A group of 1,2-benzenediols that contain the general formula R-C6H5O2.
A mobile, very volatile, highly flammable liquid used as an inhalation anesthetic and as a solvent for waxes, fats, oils, perfumes, alkaloids, and gums. It is mildly irritating to skin and mucous membranes.
Catalyzes the oxidation of catechol to 2-hydroxymuconate semialdehyde in the carbazole and BENZOATE degradation via HYDROXYLATION pathways. It also catalyzes the conversion of 3-methylcatechol to cis, cis-2-hydroxy-6-oxohept-2,4-dienoate in the TOLUENE and XYLENE degradation pathway. This enzyme was formerly characterized as EC 1.13.1.2.
2- or 4-Hydroxyestrogens. Substances that are physiologically active in mammals, especially in the control of gonadotropin secretion. Physiological activity can be ascribed to either an estrogenic action or interaction with the catecholaminergic system.
An enzyme that catalyzes the oxidation of catechol to muconic acid with the use of Fe3+ as a cofactor. This enzyme was formerly characterized as EC 1.13.1.1 and EC 1.99.2.2.
Enzyme that catalyzes the movement of a methyl group from S-adenosylmethionone to a catechol or a catecholamine.
Compounds that contain two halogenated benzene rings linked via an OXYGEN atom. Many polybrominated diphenyl ethers are used as FLAME RETARDANTS.
Ethers that are linked to a benzene ring structure.
Non-heme iron-containing enzymes that incorporate two atoms of OXYGEN into the substrate. They are important in biosynthesis of FLAVONOIDS; GIBBERELLINS; and HYOSCYAMINE; and for degradation of AROMATIC HYDROCARBONS.
Oxidases that specifically introduce DIOXYGEN-derived oxygen atoms into a variety of organic molecules.
Macrocyclic polyethers with the repeating unit of (-CH2-CH2-O)n where n is greater than 2 and some oxygens may be replaced by nitrogen, sulfur or phosphorus. These compounds are useful for coordinating CATIONS. The nomenclature uses a prefix to indicate the size of the ring and a suffix for the number of heteroatoms.
Phospholipids which have an alcohol moiety in ethereal linkage with a saturated or unsaturated aliphatic alcohol. They are usually derivatives of phosphoglycerols or phosphatidates. The other two alcohol groups of the glycerol backbone are usually in ester linkage. These compounds are widely distributed in animal tissues.
An enzyme of the oxidoreductase class that catalyzes the reaction between catechol and oxygen to yield benzoquinone and water. It is a complex of copper-containing proteins that acts also on a variety of substituted catechols. EC 1.10.3.1.
Compounds in which one or more of the three hydroxyl groups of glycerol are in ethereal linkage with a saturated or unsaturated aliphatic alcohol; one or two of the hydroxyl groups of glycerol may be esterified. These compounds have been found in various animal tissue.
An antiseptic and disinfectant aromatic alcohol.
Benzoate derivatives substituted by one or more hydroxy groups in any position on the benzene ring.
A genus of gram-negative, aerobic, rod-shaped bacteria widely distributed in nature. Some species are pathogenic for humans, animals, and plants.
Mold and yeast inhibitor. Used as a fungistatic agent for foods, especially cheeses.
Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.
An estrogenic steroid produced by HORSES. It has a total of five double bonds in the A- and B-ring. High concentration of equilenin is found in the URINE of pregnant mares.
A group of compounds that contain the general formula R-OCH3.
Derivatives of BENZOIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the carboxybenzene structure.
An ethylene compound with two hydroxy groups (-OH) located on adjacent carbons. They are viscous and colorless liquids. Some are used as anesthetics or hypnotics. However, the class is best known for their use as a coolant or antifreeze.
Toxic, volatile, flammable liquid hydrocarbon byproduct of coal distillation. It is used as an industrial solvent in paints, varnishes, lacquer thinners, gasoline, etc. Benzene causes central nervous system damage acutely and bone marrow damage chronically and is carcinogenic. It was formerly used as parasiticide.
Biphenyl compounds which are extensively brominated. Many of these compounds are toxic environmental pollutants.
A species of gram-negative, aerobic bacteria isolated from soil and water as well as clinical specimens. Occasionally it is an opportunistic pathogen.
Benzene derivatives that include one or more hydroxyl groups attached to the ring structure.
Materials applied to fabrics, bedding, furniture, plastics, etc. to retard their burning; many may leach out and cause allergies or other harm.
A trihydroxybenzene or dihydroxy phenol that can be prepared by heating GALLIC ACID.
Derivatives of adipic acid. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain a 1,6-carboxy terminated aliphatic structure.
A fungistatic compound that is widely used as a food preservative. It is conjugated to GLYCINE in the liver and excreted as hippuric acid.
A substance that is an irritant to the eyes and respiratory tract and may be carcinogenic.
A widely used industrial solvent.
Estrone derivatives substituted with one or more hydroxyl groups in any position. They are important metabolites of estrone and other estrogens.
Benzoic acid or benzoic acid esters substituted with one or more chlorine atoms.
A genus of coccoid bacteria in the family PLANOCOCCACEAE. They are widely distributed in various habitats including sea water, freshwater ponds, cyanobacterial mats, and in marine animals.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
A genus of gram-negative bacteria of the family MORAXELLACEAE, found in soil and water and of uncertain pathogenicity.
A bacterial genus of the order ACTINOMYCETALES.
Widely distributed enzymes that carry out oxidation-reduction reactions in which one atom of the oxygen molecule is incorporated into the organic substrate; the other oxygen atom is reduced and combined with hydrogen ions to form water. They are also known as monooxygenases or hydroxylases. These reactions require two substrates as reductants for each of the two oxygen atoms. There are different classes of monooxygenases depending on the type of hydrogen-providing cosubstrate (COENZYMES) required in the mixed-function oxidation.
Compounds of the general formula R-O-R arranged in a ring or crown formation.
A genus of gram-negative, aerobic, motile bacteria that occur in water and soil. Some are common inhabitants of the intestinal tract of vertebrates. These bacteria occasionally cause opportunistic infections in humans.
Hydrocarbon rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.
A species of gram-negative bacteria in the genus PSEUDOMONAS, which is found in SOIL and WATER.
Low-molecular-weight compounds produced by microorganisms that aid in the transport and sequestration of ferric iron. (The Encyclopedia of Molecular Biology, 1994)
GLYCEROPHOSPHOLIPIDS in which one of the two acyl chains is attached to glycerol with an ether alkenyl linkage instead of an ester as with the other glycerophospholipids.
An enzyme of the oxidoreductase class that catalyzes the reaction between L-tyrosine, L-dopa, and oxygen to yield L-dopa, dopaquinone, and water. It is a copper protein that acts also on catechols, catalyzing some of the same reactions as CATECHOL OXIDASE. EC 1.14.18.1.
Placing of a hydroxyl group on a compound in a position where one did not exist before. (Stedman, 26th ed)
A family of isomeric, colorless aromatic hydrocarbon liquids, that contain the general formula C6H4(CH3)2. They are produced by the destructive distillation of coal or by the catalytic reforming of petroleum naphthenic fractions. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts.
The larger air passages of the lungs arising from the terminal bifurcation of the TRACHEA. They include the largest two primary bronchi which branch out into secondary bronchi, and tertiary bronchi which extend into BRONCHIOLES and PULMONARY ALVEOLI.
Pigment obtained by the oxidation of epinephrine.
The chemical alteration of an exogenous substance by or in a biological system. The alteration may inactivate the compound or it may result in the production of an active metabolite of an inactive parent compound. The alterations may be divided into METABOLIC DETOXICATION, PHASE I and METABOLIC DETOXICATION, PHASE II.
Salts and esters of gentisic acid.
The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
The salts or esters of salicylic acids, or salicylate esters of an organic acid. Some of these have analgesic, antipyretic, and anti-inflammatory activities by inhibiting prostaglandin synthesis.
The rate dynamics in chemical or physical systems.
A general class of ortho-dihydroxyphenylalkylamines derived from tyrosine.
A methylated metabolite of norepinephrine that is excreted in the urine and found in certain tissues. It is a marker for tumors.
Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.
A genus in the family BURKHOLDERIACEAE, comprised of many species. They are associated with a variety of infections including MENINGITIS; PERITONITIS; and URINARY TRACT INFECTIONS.
Organic compounds containing carbon and hydrogen in the form of an unsaturated, usually hexagonal ring structure. The compounds can be single ring, or double, triple, or multiple fused rings.
A family of nonmetallic, generally electronegative, elements that form group 17 (formerly group VIIa) of the periodic table.
A group of gram-negative bacteria consisting of rod- and coccus-shaped cells. They are both aerobic (able to grow under an air atmosphere) and microaerophilic (grow better in low concentrations of oxygen) under nitrogen-fixing conditions but, when supplied with a source of fixed nitrogen, they grow as aerobes.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Methyl, propyl, butyl, and ethyl esters of p-hydroxybenzoic acid. They have been approved by the FDA as antimicrobial agents for foods and pharmaceuticals. (From Hawley's Condensed Chemical Dictionary, 11th ed, p872)
The functional hereditary units of BACTERIA.
The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups.
Catechol, for example, is synthesized from o-hydroxy and o-alkoxy phenyl aldehydes and ketones, and is used as the starting ... Surrey, Alexander R. (1946). "Pyrogallol 1-Monomethyl ether". Organic Syntheses. 26: 90-2. doi:10.15227/orgsyn.026.0090. PMID ... Dakin, H.D. (1923). "Catechol". Organic Syntheses. 3: 28. doi:10.15227/orgsyn.003.0028. ...
Experiments on the orientation of substituted catechol ethers. Journal of the Chemical Society, Transactions, 111: 903-929. ...
Synthesis from catechol requires an additional step, Williamson ether synthesis using dichloromethane. Piperonal, like all ... Piperonal can be prepared by the oxidative cleavage of isosafrole or by using a multistep sequence from catechol or 1,2- ... doi:10.1016/S0040-4039(00)88578-0. Bonthrone, W. & Cornforth, J. (1969). "The methylenation of catechols". Journal of the ...
As one of the most popular crown ethers, it facilitates the dissolution of many salts in organic solvents. It is related to the ... non-benzannulated 18-crown-6. Dibenzo-18-crown-6 can be synthesized from catechol and bis(chloroethyl) ether. In contrast to ... Rogers, Robin D.; Song, Ying (1995). "The crystal structure of a heterobimetallic crown ether complex: [Na(dibenzo-18-crown-6 ...
Classically artificial enzymes bind substrates using receptors such as cyclodextrin, crown ethers, and calixarene. Artificial ... and catechol oxidase). Artificial enzymes have been designed from scratch via a computational strategy using Rosetta. In ...
Synthesis for a standard β-blocker begins with the mono-alkylation of catechol to give an ether (see figure 4). The fundamental ... The ring opening of the epoxide ring in glycidic ether is done with an appropriate amine, such as isopropyl amine or tert- ... It consists of displacement of the halogen directly with a SN2 reaction to give the same glycidic ether. When following both ...
E.g. a Viloxazine type of catechol ether is used, but 4-phenyl instead of based on a morpholine ring. Alaproclate Indalpine ...
... is prepared from catechol, beginning with ethylation to give guaethol (1). This ether condenses with glyoxylic ...
The simplest of methoxy compounds are methanol and dimethyl ether. Other methoxy ethers include anisole and vanillin. Many ... Catechol-O-methyl transferase (COMT). Many natural products in plants, e.g. lignins, are generated via catalysis by caffeoyl- ... Cheung, Chi Wai; Buchwald, Stephen L. (2 August 2013). "Mild and General Palladium-Catalyzed Synthesis of Methyl Aryl Ethers ...
Further, he determined that the substance was a type of alkyl catechol, and due to its structure it was able to penetrate ... It is soluble in diethyl ether, acetone, ethanol, carbon tetrachloride, and benzene. Urushiol is a mixture of several closely ... Each consists of a catechol substituted in the 3 position with a hydrocarbon chain that has 15 or 17 carbon atoms. The ... Whereas western poison oak urushiol contains chiefly catechols with C17 side-chains, poison ivy and poison sumac contain mostly ...
Two equivalents of CAN are required for each equivalent of para-methoxybenzyl ether. The alcohol is released, and the para- ... Quinones are produced from catechols and hydroquinones and even nitroalkanes are oxidized. CAN provides an alternative to the ... The CAN-catalyzed three-component reaction between anilines and alkyl vinyl ethers provides an efficient entry into 2-methyl-1, ... CAN is used to cleave para-methoxybenzyl and 3,4-dimethoxybenzyl ethers, which are protecting groups for alcohols. ...
Its methyl ether derivative, guaiacol, converts to catechol via hydrolysis of the CH3-O bond as promoted by hydriodic acid. ... catechol was listed as pyrocatechol. In 1879, the Journal of the Chemical Society recommended that catechol be called "catechol ... Catechol occurs as feathery white crystals that are very rapidly soluble in water. Catechol was first isolated in 1839 by Edgar ... Catechols produce quinones with the addition of ceric ammonium nitrate (CAN). Catechol is the conjugate acid of a chelating ...
Family 1.D.50 The Amphiphilic bis-Catechol Anion Transporter (AC-AT) Family 1.D.51 The Protein Nanopore (ProNP) Family 1.D.52 ... Family 1.D.54 The potassium-selective Hexyl-Benzoureido-15-Crown-5-Ether Ion Channel (HBEC) Family 1.D.55 The Porphyrin-based ... Family 1.D.67 The Crown Ether-modified Helical Peptide Ion Channel (CEHP) Family 1.D.68 The Pore-forming Pleuronic Block ...
Crown ethers are much broader than the oligomers of ethylene oxide; an important group are derived from catechol. Crown ethers ... Crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups. The most common crown ethers ... The smallest crown ether still capable of binding cations is 8-crown-4, with the largest experimentally confirmed crown ether ... aza crown ether thia crown ether 9-Crown-3 Cryptand Metallacrown van der Ham, Alex; Hansen, Thomas; Lodder, Gerrit; Codée, ...
... it reacts with catechol to form dibenzo-18-crown-6: Bis(chloroethyl) ether can be used in the synthesis of the cough ... Bis(chloroethyl) ether is an organic compound with the formula O(CH2CH2Cl)2. It is an ether with two 2-chloroethyl substituents ... ether is considered as a potential carcinogen. Bis(chloromethyl) ether Sulfur mustard NIOSH Pocket Guide to Chemical Hazards ... Bis(chloroethyl) ether is less reactive than the corresponding sulfur mustard S(CH2CH2Cl)2. In the presence of base, ...
Unlike borane itself or alkylboranes, catechol borane exists as a monomer. This behavior is a consequence of the electronic ... bisborane in an ethereal solvent such as diethyl ether. In 2001 Herbert Brown released an additional procedure for ... This colourless liquid is a derivative of catechol and a borane, having the formula C6H4O2BH. Traditionally catecholborane is ... produced by treating catechol with borane (BH3) in a cooled solution of THF. However, this method results in a loss of 2 mole ...
It is a red volatile solid that is soluble in water and ethyl ether. It is rarely encountered because of its instability, but ... 1,2-Benzoquinone is produced on oxidation of catechol exposed to air in aqueous solution or by ortho oxidation of a phenol. It ... A strain of the bacterium Pseudomonas mendocina metabolises benzoic acid, yielding 1,2-benzoquinone via catechol. Nomenclature ...
... tetramethyl ether) Rhamnazin Rhamnetin Tamarixetin other Eupatolitin Natsudaidain Acacetin Chrysoeriol Diosmetin Nepetin ... O-rhamnoside 7-O-methyltransferase Catechol-O-methyl transferase 5-desoxy-malvidin Capensinidin Europinidin Hirsutidin Malvidin ...
Solubility in water, ethanol and diethyl ether is low. The substance is typically used in form of the hydrochloride, a white ... Like epinephrine, adrenalone is metabolised by catechol-O-methyl transferase (COMT), yielding 3O-methyladrenalone, which in ...
Lin, Gang; Reid, Gillian; Bugg, Timothy D. H. (May 2001). "Extradiol Oxidative Cleavage of Catechols by Ferrous and Ferric ... Dications Stabilized by Azamacrocycles and Crown Ethers". Angewandte Chemie. 121 (28): 5254-5256. doi:10.1002/ange.200901247. ... Complexes of 1,4,7-Triazacyclononane: Insight into the Mechanism of the Extradiol Catechol Dioxygenases". Journal of the ...
Catechol ethers. *Indanes. *Sigma agonists. Hidden categories: *CS1 errors: missing periodical. *Articles with short ...
The method of Letsinger is dissolve the mixture in ether and precipitate the borinic ester by forming a complex with ammonia. ... Diphenylborinic acid has an extra high affinity for catechols compared with carbohydrates. Diphenylborinic acid can catalyse ...
One special case is catechol, where the C=C subunit is part of an aromatic ring. In some other cases however, enediols are ... Similarly, generation of the enol often is accompanied by "trapping" or masking of the hydroxy group as an ether, such as a ... Silylation gives silyl enol ether. Acylation gives esters such as vinyl acetate. In general, enols are less stable than their ... silyl enol ether. In organic chemistry, keto-enol tautomerism refers to a chemical equilibrium between a keto form (a ketone or ...
Feihe Huang showed an example of supramolecular alternating copolymer from two heteroditopic monomers carrying both crown ether ... Taking advantage of coordination interactions between catechol and ferric ions, researchers developed pH-controlled self- ... such as crown ethers/ammonium ions, cucurbiturils/viologens, calixarene/viologens, cyclodextrins/adamantane derivatives, and ... Takuzo Aida introduced an innovative polymer glass composed of a supramolecularly polymerized oligomeric ether thiourea, which ...
M. L. Tainter (1930). "Comparative actions of sympathomimetic compounds: catechol derivatives." J. Pharmacol. Exp. Ther. 40 43- ... hydrolysis of the resulting product was followed by cleavage of the methyl ethers using hydriodic acid to furnish epinine. A ... "methylamino-ethyl-catechol", as they called it, had about 1/7 x the pressor potency of epinephrine, but about 5 x the potency ... "methylamino-ethyl-catechol", under the name "epinine", as a substitute for epinephrine. Tainter further quantified the pressor ...
A nitro group is introduced at the 5-position adjacent to the hydroxyl group unmasked in the cleavage of the benzyl ether. The ... 2012). "Catechol-O-methyltransferase in complex with substituted 3′-deoxyribose bisubstrate inhibitors". Acta Crystallographica ... Manikumar, G.; Jin, C.; Rehder, K. S. (2008). "Convenient Synthesis of Tolcapone, a Selective Catechol‐O‐methyltransferase ... a novel inhibitor of catechol-O-methyltransferase". British Journal of Clinical Pharmacology. 48 (4): 513-520. doi:10.1046/j. ...
These include mestranol (EE 3-methyl ether), quinestrol (EE 3-cyclopentyl ether), ethinylestradiol sulfonate (EE 3- ... 2- and 4-methoxy-EE are also formed via transformation by catechol O-methyltransferase of 2- and 4-hydroxy-EE. Unlike the case ... Aside from sulfate conjugation, EE is mainly metabolized by hydroxylation into catechol estrogens. This is mainly by 2- ... 17α-ethynylestriol 3-cyclopentyl ether). Androstane analogues of EE with significant although weak estrogenic activity include ...
Polyphenols always have heteroatom substituents other than hydroxyl groups; ether and ester linkages are common, as are various ... Catechol and resorcinol (benzenediol) types of polyphenols have two, and pyrogallol and phloroglucinol (benzenetriol) types ... methyl phenyl ethers and O-phenyl glycosides. This definition departs from the WBSSH definition in terms of physicochemical ... various carbon-carbon bond linkages join hydrolytically labile esters and ethers as common in non-hydrolyzable condensed ...
It can be synthesized from catechol first by conversion to methylenedioxybenzene, which is brominated and coupled with allyl ... cyclic ethers). In 1885, the Dutch chemist Johann Frederik Eijkman (1851-1915) investigated shikimol, the essential oil that is ...
... crystallizes from benzene as colorless needles that are readily soluble in water, alcohol, and ether, but insoluble ... Lander, John J.; Svirbely, John J. Lander, W. J. (1945). "The Dipole Moments of Catechol, Resorcinol and Hydroquinone". Journal ...
... (4-OHE1), also known as estra-1,3,5(10)-triene-3,4-diol-17-one, is an endogenous, naturally occurring catechol ...
response to ether. • sphingolipid metabolic process. • response to immobilization stress. • norepinephrine biosynthetic process ...
Because of hydrogen bonding, alcohols tend to have higher boiling points than comparable hydrocarbons and ethers. The boiling ... point of the alcohol ethanol is 78.29 °C, compared to 69 °C for the hydrocarbon hexane, and 34.6 °C for diethyl ether. ...
... is also metabolized via hydroxylation into catechol estrogens. In the liver, it is non-specifically metabolized by ... Estrone methyl ether. *Estropipate. *Etamestrol (eptamestrol). *Ethinylestradiol *Ethinylestradiol 3-benzoate. * ...
... of mandelic acid are formed as a result of metabolism of adrenaline and noradrenaline by monoamine oxidase and catechol-O- ... soluble in diethyl ether, ethanol, isopropanol Acidity (pKa) 3.41[2] ...
Catechol melanins,. Flavolans (Condensed tannins),. Polyphenolic proteins, Polyphenols Raspberry ellagitannin, Tannic acid ... Methylations can occur by the formation of an ether bond on hydroxyl groups forming O-methylated polyphenols. In the case of ...
Iron(III) chloride is suspended in anhydrous diethyl ether and added to the Grignard reagent.[12] A redox reaction occurs, ... structure and reactions with catechols and [PtCl2(PR3)2](R = Et or Bun)". J. Chem. Soc., Dalton Trans. (18): 3653-3657. doi: ... 6). To that end, they reacted the Grignard compound cyclopentadienyl magnesium bromide in diethyl ether with ferric chloride as ...
... such as the catechol estrogens 2-hydroxyestradiol, 2-hydroxyestrone, 4-hydroxyestradiol, and 4-hydroxyestrone, as well as 16α- ... Diethylstilbestrol esters/ethers *Dimestrol (diethylstilbestrol dimethyl ether). *Fosfestrol (diethylstilbestrol diphosphate). ...
Catechol-O-methyl transferase EC 2.1.1.6. *DNA methyltransferase EC 2.1.1.72, EC 2.1.1.113, EC 2.1.1.37 ... Category:EC 3.3 (act on ether bonds)Edit. *Category:EC 3.3. *Adenosylmethionine hydrolase ...
Catechol melanins,. Flavolans (Condensed tannins),. Polyphenolic proteins,. Polyphenols. Raspberry ellagitannin,. Tannic acid. ... Methylations can occur by the formation of an ether bond on hydroxyl groups forming O-methylated polyphenols. In the case of ... Esterfication reactions and ether formation. *Electrophilic aromatic substitutions as the hydroxyl group is activating, for ...
Estradiol 3-tetrahydropyranyl ether. *Estradiol 17β-sulfate. *Estradiol 17β-tetrahydropyranyl ether ...
Guaiacol is a methyl ether of pyrocatechin, while creosol is a methyl ether of methyl-pyrocatechin, the next homolog of ... and then oxidation occurred transforming the aromatic into a catechol compound. Catechol allows for cleavage of the aromatic ... Methyl ethers differ from simple phenols in being less hydrophilic, caustic, and poisonous. This allows meat to be successfully ... In preparation of food by smoking, guaiacol contributes mainly to the smoky taste, while the dimethyl ether of pyrogallol, ...
Posts tagged as "North America Catechol ethyleneglycol ether Market Share" Catechol ethyleneglycol ether Market Report (2014- ... North America Catechol ethyleneglycol ether Market Report (2014-2024) - Market Size, Share, Price, Trend and Forecast WMR- ...
Ben-Haida, A., Colquhoun, H.M., Hodge, P. and Williams, D.J. (2006) Synthesis of a catechol-based poly(ether ether ketone) ("o- ... Synthesis of a catechol-based poly(ether ether ketone) ("o-PEEK") by classical step-growth polymerization and by entropically ... An amorphous, catechol-based analogue of PEEK ("o-PEEK") has been prepared by a classical step-growth polymerization reaction ... formed by cyclo-condensation of catechol with 4,4-difluorobenzophenone under pseudo-high-dilution conditions. The principal ...
Catechol, for example, is synthesized from o-hydroxy and o-alkoxy phenyl aldehydes and ketones, and is used as the starting ... Surrey, Alexander R. (1946). "Pyrogallol 1-Monomethyl ether". Organic Syntheses. 26: 90. doi:10.15227/orgsyn.026.0090. Jung, M ... Dakin, H.D. (1923). "Catechol". Organic Syntheses. 3: 28. doi:10.15227/orgsyn.003.0028. ...
CATECHOL DIMETHYL ETHER. ♦ PYROCATECHOL DIMETHYL ETHER. ♦ BENZENE, 1,2-DIMETHOXY-. ♦ BENZENE, O-DIMETHOXY-. ♦ DIMETHOXYBENZENE ...
Other names: Benzene, o-dimethoxy-; o-Dimethoxybenzene; O,O-Dimethyl catechol; Pyrocatechol dimethyl ether; Veratrol; Veratrole ... Catechol dimethyl ether; NSC 16934; Methylguaiacol; 1,2-Dimethoxybenzene (veratroI); 1,2-Dimethoxybenzene (veratrole); 1,2- ... The structure of some cyclic ethers of o-dihydroxybenzene, J. Chem. Soc., 1958, 2595-2597. [all data] ...
Catechol monomethyl ether; o-Guiacol; ortho-Guaiacol; NSC 3815; 2-methoxyphenol (guaiacol); 2-Methoxy phenol (guiacol); guiacol ... O-Methyl catechol; Pyrocatechol monomethyl ether; Pyroguaiac acid; 1-Hydroxy-2-methoxybenzene; 2-Hydroxyanisole; 2- ...
... catechol; resorcinol; triethylene glycol; polyethylene glycol; sorbitol; divinyl ethers and diepoxides; and the like. If the ... Suitable cationically-curable monomers include those containing epoxide or vinyl ether functional groups. Suitable water- ... emulsion has a nonaqueous immiscible phase, crosslinking agents sensitive to water such as diepoxides and divinyl ethers can be ... including crown and cryptand ethers), and cyclodextrans. ...
The inclusion complexes of hydroquinol and catechol dimethyl ethers with bisparaquat (1,4)cyclophane, (P. R. Ashton, B. Odell, ... The inclusion complexes of hydroquinol and catechol dimethyl ethers with bisparaquat (1,4)cyclophane. Isostructural alternately ...
1 edition of The action of thionyl chloride and of phosphorus pentachloride on the methylene ethers of catechol derivatives ... The action of thionyl chloride and of phosphorus pentachloride on the methylene ethers of catechol derivatives. by Barger, ... The action of thionyl chloride and of phosphorus pentachloride on the methylene ethers of catechol derivatives by Barger, ... thebindyagency.com - The action of thionyl chloride and of phosphorus pentachloride on the methylene ethers of catechol ...
Crown ethers are much broader than the oligomers of ethylene oxide; an important group are derived from catechol. Crown ethers ... Crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups. The most common crown ethers ... The smallest crown ether still capable of binding cations is 8-crown-4, with the largest experimentally confirmed crown ether ... aza crown ether thia crown ether 9-Crown-3 Cryptand Metallacrown van der Ham, Alex; Hansen, Thomas; Lodder, Gerrit; Codée, ...
In all cases both mono- and diallyl ethers of catechol were formed. The catechol monoallyl ether on rearrangement gave 3- and 4 ... Catechol monoallyl ether To stirred catechol (44 g.; 0.4 mole), dry acetone (125 ml.) and freshly fused potassium carbonate ( ... 6-allyleuginol allyl ether of allylguaiacol, etc.16. It was hoped that catechol allyl ether, when rearranged under these ... catechol (9.9 g.) was recovered by extraction with ether. The filtrate was dissolved in ether, acidified and washed free of ...
Crown ethers are much broader than the oligomers of ethylene oxide; an important group is derived from catechol. ... Structures of some common crown ethers. Structures of common crown ethers: 12-crown-4, 15-crown-5, 18-crown-6, dibenzo-18-crown ... Crown ethers are heterocyclic chemical compounds that consist of a ring containing several ether groups. The most common crown ... Crown ethers in nature. Crown ethers are not the only macrocyclic ligands that have affinity for the potassium cation. ...
Suitable free radical stabilizers include without limitation; butylated hydroxy anisole (BHA); hydroquinone; catechol; ... ether-bonded ammonium salts and alkylimidazolinium salts, cyclosulfur compounds and derivatives, and polyalkylene oxides and ... hydroquinone monomethyl ether and hindered phenols such as butylated hydroxyanisol; 4-ethoxyphenol; butylated hydroxytoluene ( ... polyether ether ketones, thermoplastic polyimides, polybenzimidazoles, polyquinoxalones, polyoxazolines, styrene-acrylonitrile ...
Catechol monomethyl ether, Pyrocatechol monomethyl ether; Linear Formula: C7H8O2; find Sigma-Aldrich-G5502 MSDS, related peer- ...
Mussel-Inspired Catechol-Functionalized Hydrogels and Their Medical Applications. Next Article in Special Issue. Methyl Ether- ...
1. Catechol O-methyltransferase. General function:. Involved in magnesium ion binding. Specific function:. Catalyzes the O- ... Quercetagetin 6-methyl ether. ChEBI. 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-6-methoxy-4H-1-benzopyran-4-one, 9ci. HMDB. ... and phenolic and catechol drugs.. Gene Name:. SULT1A3. Uniprot ID:. P0DMM9 Molecular weight:. 34195.96. Reactions. Patuletin ... methylation, and thereby the inactivation, of catecholamine neurotransmitters and catechol hormones. Also shortens the ...
Synonym(s): 2-Methoxyphenol; Catechol monomethyl ether; Pyrocatechol monomethyl ether Empirical Formula: C7H8O2 Linear Formula ... Catechol monomethyl ether; Pyrocatechol monomethyl ether Empirical Formula: C7H8O2 Formula Weight: 124.14 Linear Formula: (CH3O ... Synonym(s): Catechol monomethyl ether, Guaiacol Formula: C7H8O2 Formula weight: 124.14 Purity: 98+% CAS Number: 90-05-1 ... Glycidyl 2-methoxyphenyl ether, 98% Alfa Aesar. Synonym(s): Guaiacol glycidyl ether, 2-[(2-Methoxyphenoxy)methyl]oxirane ...
PubMed:The reactivity of ortho-methoxy-substituted catechol radicals with sulfhydryl groups: contribution for the comprehension ... PubMed:Carbonic anhydrase inhibitors: guaiacol and catechol derivatives effectively inhibit certain human carbonic anhydrase ... catechol monomethyl ether. creosol. p-. creosol. para-. creosol. creosol natural. homo. guaiacol. ...
Guaiacol is a phenolic compound with a methoxy group and is the monomethyl ether of catechol. Guaiacol is readily oxidized by ... 1. Catechol O-methyltransferase. General function:. Involved in magnesium ion binding. Specific function:. Catalyzes the O- ... Method for preparing guaiacol from catechol and dimethyl carbonate. Faming Zhuanli Shenqing Gongkai Shuomingshu (2007), 6pp. ... Catalyzes the O-methylation, and thereby the inactivation, of catecholamine neurotransmitters and catechol hormones (By ...
or 683 parts per million each of pure t-butyl catechol and hydroquinone monomethyl ether based on weight of MA charged and 17.7 ... Two particular preferred inhibitor systems utilize a combination of t-butyl catechol and monomethyl ether of hydroquinone or ... A number of suitable polymerization inhibitors include: hydroquinone, monomethyl ether of hydroquinone, parabenzoquinone, t- ...
A final ether extract contained lactic acid and gave a positive test for the catechol grouping. He believed that synthetic ... finding that an ether-soluble product contained lactic acid and gave a positive test for the catechol grouping. There was no ...
2-Methoxyphenol; Catechol monomethyl ether; Pyrocatechol monomethyl ether. 2-Methoxytoluene. 2-Methyl-1,3-benzoxazole. ...
2-Hydroxyestrone-3-methyl ether. 1.41 (0.42-4.39). 0.80 (0.25-1.55). Methylated 4-catechol EM. 0.20 (0.08-0.57). 0.11 (0.04- ... 4-Catechol EM. 4OHE1. −0.14. −0.11. −0.25. 0.82. 0.76. 0.77. 0.58. 1.0. 0.60. 0.60. 0.60. 0.56. 0.43. 0.30. 0.30. 0.06. 0.87. ... 2-Hydroxyestrone-3-methyl ether. 0.51 (0.40-0.61). 0.50 (0.40-0.61). Methylated 4-catechol EM. 0.25 (0.15-0.39). 0.27 (0.17- ... 2-Catechol EM. −0.30. −0.24. −0.42. 0.99. 1.0. 0.99. 0.90. 0.86. 0.62. 0.62. 0.64. 0.67. 0.43. 0.29. 0.29. 0.15. 0.99. 0.86. − ...
G) Chloroalkyl substituted catechol. P-07-0116. 01/07/08. 12/17/07. (G) Alkyl glycidyl ether. ... G) Aromatic polyisocyanate, glycol ethers-blocked. P-08-0170. 01/14/08. 04/12/08. CBI. (G) Crosslinking agent for coatings. (G ... G) Aromatic polyisocyanate, glycol ethers-blocked. P-08-0174. 01/14/08. 04/12/08. CBI. (G) Crosslinking agent for coatings. (G ... G) Acrylic polymer with styrene and polyethylene glycol methyl ether methacrylate. P-07-0453. 01/28/08. 01/11/08. (G) Halide ...
Deals in 4-Methylpropiophenone, Ethyl Acetoacetate, Ferrous Sulphate Crystal, catechol, Methyl tertiary butyl ether ... Deals in Lactose, SODIUM GLUCONATE, 4 Dioxane, Butyl Acetate, catechol, Amino Ethyl Ethanolamine, 2Ethyl Hexyl Acrylate, Methyl ... Petroleum Ether, Polyethylene Glycol, Adipic Acid, Tertiary Butanol, Succinic Acid, Ethyl Acetoacetate, Cleaning Chemicals, ... Diisopropyl Ether, sodium dithionite, Ethylene, Silver Iodide, Octabenzone, trimethylamine, Magnesium Citrate, bergamot orange ...
... catechol and guaiacol, was studied. The cleavage of the ether bonds, which are abundant in the molecular structure of lignin, ... Although it does not influence the cleavage of ether bonds, RANEY Nickel favours the production of phenol from both lignin and ... especially catechol. RANEY Nickel was found to be an adequate catalyst for hydrodeoxygenation. ... catechol. The main product from hydrodeoxygenation of guaiacol with RANEY Nickel was cyclohexanol. Reaction mechanism and ...
... catechol and guaiacol, was studied. The cleavage of the ether bonds, which are abundant in the molecular structure of lignin, ... Experiments with catechol and guaiacol showed that RANEY Nickel helps convert catechol into phenol (see Figure 5) in the ... guaiacol and catechol. Phenol is a secondary or even tertiary product derived from guaiacol or catechol [23, 24]. At 603 K long ... it shows a narrower product spectrum and a high selectivity in respect to phenol and catechol [9, 10]. The yield of catechol ...
Groups of six 7-week-old, female Sprague-Dawley rats (Harlan Laboratories, Haslett, IN) were lightly anesthetized with ether, ... catechol estrogen(s);. CE-Q,. catechol estrogen quinone(s);. DMF,. dimethylformamide;. DMSO,. dimethyl sulfoxide;. E1,. estrone ... Covalent Binding of 4-Hydroxy Catechol Estrogens and Their Quinones to DNA.. E1-3,4-Q or E2-3,4-Q (1 mg/50 μl of DMSO) was ... Furthermore, the hexestrol catechol is activated by HRP, LP, or cytochrome P450 to form an N7Gua adduct (ref. 28 and S. T. Jan ...
Groups of six 7-week-old, female Sprague-Dawley rats (Harlan Laboratories, Haslett, IN) were lightly anesthetized with ether, ... catechol estrogen(s);. CE-Q,. catechol estrogen quinone(s);. DMF,. dimethylformamide;. DMSO,. dimethyl sulfoxide;. E1,. estrone ... Catechol-O-Methyltransferase (COMT)-mediated Metabolism of Catechol Estrogens: Comparison of Wild-Type and Variant COMT ... Covalent Binding of 4-Hydroxy Catechol Estrogens and Their Quinones to DNA.. E1-3,4-Q or E2-3,4-Q (1 mg/50 μl of DMSO) was ...
... catechol, pyrogallol, hydroquinonemonomethyl ether, t-butylcatechol, phenothiazine and other polymerization inhibitors. The ... Examples of these compounds are benzoins such as benzoin and benzoin methyl ether, benzoin isopropyl ether andother benzoin ... dipropylene glycol diethyl ether and other glycol ethers; ethyl acetate, butyl cellosolve acetate, carbitol acetate and other ... TEPIC is triglycidyl ether isocyanurate available from Nissan Chemical Industries, Ltd., andLIGHT-ACRYLATE TMP-A is ...
  • Synonym(s): Catechol monomethyl ether, Guaiacol Formula: C7H8O2 Formula weight: 124.14 Purity: 98+% CAS Number: 90-05-1 Harmonized Tariff Code: 2909.50 Hazard Statements: H302-H315-H319 Harmful if swallowed. (thomassci.com)
  • Guaiacol is a phenolic compound with a methoxy group and is the monomethyl ether of catechol. (hmdb.ca)
  • They are mainly inactivated by COMT, 3 a Phase II enzyme that methylates catechol estrogens to less polar monomethyl ethers, which can then be excreted. (aacrjournals.org)
  • Clear cut depigmentation was seen with monomethyl-ether of hydroquinone (123319), and tertiary-butyl-catechol (27213781) in both guinea-pigs and mice, however the damage was less pronounced in mice. (cdc.gov)
  • 2-Methoxyphenol/Guaiacol;GAIACOL;o-Methoxyphenol;o-Hydroxyanisole;2-Methoxyphenol;Catechol monomethyl ether;Guaiaco;1-Hydroxy-2-methoxybenzene;a-methoxyphenolsalicyl me. (chinachemnet.com)
  • This comprises initially charging cyclohexane, 2-propylheptanol and hypophosphorous acid and adding to this mixture the stabilizer hydroquinone monomethyl ether (MEHQ), hypophosphorous acid, copper(II) chloride solution and acrylic acid. (patentsencyclopedia.com)
  • Such as 4-isopropyl catechol or hydroxyquinone monomethyl ether, which have toxic activity on melanocytes. (onfeetnation.com)
  • Guaiacol glyceryl ether, Guaifenesin Formula: C10H14O4 Formula weight: 198.22 Purity: 99+% CAS Number: 93-14-1 Harmonized Tariff Code: 2909.49 Hazard Statements: H301 Toxic if swallowed. (thomassci.com)
  • Liquefaction of enzymatic hydrolysis lignin as well as catalytical hydrodeoxygenation of the main intermediates in the degradation of lignin, that is, catechol and guaiacol, was studied. (hindawi.com)
  • 2. The reductive decomposition of 1-(4-hydroxyphenyl)-2-(2′-methoxyphenoxy)propane-1, 3-diol with metallic sodium in liquid ammonia has been performed, and the presence in the decomposition products of guaiacol, catechol, 4-hydroxyphenylpropane, 1-(4-hydroxyphenyl)propane-1-ol and 3-(4-hydroxyphenyl)propane-1-ol has been established. (springer.com)
  • More than 100 PHCs were indicated in the plasma, and among those a total of 9 monocyclic brominated or chlorinated phenol-, guaiacol-, and/or catechol-type compounds were identified as their methylated derivatives. (nih.gov)
  • A synthetic method for obtaining a lignin model compound of β-O-4 structure, guaiacyl glycerol-β-guaiacyl ether, was researched through five reaction steps from guaiacol. (ncsu.edu)
  • This relationship led us to postulate that oxidation of the carcinogenic 4-hydroxy catechol estrogens (CE) of estrone (E 1 ) and estradiol (E 2 ) to catechol estrogen-3,4-quinones (CE-3, 4-Q) results in electrophilic intermediates that covalently bind to DNA to form depurinating adducts. (pnas.org)
  • This relationship led us to postulate that oxidation of catechol estrogens (CE) to CE quinones (CE-Q) results in electrophilic intermediates that also covalently bind to DNA and form depurinating adducts. (pnas.org)
  • With further metabolism, the catechol estrogens are irreversibly methylated into 2-methoxyestrone, 2-methoxyestradiol, 2-hydroxyestrone-3-methyl ether, 4-methoxyestrone and 4-methoxyestradiol. (aacrjournals.org)
  • In addition, there were increased levels of some catechol estrogens e.g. 4-hydroxy-estrone (4-OHE1) and 2-hydroxyestradiol (2-OHE2) with decreased levels of methylated catechols e.g. 2-methoxy estradiol (2-MeOE2). (jcancer.org)
  • Metabolism of estrogens is characterized by two major pathways: one is hydroxylation at the 16-position and the second is hydroxylation to form the 2- and 4-catechol estrogens. (jcancer.org)
  • Oxidation of catechol estrogens to their quinones normally occurs in homeostasis which minimizes their reaction with DNA. (jcancer.org)
  • 1 edition of The action of thionyl chloride and of phosphorus pentachloride on the methylene ethers of catechol derivatives found in the catalog. (thebindyagency.com)
  • Moreover, amongst a number of catechol derivatives tested 2 4-allylcatechol exhibited the maximum antioxidant activity. (erowid.org)
  • Since then an increasingly long list of chemical agents, and in particular the phenol / catechol derivatives, have been associated with the development of vitiligo. (journals.co.za)
  • Solvay is offering a range of diphenolmolecules (hydroquinone and catechol derivatives) which can replace BPA in epoxy resins. (solvay.com)
  • Some derivatives of higher catechol ethers. (royalsoc.org.au)
  • Although the yield of monoaromatic components is not as high as in organic solvents, it shows a narrower product spectrum and a high selectivity in respect to phenol and catechol [ 9 , 10 ]. (hindawi.com)
  • Cytochrome P-450 1A1 (CYP1A1), Cytochrome P-450 1B1 (CYP1B1), Catechol-O-methyl transferase (COMT) and Nicotinamide adenine dinucleotide phosphate-quinone oxidoreductase 1 (NQO1). (jcancer.org)
  • The structural and spectroscopic characterization of mononuclear iron(III)-catecholato complexes of ligand L4 (methyl bis(1-methylimidazol-2-yl)(2-hydroxyphenyl)methyl ether, HL4) are described, which closely mimic the enzyme-substrate complex of the intradiol-cleaving catechol dioxygenases. (uu.nl)
  • Full depigmentation of the back was seen for p-tertiary-amyl-phenol and of the nipple for monobenzyl-ether of hydroquinone (123319) in guinea-pigs. (cdc.gov)
  • Application of isopropyl-catechol (28801345), hydroquinone (123319), p-tertiary-butyl-phenol (98544), phenol (108952), and catechol (120809) resulted in moderate depigmentation. (cdc.gov)
  • The association between vitiligo and occupational chemical exposures was first described in 1939 in leatherworkers in relation to exposure to mono-benzyl ether of hydroquinone in rubber gloves. (journals.co.za)
  • The chemical is called monobenzyl ether of hydroquinone, or monobenzone. (umassmed.edu)
  • He proceeded to report systematic studies of the synthesis and binding properties of crown ethers in a seminal series of papers. (wikipedia.org)
  • The fields of organic synthesis, phase transfer catalysts, and other emerging disciplines benefited from the discovery of crown ethers. (wikipedia.org)
  • Poly(ethylene glycol)s of various sizes were affixed to the chloromethylated substrate via Williamson ether synthesis to form "pseudocrown" ether chains. (edu.au)
  • Hence, the rates of synthesis of catechol by both T3MO and T4MO and the 1,2,3-trihydroxybenzene formation rate by TOM were found to be comparable to the rates of oxidation of the natural substrate toluene for these enzymes (10.0 ± 0.8, 4.0 ± 0.6, and 2.4 ± 0.3 nmol/min/mg of protein for T4MO, T3MO, and TOM, respectively, at a toluene concentration of 165 μM). (asm.org)
  • The inventors disclose here a novel, facile approach to the synthesis of acetonide-protected catechol-containing compounds having at least one amine group. (justia.com)
  • Acetonide-protected catechol-containing compounds such as DOPA and dopamine are useful in many applications, including Fmoc peptide synthesis and conjugating DOPA and dopamine with other small molecules, polymers, or macromolecules of interest. (justia.com)
  • To facilitate the synthesis of DOPA-containing therapeutic compounds and biomimetic materials, it is necessary to properly protect the catechol side-chain of DOPA during chemical reactions. (justia.com)
  • أجريت البلمرة المشتركة بشكل عشوائي بين ايبوكسي مونومر 2 والمونومر 7 (allyl glycidyl ether) بنسب مختلفة للحصول على بوليمر مشترك عشوائي 16 وتمت بنجاح إزلة مجموعة الحماية بواسطة استلة المثيلين للحصول على البوليمر17. (edu.sa)
  • تمت البلمرة المشتركة العشوائية للمونومر 27 والمونومر 7 (allyl glycidyl ether) بنسب مختلفة للحصول على بوليمر مشترك عشوائي 29 ونُشِطت زمرة أستال الميثيلين عن طريق وضع زمرة أسيتوكسي للحصول على البوليمر 31 والذي بدوره تعرض لتفاعل ثيول - رابطة ثنائية لزمر الاليل المتدلية باستخدام (cysteamine hydrochlorid) للحصول على بوليمر مشترك مشحون موجبا 32 لتشكيل قوصرة. (edu.sa)
  • Epoxy monomer II and allyl glycidyl ether IV in various proportions have been randomly copolymerized to obtain copolymer V . A mechanism has been proposed for the polymerization reaction involving chain transfer to the monomers. (rsc.org)
  • 5. The functionalized hydrogel of claim 1 , wherein the polymerizable moiety is grafted through an amide bond or an ether bond. (google.com)
  • The pendant allyl groups in VI have been elaborated via a thiol-ene reaction using cysteamine hydrochloride and thioglycolic acid to obtain cationic VII and anionic VIII polymers, both containing a mussel-inspired Dopa-based catechol moiety. (rsc.org)
  • We examined 483 Finnish breast cancer cases and 482 population controls to determine the potential effect of catechol- O -methyltransferase ( COMT ) genotype in individual susceptibility to breast cancer. (aacrjournals.org)
  • Crown ethers have been shown to coordinate to Lewis acids through electrostatic, σ-hole (see halogen bond) interactions, between the Lewis basic oxygen atoms of the crown ether and the electrophilic Lewis acid center. (wikipedia.org)
  • I thought of another, more economical idea for synthesizing catechol (since acetylsalicylic acid isn't exactly inexpensive). (sciencemadness.org)
  • The 2-hydroxyltoluene would be oxidized, then reacted with urea, then treated with calcium hypochlorite, and then diazotized with nitrous acid to yield catechol. (sciencemadness.org)
  • Previously, catechol has been produced by transforming d -glucose with a genetically modified Escherichia coli AB2834/pKD136/pKD9.069A strain expressing 3-dehydroshikimic acid dehydratase and protocatechuic acid decarboxylase ( 10 , 11 ) and by benzene oxidation with Pseudomonas putida 6-12 expressing toluene/benzene dioxygenase while lacking catechol 1,2-oxygenase and catechol 2,3-oxygenase ( 25 ). (asm.org)
  • As a special manufacturer, Taixing Zhongran Chemical Co., Ltd. mainly produces mordant dyes and Catechol diethyl ether, Diaminobenzenesulfonic Acid, Pyrocatechol monoethyl ether. (manufacturer.com)
  • This ether condenses with glyoxylic acid to give the corresponding mandelic acid derivative , which via oxidation and decarboxylation gives ethyl vanillin. (foodchem.cn)
  • The tannic acid of catechu is easily soluble in water and alcohol, but very slightly so in ether. (henriettes-herb.com)
  • Alcohol or ether dissolves its catechuic acid. (henriettes-herb.com)
  • Successive treatment of catechu with ether and absolute alcohol abstracts the two principal constituents, namely, from 13 to 33 per cent of crude catechin , also called catechuic acid , and from 22 to 50 per cent of a peculiar tannic acid, called catechu-tannic acid . (henriettes-herb.com)
  • Crown ethers strongly bind certain cations, forming complexes. (wikipedia.org)
  • Hydrothermal treatment in this context provides high selectivity in respect to hydroxybenzenes, especially catechol. (hindawi.com)
  • Crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups. (wikipedia.org)
  • The present invention relates to compounds and compositions of formula I, which are unsymmetrical aromatic ether diacids, and polymers formed from the same. (google.com.au)
  • In particular, we examined the effect of volatile compounds, ethers of cis 5-(29-hydroxyethyl) cyclopent-2-en-1-ol or of dihydroquinone, resorcinol or catechol. (biobees.com)
  • Heterocyclic compounds derived from catechol ethers. (royalsoc.org.au)
  • Catechol-containing molecules such as DOPA and dopamine are important compounds with widely useful effects as therapeutic agents. (justia.com)
  • The depigmenting capacity of some phenols, catechols, and organic antioxidants was studied. (cdc.gov)
  • 4-Allylcatechol has been synthesized earlier 3-5 by preparing the allyl ether of catechol and subjecting it to Claisen rearrangement. (erowid.org)
  • However, in the case of monoallyl ether of catechol, the allyl group migrates to the para position despite the availability of an unsubstituted ortho position. (erowid.org)
  • Though the ortho and para Claisen rearrangements have been studied so thoroughly, no explanation is available in literature for the anomalous behaviour of allyl ethers of mono- ortho -substituted polyhydroxybenzenes. (erowid.org)
  • Currently, catechol is produced primarily by the oxidation of phenol and m -diisopropylbenzene or by coal-tar distillation ( 13 ). (asm.org)
  • In the catechol pathway (Fig. S1 ), the metabolism involves further oxidation of 17- β estradiol (E2) to semiquinones and quinones which react with DNA to form depurinating adducts. (jcancer.org)
  • Successive petroleum ether, methanol, benzene and aqueous extracts of Shorea robusta resin were tested for their phytochemical constituents, antibacterial and antifungal activity. (scielo.org.mx)
  • and 3,5-dibromo-2-(2,4-dibromophenoxy)phenol, a natural compound and a potential metabolite of polybrominated diphenyl ethers. (nih.gov)
  • The term "crown" refers to the resemblance between the structure of a crown ether bound to a cation, and a crown sitting on a person's head. (wikipedia.org)
  • The denticity of the polyether influences the affinity of the crown ether for various cations. (wikipedia.org)
  • The smallest crown ether still capable of binding cations is 8-crown-4, with the largest experimentally confirmed crown ether being 81-crown-27. (wikipedia.org)
  • In 1967, Charles Pedersen, who was a chemist working at DuPont, discovered a simple method of synthesizing a crown ether when he was trying to prepare a complexing agent for divalent cations. (wikipedia.org)
  • Hereby, the cation selectivity for alkali metal ions is mainly dependent on the size and charge density of the ion and the cavity size of the crown ether. (wikipedia.org)
  • Affinities of a given crown ether towards the cations of lithium, sodium, and potassium can change by multiple magnitudes, which is attributed to the high differences in their charge density. (wikipedia.org)
  • The first number in the name of a crown ether refers to the number of atoms in the cycle, and the second number refers to the number of those atoms that are oxygen . (newworldencyclopedia.org)
  • 1,2,3,4-TCDD has been prepared by refluxing a mixture of catechol, potassium carbonate, pentachloronitro benzene and acetone in nitrogen (IARC 1977). (cdc.gov)
  • The cleavage of the ether bonds, which are abundant in the molecular structure of lignin, can be realised in near-critical water (573 to 673 K, 20 to 30 MPa). (hindawi.com)
  • Although it does not influence the cleavage of ether bonds, RANEY Nickel favours the production of phenol from both lignin and catechol. (hindawi.com)
  • By cleavage of the ether bonds, aromatic monomers are formed. (hindawi.com)
  • The cleavage of α-ether linkages rapidly occurs under mildly acidic reaction conditions, resulting in lower molecular weight lignin fragments. (ncsu.edu)
  • In hardwood species, the S/G ratio has been successfully correlated to the amount of β-O-4 ether linkages present in the lignin and the ease of pulping reactions. (ncsu.edu)
  • An amorphous, catechol-based analogue of PEEK ("o-PEEK") has been prepared by a classical step-growth polymerization reaction between catechol and 4,4'-difluorobenzophenone and shown to be readily soluble in a range of organic solvents. (reading.ac.uk)
  • Polymers formed from the functionalized unsymmetrical aromatic ether diacids are expected to have controllable degradation profiles, enabling them to release an active component over a desired time range. (google.com.au)
  • Catechol was converted to catechol diacetate, followed by a Fries rearrangement which produced 3,4-dihydroxyacetophenone(VI). (nii.ac.jp)
  • Crown ethers are not the only macrocyclic ligands that have affinity for the potassium cation. (wikipedia.org)
  • Monooxygenases may be used to hydroxylate and remove benzene, but since phenol, the monohydroxylated product, is also listed as a priority pollutant, double hydroxylation of benzene to catechol is more efficient for combining bioremediation and biocatalysis. (asm.org)
  • The catechol monoallyl ether on Claisen rearrangement gives both the 3- and 4-allylcatechols in 55 and 45% yields respectively. (erowid.org)
  • Photochemical rearrangement of catechol monoallyl ether in isopropanol solution under ultraviolet light for 120 h gives 3- and 4-allylcatechols, each in 25% yield. (erowid.org)
  • The catechol monoallyl ether on rearrangement gave 3- and 4-allylcatechols while the diallyl ether gave only 3,6-diallylcatechol. (erowid.org)
  • It can safely be presumed that a part of the rearrangement proceeds counter-clockwise by the ortho mechanism as for catechol monoallyl ether, thereby yielding the expected 3-allylcatechol ( VIII ). (erowid.org)
  • Pedersen particularly popularized the dibenzo crown ethers. (wikipedia.org)
  • Structures of common crown ethers: 12-crown-4, 15-crown-5, 18-crown-6, dibenzo-18-crown-6, and diaza-18-crown-6. (newworldencyclopedia.org)
  • The most common crown ethers are cyclic oligomers of ethylene oxide, the repeating unit being ethyleneoxy, i.e. (wikipedia.org)
  • The most common crown ethers are oligomers of ethylene oxide, the repeating unit being ethyleneoxy (-CH 2 CH 2 O-). Important members of this series are the tetramer (n = 4, or four ethyleneoxy units), the pentamer (n = 5), and the hexamer (n = 6). (newworldencyclopedia.org)
  • Benzocrown ether groups were produced by anchoring catechol to the CMS resin and subsequent reaction with a,codichloropoly(ethylene glycol). (edu.au)
  • Pedersen shared the 1987 Nobel Prize in Chemistry for the discovery of the synthetic routes to, and binding properties of, crown ethers. (wikipedia.org)
  • The resulting cations often form salts that are soluble in nonpolar solvents, and for this reason crown ethers are useful in phase transfer catalysis. (wikipedia.org)
  • When ammonia can no longer be detected (note 8), dilute the reaction mixture with an equal amount of ether. (docplayer.net)
  • The yield of catechol and phenol can be even increased by applying an acidic or a basic environment [ 11 ]. (hindawi.com)
  • o-PEEK has also been obtained by entropy-driven ring-opening polymerization of the macrocyclic oligomers (MCO's) formed by cyclo-condensation of catechol with 4,4'-difluorobenzophenone under pseudo-high-dilution conditions. (reading.ac.uk)
  • Due to the chelate effect and macrocyclic effect, crown ethers exhibit stronger affinities for diverse cations than their divided or acyclic analogs. (wikipedia.org)
  • Pyrolysis behaviors of guaiacyl glycerol-β-guaiacyl ether were investigated by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The thermal behavior and the evolution profiles of major volatile fragments from the guaiacyl glycerol-β-guaiacyl ether pyrolysis were evaluated. (ncsu.edu)
  • Aza-crowns" consist of crown ethers wherein an ether oxygen has been replaced by an amine group. (newworldencyclopedia.org)