used in increasing amount in the performance additive packages. Among them ashless types and mostly polyalkenyl succinic anhydride derivatives are applied in high volumes. In this paper the main advantages of the ashless additives are presented showing the dependence of their properties on the molecule structure (monosuccinimides, bissuccinimides, mixtures thereof and polysuccinimide). Additionally, the interactions with other additives are shown which can determine the main tribological properties of the lubricants.. AB - Detergent-dispersant (DD) effect is one of the most important properties of ...
Reversible acylation and inhibition of aggregation of platelets by substituted maleic anhydrides<...Reversible acylation and inhibition of aggregation of platelets by substituted maleic anhydrides<...
TY - JOUR. T1 - Reversible acylation and inhibition of aggregation of platelets by substituted maleic anhydrides. AU - Walder, J. A.. AU - Hyman, B. T.. AU - Heller, Michael (Mike). AU - Shishido, R. Y.. AU - Klotz, I. M.. PY - 1977/12/1. Y1 - 1977/12/1. N2 - The antiprostaglandin action of aspirin due to the acetylation of the enzyme prostaglandin synthetase is manifested by inhibition of the so-called release reaction and consequent abolition of secondary-phase aggregation. The maleic anhydrides, a series of reversible acylating agents, have now been shown to produce the aspirin-type defect in platelet aggregation. The antiplatelet effect of aspirin is irreversible. With 2,3-dimethylmaleic anhydride, however, the antiplatelet effect disappeared in approximately 80 min at 25°. Hence the persistence of the lesion when caused by aspirin results from the stability of the acetyl linkage formed in its reaction with prostaglandin synthetase. This suggests that the modification occurs at either a ...
Global Maleic Anhydride Market 2016 Industry Analysis & Forecast 2024Global Maleic Anhydride Market 2016 Industry Analysis & Forecast 2024
Maleic anhydride is the organic compound which is the maleic acids acid anhydride. It is produced in large quantities for the coatings and polymers applications.
Acetic anhydride - WikipediaAcetic anhydride - Wikipedia
As indicated by its organic chemistry, Acetic anhydride is mainly used for acetylations leading to commercially significant materials. Its largest application is for the conversion of cellulose to cellulose acetate, which is a component of photographic film and other coated materials, and is used in the manufacture of cigarette filters. Similarly it is used in the production of aspirin (acetylsalicylic acid), which is prepared by the acetylation of salicylic acid.[19] It is also used as a wood preservative via autoclave impregnation to make a longer-lasting timber. In starch industry, acetic anhydride is a common acetylation compound, used for the production of modified starches (E1414, E1420, E1422) Because of its use for the synthesis of heroin by the diacetylation of morphine, acetic anhydride is listed as a U.S. DEA List II precursor, and restricted in many other countries.[20]. ...
Sciencemadness Discussion Board - Acetic anhydride preparation - Powered by XMB 1.9.11Sciencemadness Discussion Board - Acetic anhydride preparation - Powered by XMB 1.9.11
Im not sure, but I think that its possible that I prepared acetic anhydride by accident today. I mixed 164g CH3COONa (contaminated with a small amount of NaHCO3, around 1-2g) with 75g 94% H2SO4. I then poured that into a flask; began heating it, and condensing the vapors (typical distillation). I noticed a very strange, sickly-sweet odor; very difficult to describe. I got a whiff of a very small amount of it, causing me to choke for a few moments. The condensed liquid (which I got 22mL of, if I remember correctly) was still liquid, showing no signs of imminent freezing, at -10C. Now, if that had been acetic acid, it would have frozen at a far higher temperature than that... acetic anhydride, on the other hand, would not freeze until the temperature was FAR lower. Im postulating that the following reactions were occuring, forming at least a fair-sized quantity of acetic anhydride (there is probably a significant amount of acetic acid remaining). Keep in mind that there was a slight ...
OrganismsChemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentPhenomena and ProcessesDisciplines and OccupationsAnthropology, Education, Sociology and Social PhenomenaTechnology, Industry, AgricultureInformation ScienceHealth Care
AnhydridesAcetic AnhydridesPhthalic AnhydridesMaleic AnhydridesSuccinic AnhydridesCitraconic AnhydridesEpoxy ResinsFluoroacetatesAconitic AcidMaleatesDiethyl PyrocarbonateDisaccharidesTrifluoroacetic AcidPhthalic AcidsPyran CopolymerChemistryCoenzyme A-TransferasesChemical PhenomenaGas Chromatography-Mass SpectrometryFuransRutamycinNorbornanesRuminococcusAcylationBenzene DerivativesMolecular StructureSuccinatesMercaptoethylaminesIndicators and ReagentsFormatesMetals, Rare EarthMaleic HydrazideMetals, Alkaline EarthFructoseCrystallizationPatents as TopicCrystallography, X-RayX-Ray DiffractionEncyclopedias as TopicChemistry, OrganicAcetylationDictionaries, MedicalDictionaries as TopicElectronic MailFood Dispensers, AutomaticEditorial PoliciesAuthorshipPeriodicals as TopicPostal ServiceInternetMutagenicity TestsMutagensOenantheSalmonella typhimurium
Acyl halideAcyl halide
carboxylic acids to form an organic acid anhydrides. In the above reactions, HX (hydrogen halide or hydrohalic acid) is also ... Allen, C. F. H.; Kibler, C. J.; McLachlin, D. M.; Wilson, C. V. (1946). "Acid Anhydrides". Organic Syntheses. 26: 1. doi: ...
Phenylboronic acidPhenylboronic acid
The dehydration of boronic acids gives boroxines, the trimeric anhydrides of phenylboronic acid. The dehydration reaction is ... ISBN 3-527-30991-8 Washburn, RM; Levens, E; Albright, CF; Billig, FA (1963). "Benzeneboronic anhydride". Organic Syntheses. ; ...
Succinic acidSuccinic acid
Dehydration of succinic acid gives succinic anhydride. Succinate can be used to derive 1,4-butanediol, maleic anhydride, ... Louis F. Fieser; E. L. Martin; R. L. Shriner; H. C. Struck (1932). "Succinic Anhydride". Organic Syntheses. 12: 66. ; ... Succinate is also produced petrochemically from butane via maleic anhydride. Additionally, genetic engineering of ...
Boronic acidBoronic acid
In the second step the hydroxyl group is activated as a leaving group by conversion to a triflate by triflic anhydride aided by ... They are prone to forming anhydrides by loss of water molecules, typically to give cyclic trimers. Boronic acids can be ... Phenylboronic acid can be selfcondensed to the cyclic trimer called triphenyl anhydride or triphenylboroxin. Compounds with 5- ... "Benzeneboronic anhydride". Organic Syntheses. 39: 3. ; Collective Volume, 4, p. 68 Copper promoted C-N and C-O bond cross- ...
BenzotriyneBenzotriyne
There have been a few attempts to synthesize benzotriyne, e.g. by pyrolysis of mellitic anhydride, but without success as of ... Ellis K. Fields, Seymour Meyerson (October 1966). "Arynes by Pyrolysis of Acid Anhydrides". J. Org. Chem. 31 (10): 3307-3309. ...
Kathryn UhrichKathryn Uhrich
Polyaspirine consists of anhydrides and esters that hydrolytically degrade into the active ingredient in aspirin (salicylic ... 2013). Anhydrides-Advances in Research and Application. ISBN 9781481697163. Goldberg, Daniel R. (2009). "Aspirin: Turn of the ... Rosenberg, L.E.; Carbone, A.L.; Römling, U.; Uhrich, K.E.; Chikindas, M.L. (May 2008). "Salicylic acid-based poly(anhydride ... These polymers consist of esters, amides and anhydrides, all of which are susceptible to hydrolysis, thus ensuring the ...
Anthranilic acidAnthranilic acid
1947). "Isatoic anhydride". Org. Synth. 27: 45. doi:10.15227/orgsyn.027.0045. CS1 maint: Uses authors parameter (link) Edward R ... Industrially it is produced from phthalic anhydride, beginning with amination: C6H4(CO)2O + NH3 + NaOH → C6H4(C(O)NH2)CO2Na + ... It reacts with phosgene to give isatoic anhydride, a versatile reagent. Chlorination of anthranilic acid gives the 2,4-dichloro ...
P-Toluenesulfonic acidP-Toluenesulfonic acid
TsOH may be converted to p-toluenesulfonic anhydride by heating with phosphorus pentoxide. When TsOH is heated with acid and ... "p-Toluenesulfonic Anhydride". Organic Syntheses. ; Collective Volume, 4, p. 940 C. M. Suter (1944). The Organic Chemistry of ...
Michael reactionMichael reaction
Vol., 2, p. 200 James Cason (1963). "β-Methylglutaric anhydride". Org. Synth. ; Coll. Vol., 4, p. 630 Moffett, R. B. (1963). " ...
Alkyl ketene dimerAlkyl ketene dimer
Related to AKDs, is alkenylsuccinic anhydride (ASA). As for AKDs, ASA reacts with hydroxy groups of the cellulose to form an ... ASA is prepared by the ene reaction of unsaturated hydrocarbons with maleic anhydride. As early as 1901, Edgar Wedekind ... In addition to the significantly more reactive alkenylsuccinic anhydrides (which do also hydrolyze rapidly in the presence of ... doi:10.1002/14356007.o18_o11 Gess, Jerome; Rend, Dominic (2005). "Alkenyl Succinic Anhydride (ASA)". Tappi Journal. 4: 25-30. E ...
Levan fructotransferase (DFA-IV-forming)Levan fructotransferase (DFA-IV-forming)
Saito K, Tomita F (2000). "Difructose anhydrides: their mass-production and physiological functions". Biosci. Biotechnol. ... "Characteristics of levan fructotransferase from Arthrobacter ureafaciens K2032 and difructose anhydride IV formation from levan ...
Barton-McCombie deoxygenationBarton-McCombie deoxygenation
Forbes, J.E.; Zard, S.Z. (January 1989). "A novel radical chain reaction of xanthic anhydrides. Further observations on the ...
Curtius rearrangementCurtius rearrangement
Kaiser, C.; Weinstock, J. (1988). "Amines from mixed carboxylic-carbonic anhydrides: 1-phenylcyclopentylamine". Organic ...
Monobasic acidMonobasic acid
Acylation by Monobasic Acid Anhydrides Potassium Phosphate Monobasic. ...
Citraconic acidCitraconic acid
The acid displays the unusual property of spontaneously forming the anhydride, which, unlike maleic anhydride, is a liquid at ... In the laboratory, citraconic acid can be produced by heating, itaconic acid anhydride to give citraconic acid anhydride, which ... The required itaconic acid anhydride is obtained by dry distillation of citric acid. Budavari, Susan, ed. (1996), The Merck ... "Citraconic Anhydride and Citraconic Acid". Org. Synth. 28: 28. doi:10.15227/orgsyn.011.0028. ...
Itaconic acidItaconic acid
Upon heating, itaconic anhydride isomerizes to citraconic acid anhydride, which can be hydrolyzed to citraconic acid (2- ... R. L. Shriner; S. G. Ford; l. J. Roll (1931). "Citraconic Anhydride and Citraconic Acid". Org. Synth. 28: 28. doi:10.15227/ ... Dry distillation of citric acid affords itaconic anhydride, which readily undergoes hydrolysis to itaconic acid. ... "Itaconic anhydride and itaconic acid". Org. Synth. 11: 70. doi:10.15227/orgsyn.011.0070. ...
DeoxygenationDeoxygenation
Trifluoroacetic anhydride-sodium iodide reagent. Nature and applications Arkivoc 2007 (JE-2136MR) Zbigniew H. Kudzin, Marcin H ... A chemical reagent for the deoxygenation of many sulfur and nitrogen oxo compounds is the combination trifluoroacetic anhydride ...
Carbonyl groupCarbonyl group
For example, R(CO)O(CO)R' structures are known as acid anhydride rather than the more generic ester, even though the ester ... Acyl chlorides and carboxylic anhydrides react fastest, followed by aldehydes and ketones. Esters react much more slowly and ...
KetoneKetone
By decarboxylation of carboxylic anhydride. Ketones can be prepared from haloketones in reductive dehalogenation of halo ...
RTI-274RTI-274
... trifluoromethanesulfonic anhydride, pyridine, CH2Cl2; (e) Na, sesamol, THF; (f) 5% Na/Hg amalgam, Na2HPO4, MeOH. To solve the ...
Pummerer rearrangementPummerer rearrangement
Common activators besides acetic anhydride are trifluoroacetic anhydride and trifluoromethanesulfonic anhydride. Common ... This reaction type is demonstrated below with a set of sulfoxides and trifluoroacetic anhydride (TFAA): The organic group "R2" ... Other anhydrides and acyl halides can give similar products. Inorganic acids can also give this reaction.This product can be ... is an organic reaction whereby an alkyl sulfoxide rearranges to an α-acyloxy-thioether in the presence of acetic anhydride. In ...
Dicarboxylic acidDicarboxylic acid
... and anhydrides. In the case of anhydrides or amides, two of the carboxyl groups can come together to form a cyclic compound, ... or dehydrating it with acetic anhydride will yield a cyclic acid anhydride if the carbon atoms bearing acid groups are in ... position 1 and (3,4 or 5). So succinic acid will yield succinic anhydride. For acids with carboxylic groups at position 1 and 6 ...
Nucleophilic acyl substitutionNucleophilic acyl substitution
While anhydrides cannot be converted to acid halides, they can be converted to the remaining acyl derivatives. Anhydrides also ... Unlike acid halides, however, anhydrides do not react with Gilman reagents. The reactivity of anhydrides can be increased by ... and water can hydrolyze anhydrides to their corresponding acids. As with acid halides, anhydrides can also react with carbon ... Reaction of acetic anhydride with acetone in Organic Syntheses Coll. Vol. 3, p. 16; Vol. 20, p. 6 Article. ...
Friedel-Crafts reactionFriedel-Crafts reaction
In it benzene is reacted with succinic anhydride, the intermediate product is reduced and a second FC acylation takes place ... In a related reaction, phenanthrene is synthesized from naphthalene and succinic anhydride in a series of steps. Reaction of ... 80, p. 227 Link Reaction of bromobenzene with acetic anhydride Organic Syntheses, Coll. Vol. 1, p. 109 (1941); Vol. 5, p. 17 ( ... Examples are the synthesis of thymolphthalein (a pH indicator) from two equivalents of thymol and phthalic anhydride: A ...
OxoacidOxoacid
When oxoacids are heated, many of them dissociate to water and the anhydride of the acid. In most cases, such anhydrides are ... For example, carbon dioxide, CO2, is the anhydride of carbonic acid, H2CO3, and sulfur trioxide, SO3, is the anhydride of ... These anhydrides react quickly with water and form those oxoacids again. Many organic acids, like carboxylic acids and phenols ...
OrganismsChemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentPhenomena and ProcessesDisciplines and OccupationsAnthropology, Education, Sociology and Social PhenomenaTechnology, Industry, AgricultureInformation ScienceHealth Care
AnhydridesAcetic AnhydridesPhthalic AnhydridesMaleic AnhydridesSuccinic AnhydridesCitraconic AnhydridesEpoxy ResinsFluoroacetatesAconitic AcidMaleatesDiethyl PyrocarbonateDisaccharidesTrifluoroacetic AcidPhthalic AcidsPyran CopolymerChemistryCoenzyme A-TransferasesChemical PhenomenaGas Chromatography-Mass SpectrometryFuransRutamycinNorbornanesRuminococcusAcylationBenzene DerivativesMolecular StructureSuccinatesMercaptoethylaminesIndicators and ReagentsFormatesMetals, Rare EarthMaleic HydrazideMetals, Alkaline EarthFructoseCrystallizationPatents as TopicCrystallography, X-RayX-Ray DiffractionEncyclopedias as TopicChemistry, OrganicAcetylationDictionaries, MedicalDictionaries as TopicElectronic MailFood Dispensers, AutomaticEditorial PoliciesAuthorshipPeriodicals as TopicPostal ServiceInternetMutagenicity TestsMutagensOenantheSalmonella typhimurium
Alkenylsuccinic anhydrides - WikipediaAlkenylsuccinic anhydrides - Wikipedia
Alkenyl succinic anhydrides (ASA) are modified five-membered succinic anhydrides bearing a branched iso-alkenyl chain (C14 to ... "Alkenyl succinic anhydrides process" US 8350058, D. Leinweber, T. Rau, "Method for producing alkenyl succinic anhydrides" US ... "Process for reacting an olefin with maleic anhydride to obtain an alkenyl succinic anhydride" US 4158664, C.M. Selwitz, H.I. ... and less dark colored alkenyl succinic anhydride (ASA) were needed. The use of alkenylsuccinic anhydrides to hydrophobize ...
en.wikipedia.org
Succinic anhydride - WikipediaSuccinic anhydride - Wikipedia
Industrially, succinic anhydride is prepared by catalytic hydrogenation of maleic anhydride. Succinic anhydride hydrolyzes ... Succinic anhydride, is an organic compound with the molecular formula (CH2CO)2O. This colorless solid is the acid anhydride of ... In this role, the anhydride is proposed to form an ester with the hydroxyl groups on the cellulose fibers. Maleic anhydride ... Maleic anhydride undergoes the Alder-ene reaction with olefins to give alkenylsuccinic anhydrides. Such compounds are sizing ...
en.wikipedia.org
Anhydride | Encyclopedia.comAnhydride | Encyclopedia.com
... the anhydride can also react with water to form the original compound. ... anhydride (ănhī´drīd, -drĬd) [Gr.,=without water], chemical compound formed by removing water, H2O, from another compound; ... Anhydrides of organic acids have many uses. They react with alcohols to form esters; e.g., acetic anhydride, (CH3CO)2O, reacts ... the anhydride can also react with water to form the original compound. An acid anhydride reacts with water to form an acid; e.g ...
encyclopedia.com
Thiodiglycolic anhydrideThiodiglycolic anhydride
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database ...
webbook.nist.gov
Maleic anhydrideMaleic anhydride
Other names: 2,5-Furandione; cis-Butenedioic anhydride; Dihydro-2,5-dioxofuran; Maleic acid anhydride; Toxilic anhydride; ... Maleic anhydride, briquettes; Anhydrid kyseliny maleinove; Maleinanhydrid; Rcra waste number U147; UN 2215; 2,5-Furanedione; M ...
webbook.nist.gov
CDC - NIOSH Pocket Guide to Chemical Hazards - Acetic anhydrideCDC - NIOSH Pocket Guide to Chemical Hazards - Acetic anhydride
Ethanoic anhydride Colorless liquid with a strong, pungent, vinegar-like odor. ... Acetic acid anhydride, Acetic oxide, Acetyl oxide, ... Acetic acid anhydride, Acetic oxide, Acetyl oxide, Ethanoic ...
cdc.gov
CDC - NIOSH Pocket Guide to Chemical Hazards - Phthalic anhydrideCDC - NIOSH Pocket Guide to Chemical Hazards - Phthalic anhydride
Design Gallery for designs... in a gallery.
cdc.gov
Patent US4288372 - Production of maleic anhydride - Google PatentsPatent US4288372 - Production of maleic anhydride - Google Patents
... for example maleic and phthalic anhydrides, are prepared from a vanadium/phosphorus mixed oxide precursor by conditioning it by ... Catalysts for the oxidation of hydrocarbons to acid anhydrides, ... Process of preparing anhydrides from alkanes. US4153577 *. May ... Catalysts for the oxidation of hydrocarbons to acid anhydrides, for example maleic and phthalic anhydrides, are prepared from a ... Catalysts for the oxidation of hydrocarbons to acid anhydrides, for example maleic and phthalic anhydrides, are prepared from a ...
google.com
ICSC 1374 - TETRACHLOROPHTHALIC ANHYDRIDEICSC 1374 - TETRACHLOROPHTHALIC ANHYDRIDE
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations ...
inchem.org
ICSC 1312 - SUCCINIC ANHYDRIDEICSC 1312 - SUCCINIC ANHYDRIDE
See Also: Toxicological Abbreviations Succinic Anhydride (IARC Summary & Evaluation, Volume 15, 1977) ...
inchem.org
Patent US4666527 - Continuous crystallization of fructose anhydride - Google PatentsPatent US4666527 - Continuous crystallization of fructose anhydride - Google Patents
... whereby large and uniform crystals of fructose anhydride can be obtained in an enhanced yield. ... The present invention relates to a process for continuously crystallizing fructose anhydride using a seed crystallization tank ... In the crystallization step of the fructose anhydride, an aqueous fructose solution containing at least 90 W/W %, preferably at ... For the crystallization of fructose anhydride in this example, an aqueous fructose solution separated from an aqueous glucose ...
google.com
Trimellitic anhydride (HSG 71, 1992)Trimellitic anhydride (HSG 71, 1992)
71) 1. Phthalic anhydrides - adverse effects 2. Phthalic anhydrides - standards 3. Phthalic anhydrides - toxicity 4. Accidents ... 2-anhydride; 1,2,4-benzenetricarboxylic anhydride; 4-carboxyphthalic anhydride; 1,3-dioxo-5-phthalancarboxylic acid; 5- ... TRIMELLITIC ANHYDRIDE (1,2,4-benzenetricarboxylic acid 1,2-anhydride; 4-carboxyphthalic anhydride; 1,3-dioxo-5- ... Hydrolysis of the anhydride was not checked during the study. Trimellitic anhydride can thus be considered as readily ...
inchem.org
Anhydride Monomers - Monomers | Sigma-AldrichAnhydride Monomers - Monomers | Sigma-Aldrich
Anhydrides are also used to make cross-linked, network polymer resins; additional anhydrides commonly used for this application ... Unsaturated anhydrides undergo additional polymerization, usually with styrene, acrylics, and vinyl ethers. ... Anhydrides are very versatile as they can undergo condensation reactions to give polyesters, -imides, -ester-amides, and -ester ... Anhydrides are also used to make cross-linked, network polymer resins; additional anhydrides commonly used for this application ...
sigmaaldrich.com
Acetic anhydride - WikipediaAcetic anhydride - Wikipedia
"Acid Anhydrides", Understanding Chemistry, retrieved 2006-03-25. . *^ Shakhashiri, Bassam Z., "Acetic Acid & Acetic Anhydride" ... Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula (CH3CO)2O. Commonly abbreviated Ac2O, it is ... Acetic anhydride, like most acid anhydrides, is a flexible molecule with a nonplanar structure.[3] The pi system linkage ... Like most acid anhydrides, the carbonyl carbon of acetic anhydride has electrophilic character, as the leaving group is ...
en.m.wikipedia.org
Acetic anhydride - definition of acetic anhydride by The Free DictionaryAcetic anhydride - definition of acetic anhydride by The Free Dictionary
acetic anhydride synonyms, acetic anhydride pronunciation, acetic anhydride translation, English dictionary definition of ... acetic anhydride. n a colourless pungent liquid used in the manufacture of cellulose and vinyl acetates for synthetic fabrics. ... ace′tic anhy′dride. n. a colorless, pungent liquid, C4H6O3, the anhydride of acetic acid: used chiefly as a reagent and in the ... Related to acetic anhydride: acetic acid. acetic anhydride. n (Elements & Compounds) a colourless pungent liquid used in the ...
thefreedictionary.com
Plus itPlus it
THE ACETIC ANHYDRIDE TEST IN CEREBRO-SPINAL FLUID Br Med J 1929; 2 :953 ... THE ACETIC ANHYDRIDE TEST IN CEREBRO-SPINAL FLUID. Br Med J 1929; 2 doi: https://doi.org/10.1136/bmj.2.3594.953 (Published 23 ...
bmj.com
SPECTRUM Acetic Anhydride, 500ml - 26XH54|A1668-500ML - GraingerSPECTRUM Acetic Anhydride, 500ml - 26XH54|A1668-500ML - Grainger
Looking for SPECTRUM Acetic Anhydride, 500ml (26XH54)? Graingers got your back. Price:$174.24. Easy ordering & convenient ...
grainger.com
IUPAC - acid anhydrides (A00072)IUPAC - acid anhydrides (A00072)
acetic benzenesulfonic anhydride, A00072-3.png. (thiobenzoic) anhydride.. Source: PAC, 1995, 67, 1307. (Glossary of class names ...
goldbook.iupac.org
Sedoheptulose anhydride monohydrate | Sedoheptulosan | Sigma-AldrichSedoheptulose anhydride monohydrate | Sedoheptulosan | Sigma-Aldrich
Sedoheptulose anhydride monohydrate; CAS Number: 469-90-9; EC Number: 207-424-7; Synonym: 2,7-Anhydro-β-D-altro-heptulopyranose ... Sedoheptulose anhydride monohydrate Synonym: 2,7-Anhydro-β-. D. -altro-heptulopyranose, Sedoheptulosan ...
sigmaaldrich.com
Maleic anhydride | C4H2O3 | ChemSpiderMaleic anhydride | C4H2O3 | ChemSpider
A cyclic dicarboxylic anhydride that is the cyclic anhydride of maleic acid. ChEBI CHEBI:474859, https://www.ebi.ac.uk/chebi/ ...
chemspider.com
4-Nitrophthalic anhydride 54668424-Nitrophthalic anhydride 5466842
Testing Status of 4-Nitrophthalic anhydride 5466842. CASRN: 5466-84-2. Formula: C8-H3-N-O5. Synonyms/Common Names. *1,3- ...
ntp.niehs.nih.gov
2016 Global Tri-Mellitic-Anhydride(TMA)Industry Review: Reportstack2016 Global Tri-Mellitic-Anhydride(TMA)Industry Review: Reportstack
Global Tri-Mellitic-Anhydride(TMA)Industry 2016 Market Research Report ​is a new market research publication announced by ... The Tri-Mellitic-Anhydride (TMA) market analysis is provided for the international market including development history, ... To view the table of contents and know more details please visit Global Tri-Mellitic-Anhydride(TMA)Industry 2016 Market ... 8 Major Manufacturers Analysis of Tri-Mellitic-Anhydride (TMA) 8.1 FHR 8.1.1 Company Profile 8.1.2 Product Picture and ...
pitchengine.com
Maleic anhydride - Substance Information - ECHAMaleic anhydride - Substance Information - ECHA
Maleic anhydride. ↓Other names: Regulatory process names [2] Trade names [62] IUPAC names [16] ...
echa.europa.eu
Succinic anhydride - Registration Dossier - ECHASuccinic anhydride - Registration Dossier - ECHA
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...
echa.europa.eu
Succinic anhydride - Registration Dossier - ECHASuccinic anhydride - Registration Dossier - ECHA
Succinic anhydride. CAS number:. 108-30-5. No inventory information available. Reference substance information. IUPAC name:. ...
echa.europa.eu
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AnhydridesAcetic AnhydridesPhthalic AnhydridesMaleic AnhydridesSuccinic AnhydridesCitraconic AnhydridesEpoxy ResinsFluoroacetatesAconitic AcidMaleatesDiethyl PyrocarbonateDisaccharidesTrifluoroacetic AcidPhthalic AcidsPyran CopolymerChemistryCoenzyme A-TransferasesChemical PhenomenaGas Chromatography-Mass SpectrometryFuransRutamycinNorbornanesRuminococcusAcylationBenzene DerivativesMolecular StructureSuccinatesMercaptoethylaminesIndicators and ReagentsFormatesMetals, Rare EarthMaleic HydrazideMetals, Alkaline EarthFructoseCrystallizationPatents as TopicCrystallography, X-RayX-Ray DiffractionEncyclopedias as TopicChemistry, OrganicAcetylationDictionaries, MedicalDictionaries as TopicElectronic MailFood Dispensers, AutomaticEditorial PoliciesAuthorshipPeriodicals as TopicPostal ServiceInternetMutagenicity TestsMutagensOenantheSalmonella typhimurium
MaleicAcidCatalystsAcetylationEsterificationDerivativesFlammableEthanolSynthesis
Maleic1
  • The maleic anhydrides, a series of reversible acylating agents, have now been shown to produce the aspirin-type defect in platelet aggregation. (elsevier.com)
Acid2
Catalysts1
Acetylation1
  • of modified food starch and for acetylation of monoglycerides Acetic anhydride is a versatile reagent for acetylations, the introduction of acetyl groups to organic substrates. (hmdb.ca)
Esterification1
Derivatives1
Flammable1
Ethanol1
Synthesis1
  • Because of its use for the synthesis of heroin by the diacetylation of morphine, acetic anhydride (known as 'AA' in clandestine chemistry circles) is listed as a U.S. DEA List II Precursor, and restricted in many other countries. (hmdb.ca)
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