Ether: 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.EthersEthyl EthersHalogenated Diphenyl Ethers: Compounds that contain two halogenated benzene rings linked via an OXYGEN atom. Many polybrominated diphenyl ethers are used as FLAME RETARDANTS.Phenyl Ethers: Ethers that are linked to a benzene ring structure.Crown Ethers: 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.Phospholipid Ethers: 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.Glyceryl Ethers: 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.Methyl Ethers: A group of compounds that contain the general formula R-OCH3.Ethylene Glycols: 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.Polybrominated Biphenyls: Biphenyl compounds which are extensively brominated. Many of these compounds are toxic environmental pollutants.Flame Retardants: Materials applied to fabrics, bedding, furniture, plastics, etc. to retard their burning; many may leach out and cause allergies or other harm.Bis(Chloromethyl) Ether: A substance that is an irritant to the eyes and respiratory tract and may be carcinogenic.Ethers, Cyclic: Compounds of the general formula R-O-R arranged in a ring or crown formation.Plasmalogens: 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.tert-Butyl AlcoholVinyl CompoundsHydrocarbons, BrominatedMolecular 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.Stereoisomerism: 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)Chromatography, Gas: Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.AcetalsCyclization: Changing an open-chain hydrocarbon to a closed ring. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)Gas Chromatography-Mass Spectrometry: A microanalytical technique combining mass spectrometry and gas chromatography for the qualitative as well as quantitative determinations of compounds.Chromatography, Thin Layer: Chromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel, silicates, charcoals, or cellulose. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Alkenes: Unsaturated hydrocarbons of the type Cn-H2n, indicated by the suffix -ene. (Grant & Hackh's Chemical Dictionary, 5th ed, p408)Solvents: Liquids that dissolve other substances (solutes), generally solids, without any change in chemical composition, as, water containing sugar. (Grant & Hackh's Chemical Dictionary, 5th ed)Gasoline: Volative flammable fuel (liquid hydrocarbons) derived from crude petroleum by processes such as distillation reforming, polymerization, etc.Kinetics: The rate dynamics in chemical or physical systems.Time Factors: Elements of limited time intervals, contributing to particular results or situations.Methods: A series of steps taken in order to conduct research.Boranes: The collective name for the boron hydrides, which are analogous to the alkanes and silanes. Numerous boranes are known. Some have high calorific values and are used in high-energy fuels. (From Grant & Hackh's Chemical Dictionary, 5th ed)Environmental Pollutants: Substances or energies, for example heat or light, which when introduced into the air, water, or land threaten life or health of individuals or ECOSYSTEMS.EstersModels, Biological: Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.Reproducibility of Results: The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.Magnetic Resonance Spectroscopy: Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).Glycols: A generic grouping for dihydric alcohols with the hydroxy groups (-OH) located on different carbon atoms. They are viscous liquids with high boiling points for their molecular weights.Alcohols: Alkyl compounds containing a hydroxyl group. They are classified according to relation of the carbon atom: primary alcohols, R-CH2OH; secondary alcohols, R2-CHOH; tertiary alcohols, R3-COH. (From Grant & Hackh's Chemical Dictionary, 5th ed)Chromatography, High Pressure Liquid: Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.Glycerides: GLYCEROL esterified with FATTY ACIDS.Epoxy Compounds: Organic compounds that include a cyclic ether with three ring atoms in their structure. They are commonly used as precursors for POLYMERS such as EPOXY RESINS.Sensitivity and Specificity: Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)Indicators 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)Methoxyflurane: An inhalation anesthetic. Currently, methoxyflurane is rarely used for surgical, obstetric, or dental anesthesia. If so employed, it should be administered with NITROUS OXIDE to achieve a relatively light level of anesthesia, and a neuromuscular blocking agent given concurrently to obtain the desired degree of muscular relaxation. (From AMA Drug Evaluations Annual, 1994, p180)Furans: Compounds with a 5-membered ring of four carbons and an oxygen. They are aromatic heterocycles. The reduced form is tetrahydrofuran.Mass Spectrometry: An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.PropaneFatty Alcohols: Usually high-molecular-weight, straight-chain primary alcohols, but can also range from as few as 4 carbons, derived from natural fats and oils, including lauryl, stearyl, oleyl, and linoleyl alcohols. They are used in pharmaceuticals, cosmetics, detergents, plastics, and lube oils and in textile manufacture. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)Silanes: Compounds similar to hydrocarbons in which a tetravalent silicon atom replaces the carbon atom. They are very reactive, ignite in air, and form useful derivatives.Chloroform: A commonly used laboratory solvent. It was previously used as an anesthetic, but was banned from use in the U.S. due to its suspected carcinogenicity.Catalysis: The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction.KetonesChemistry: A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.Alkanes: The generic name for the group of aliphatic hydrocarbons Cn-H2n+2. They are denoted by the suffix -ane. (Grant & Hackh's Chemical Dictionary, 5th ed)Structure-Activity Relationship: 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.Biodegradation, Environmental: Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.Algorithms: A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.Chemical Phenomena: The composition, conformation, and properties of atoms and molecules, and their reaction and interaction processes.Models, Chemical: Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.Molecular Sequence Data: 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.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.Oximes: Compounds that contain the radical R2C=N.OH derived from condensation of ALDEHYDES or KETONES with HYDROXYLAMINE. Members of this group are CHOLINESTERASE REACTIVATORS.Surface-Active Agents: Agents that modify interfacial tension of water; usually substances that have one lipophilic and one hydrophilic group in the molecule; includes soaps, detergents, emulsifiers, dispersing and wetting agents, and several groups of antiseptics.Dihematoporphyrin Ether: The purified component of HEMATOPORPHYRIN DERIVATIVE, it consists of a mixture of oligomeric porphyrins. It is used in photodynamic therapy (HEMATOPORPHYRIN PHOTORADIATION); to treat malignant lesions with visible light and experimentally as an antiviral agent. It is the first drug to be approved in the use of PHOTODYNAMIC THERAPY in the United States.Propylene Glycols: Derivatives of propylene glycol (1,2-propanediol). They are used as humectants and solvents in pharmaceutical preparations.Plant Extracts: Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.Temperature: The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.Hydrogen-Ion Concentration: The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Computer Simulation: Computer-based representation of physical systems and phenomena such as chemical processes.Phospholipids: Lipids containing one or more phosphate groups, particularly those derived from either glycerol (phosphoglycerides see GLYCEROPHOSPHOLIPIDS) or sphingosine (SPHINGOLIPIDS). They are polar lipids that are of great importance for the structure and function of cell membranes and are the most abundant of membrane lipids, although not stored in large amounts in the system.Acetates: Derivatives of ACETIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the carboxymethane structure.Polyethylene Glycols: Polymers of ETHYLENE OXIDE and water, and their ethers. They vary in consistency from liquid to solid depending on the molecular weight indicated by a number following the name. They are used as SURFACTANTS, dispersing agents, solvents, ointment and suppository bases, vehicles, and tablet excipients. Some specific groups are NONOXYNOLS, OCTOXYNOLS, and POLOXAMERS.Water: A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Solubility: The ability of a substance to be dissolved, i.e. to form a solution with another substance. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Bromine: A halogen with the atomic symbol Br, atomic number 36, and atomic weight 79.904. It is a volatile reddish-brown liquid that gives off suffocating vapors, is corrosive to the skin, and may cause severe gastroenteritis if ingested.Guaifenesin: An expectorant that also has some muscle relaxing action. It is used in many cough preparations.ButanesHydrocarbons, HalogenatedCissus: A plant genus of the family VITACEAE. Cissus rufescence gum is considered comparable to TRAGACANTH.Chondrodysplasia Punctata, Rhizomelic: An autosomal recessive form of CHONDRODYSPLASIA PUNCTATA characterized by defective plasmalogen biosynthesis and impaired peroxisomes. Patients have shortened proximal limbs and severely disturbed endochondral bone formation. The metabolic defects associated with the impaired peroxisomes are present only in the rhizomelic form of chondrodysplasia punctata. (From Scriver et al, Metabolic Basis of Inherited Disease, 6th ed, p1497)Methanol: A colorless, flammable liquid used in the manufacture of FORMALDEHYDE and ACETIC ACID, in chemical synthesis, antifreeze, and as a solvent. Ingestion of methanol is toxic and may cause blindness.Anesthetics: Agents that are capable of inducing a total or partial loss of sensation, especially tactile sensation and pain. They may act to induce general ANESTHESIA, in which an unconscious state is achieved, or may act locally to induce numbness or lack of sensation at a targeted site.Dose-Response Relationship, Drug: The relationship between the dose of an administered drug and the response of the organism to the drug.Egtazic Acid: A chelating agent relatively more specific for calcium and less toxic than EDETIC ACID.Phosphines: Inorganic or organic compounds derived from phosphine (PH3) by the replacement of H atoms. (From Grant & Hackh's Chemical Dictionary, 5th ed)Rabbits: The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.Aldehydes: Organic compounds containing a carbonyl group in the form -CHO.Lipids: A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed)Oxidation-Reduction: 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).Alkynes: Hydrocarbons with at least one triple bond in the linear portion, of the general formula Cn-H2n-2.Molecular Conformation: The characteristic three-dimensional shape of a molecule.Allyl CompoundsPhenols: Benzene derivatives that include one or more hydroxyl groups attached to the ring structure.Spectrophotometry, Ultraviolet: Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Teratogens: An agent that causes the production of physical defects in the developing embryo.Halogenation: Covalent attachment of HALOGENS to other compounds.Spectrophotometry, Infrared: Spectrophotometry in the infrared region, usually for the purpose of chemical analysis through measurement of absorption spectra associated with rotational and vibrational energy levels of molecules. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Species Specificity: The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.CyclopropanesWater Pollutants, Chemical: Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.Base Sequence: The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.Phosphatidylcholines: Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids.Polychlorinated Biphenyls: Industrial products consisting of a mixture of chlorinated biphenyl congeners and isomers. These compounds are highly lipophilic and tend to accumulate in fat stores of animals. Many of these compounds are considered toxic and potential environmental pollutants.Biotransformation: 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.Agrocybe: A genus of saprobic mushrooms in the family Bolbitiaceae that grow in grass, dung, garden mulch, or in woods.Cattle: Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.Phosphatidylethanolamines: Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to an ethanolamine moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and ethanolamine and 2 moles of fatty acids.Organosilicon Compounds: Organic compounds that contain silicon as an integral part of the molecule.Models, Theoretical: Theoretical representations that simulate the behavior or activity of systems, processes, or phenomena. They include the use of mathematical equations, computers, and other electronic equipment.Liver: A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances.Models, Molecular: Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.Mathematics: The deductive study of shape, quantity, and dependence. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Spectrometry, Mass, Electrospray Ionization: A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry.Propanols: Isomeric forms and derivatives of PROPANOL (C3H7OH).Environmental Monitoring: The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.Hematoporphyrins: Iron-free derivatives of heme with 4 methyl groups, 2 hydroxyethyl groups and 2 propionic acid groups attached to the pyrrole rings. Some of these PHOTOSENSITIZING AGENTS are used in the PHOTOTHERAPY of malignant NEOPLASMS.Palladium: A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.Halothane: A nonflammable, halogenated, hydrocarbon anesthetic that provides relatively rapid induction with little or no excitement. Analgesia may not be adequate. NITROUS OXIDE is often given concomitantly. Because halothane may not produce sufficient muscle relaxation, supplemental neuromuscular blocking agents may be required. (From AMA Drug Evaluations Annual, 1994, p178)Hydrocarbons, FluorinatedCalibration: Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
... simple ether > halide = amine > imidazolium (which is totally inactive). Identification of features common to the most ...
The simplest sulfoxide, dimethyl sulfoxide, is a common solvent; a common sulfone is sulfolane. Sulfonic acids are used in many ... Thioethers are the sulfur analogs of ethers. Sulfonium ions have three groups attached to a cationic sulfur center. ...
The simplest methoxy compounds are methanol and dimethyl ether. Other methoxy ethers include anisole and vanillin. Many metal ... Cheung, Chi Wai; Buchwald, Stephen L. (2 August 2013). "Mild and General Palladium-Catalyzed Synthesis of Methyl Aryl Ethers ...
"Complexation of diphenylzinc with simple ethers. Crystal structures of the complexes Ph2Zn·glyme and Ph2Zn·diglyme". J. ...
1275 - Ramon Llull discovers diethyl ether. c. 1275 - The verge escapement, a simple type of escapement used in clocks, is ...
He also discovers diethyl ether. The era of the tosafot (medieval commentators on the Talmud) ends (it began in 1100). John II ... The verge escapement, a simple type of escapement used in clocks, is invented (exact year unknown). Ramon Llull establishes a ...
It is the simplest cyanohydrin and it is derived from formaldehyde. It is a colourless liquid that dissolves in water and ether ...
This colorless liquid has a pleasant ether-like odor. It is miscible with water. The molecule is bifunctional, consisting of ... 2-Chloroethanol is an chemical compound with the formula HOCH2CH2Cl and the simplest chlorohydrin. ...
... is a simple vinyl halide. It is soluble in chloroform, ethanol, diethyl ether, tetrahydrofuran, acetone and ...
It is the simplest diazo compound. In the pure form at room temperature, it is an extremely sensitive explosive yellow gas; ... For safety and convenience diazomethane is always prepared as needed as a solution in ether and used as such. It converts ... When diazomethane reacts with alcohols or phenols in presence of boron trifluoride (BF3), methyl ethers are obtained. ... thus, it is almost universally used as a solution in diethyl ether. The compound is a popular methylating agent in the ...
... ether) (lit. (270) [α]25D + 82.1° (c 1.0, ether)). The purity determined by 1H NMR was > 99%. 1H NMR (CDCl3/TMS): δ 1.64 (d, J ... Simple aryl ketones are reduced enantioselectively when a chiral amino alcohol ligand is employed. (9) Transition metal ... Oxazaborolidines remain in common use for reductions of simple ketones. More recently, efforts in the field of enantioselective ... 11) Microorganisms reduce certain classes of simple ketones with extremely high enantioselectivity. Baker's yeast is the most ...
The first simple enzyme mimics were based on crown ether and cryptand. In 1976, less than ten years after the discovery of ... developed a functionalized binapthyl crown ether that catalyze transacylation. The catalyst makes use the crown ether motif's ... The rate of the reaction is catalyzed 120 times faster, and unlike a hydrolysis by simple base NaOH that gives a 1:1 mixture of ... A notable example of catalysts that employ this mechanism is Jean-Marie Lehn's crown ether. In addition, catalysts based on ...
I. Trimethylsilanol and its simple ethers", J. Am. Chem. Soc. 66 (10): pp. 1707-1710, doi:10.1021/ja01238a030 R.O. Sauer, R.H. ... Tris(trimethylsilyl)amine is the simplest tris(trialkylsilyl)amine which are having the general formula (R3Si)3N, in which all ...
A simple adduct BHMe3.N3 is formed from tetramethyldiborane and ammonia in ether. This also forms during the thermal ... Dimethylborane, (CH3)2BH is the simplest dialkylborane, consisting of a methyl group substituted for a hydrogen in borane. As ... Dimethylborane reacts with alkenes with the highest yield in ether to produce a dimethylalkylborane. The dimethylalkylboranes ... Controlled and sequential hydroboration of simple representative alkenes with methylborane in tetrahydrofuran. An examination ...
Both isomers are soluble in simple alcohols, ethers, and chloroform. 2-Naphthol is a widely used intermediate for the ...
Both isomers are soluble in simple alcohols, ethers, and chloroform. They are precursors to a variety of useful compounds. ...
Even simple organic compounds, such as phenols, exhibit ionophoric properties. The majority of synthetic receptors used in the ... Many synthetic ionophores are based on crown ethers, cryptands, and calixarenes. These synthetic species are often macrocyclic ... carrier-based anion-selective electrodes employ transition elements or metalloids as anion carriers, although simple organic ...
A simple description is Ce4+N3− (e-) but the interatomic distances are a better match for the trivalent state rather than for ... Many of the iodides form soluble complexes with ethers, e.g. TmI2(dimethoxyethane)3. Samarium(II) iodide is a useful reducing ... The simple salts include YbI2, EuI2, and SmI2. The electride-like salts, described as Ln3+, 2I−, e−, include LaI2, CeI2 and ...
The leaves are simple or undulate, covered with stiff hairs. The small radially symmetrical flowers are sapphire blue and ... It is insoluble in water, but soluble in alcohol, chloroform and ether. Anchusa species are used as food plants by the larvae ... The flowers grow in several axillary cymes, simple or branched, or are clustered at the end. The flowers are much frequented by ...
It is a precursor to perfluoro(methyl vinyl ether) (CF2=CFOCF3) and perfluoro(propyl vinyl ether) are used as a comonomers with ... Thus tetrafluoroethyene oxide and hexafluoropropylene oxide are two of the simplest cyclic perfluoroethers. ... The ether groups are integral to the polymer chain. Nafion is a perfluorinated polyether with pendant sulfonic acid groups ( ... In these materials, the ether groups are pendant from the polymer backbone. Krytox is a grease generated by the polymerization ...
It is the simplest example of a ketoxime. It is a white crystalline solid that is soluble in water, ethanol, ether, chloroform ...
In its simplest form, imprinting utilizes only steric interactions, but more complex systems also incorporate hydrogen bonding ... The breakthrough came in the 1960s with the synthesis of the crown ethers by Charles J. Pedersen. Following this work, other ... The template may be as simple as a single metal ion or may be extremely complex. Mechanically interlocked molecular ... The use of crown ether binding with metal or ammonium cations is ubiquitous in supramolecular chemistry. The formation of ...
Zhang, Y.; Li, C. J. (2006). "DDQ-Mediated Direct Cross-Dehydrogenative-Coupling (CDC) between Benzyl Ethers and Simple Ketones ...
However, by the simple addition of a methylene bridge between the 1 and 6 positions, a stable, flat, aromatic molecule can be ... Specifically, they studied the ring closing of 5 to 10 carbon cyclic ethers. They found that as the number of carbons increased ... Transannular strain can be eliminated by the simple addition of a carbon bridge. E,Z,E,Z,Z-[10]-annulene is quite unstable; ... Transannular strain can also be demonstrated in other cyclo-organic molecules, such as lactones, lactams, ethers, cycloalkenes ...
Simple epoxides are often referred to as oxides. Thus, the epoxide of ethylene (C2H4) is ethylene oxide (C2H4O). Many compounds ... An epoxide is a cyclic ether with a three-atom ring. This ring approximates an equilateral triangle, which makes it strained, ... It is a variant of the Williamson ether synthesis. In this case, an alkoxide ion intramolecularly displaces chloride. The ... and hence highly reactive, more so than other ethers. They are produced on a large scale for many applications. In general, low ...
Witte, Helmut; Seeliger, Wolfgang (1972). "Simple Synthesis of 2-Substituted 2-Oxazolines and 5,6-Dihydro-4H-1,3-oxazines". ... Kobayashi, Shiro; Uyama, Hiroshi (15 January 2002). "Polymerization of cyclic imino ethers: From its discovery to the present ... Vorbrüggen, Helmut; Krolikiewicz, Konrad (1993). "A simple synthesis of Δ2-oxazines, Δ2-oxazines, Δ2-thiazolines and 2- ...
The Global and Chinese Propylene Glycol MonoEthyl Ether Industry, 2011-... ... 150 Pages Report] Check for Discount on 2016 Propylene Glycol MonoEthyl Ether (CAS 52125-53-8) Industry Market Report report by ... It is the simplest primary amine. It is sold as a solution in methanol, ethanol, ... ... 1.2 Development of Propylene Glycol MonoEthyl Ether Industry 1.3 Status of Propylene Glycol MonoEthyl Ether Industry Chapter ...
The Global and Chinese Ethylene Glycol Monomethyl ether(EM) Industry,... ... 150 Pages Report] Check for Discount on 2016 Ethylene Glycol Monomethyl ether(EM) (CAS 109-86-4) Industry Market Report report ... It is the simplest primary amine. It is sold as a solution in methanol, ethanol, ... ... 1.2 Development of Ethylene Glycol Monomethyl ether(EM) Industry 1.3 Status of Ethylene Glycol Monomethyl ether(EM) Industry ...
In 1967, Charles Pedersen, a chemist working at DuPont, discovered a simple method of synthesizing a crown ether when he was ... 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. ...
Diethyl ether is a clear liquid chemical. It is often just called ether. Ether burns very easily and boils at about 35°C. It ... Ether is used as a solvent by scientists for chemical reactions. People used to take ether as a recreational drug (drugs used ... It became illegal to sell ether in Poland in 1923. Ether is made as a byproduct when ethanol is made, so it is not very ... or inhale the fumes given off by pure or nearly pure ether. This could have addicted these people to the ether if they did that ...
... the oxidation mechanisms of peroxidizable compounds like ethers reported in the literature ar ... such as ethers, spontaneously form unstable peroxides through a self-propagating process of autoxidation (peroxidation). ... diethyl ether. : a complex process for a simple molecule S. Di Tommaso, P. Rotureau, O. Crescenzi and C. Adamo, Phys. Chem. ... Oxidation mechanism of diethyl ether: a complex process for a simple molecule† ...
Simple NCBI Directory. *. Getting Started. *NCBI Education. *NCBI Help Manual. *NCBI Handbook ... Rac and Rho mediate opposing hormonal regulation of the ether-a-go-go-related potassium channel.. Storey NM1, OBryan JP, ... ether-a-go-go-related potassium channels (ERG) in a rat pituitary cell line, GH(4)C(1). The hypothalamic neuropeptide, ...
Simple NCBI Directory. *. Getting Started. *NCBI Education. *NCBI Help Manual. *NCBI Handbook ... Ether cont1.42, whole genome shotgun sequence Brucella melitensis bv. 3 str. Ether cont1.42, whole genome shotgun sequence. gi, ...
Approaching the product with a "package" ethos, Aether engineered a simple player that contains all the components to deliver ... Find the Aether Cone in Black + Copper or White + Silver for $399 at the Aether store. ... With the simple interface all you do is turn the front mounted wheel once to change to a similar song or give it a big spin to ... A new simple, elegant speaker that focuses on a seamless listening experience. Posted by Greg Stefano ...
Simple ethers or symmetrical ethers; e.g., diethyl ether, dimethyl ether, etc. ... For the substance whose common name is ether, see Diethyl ether. For other uses of ether or aether, see Aether (disambiguation) ... IUPAC rules are often not followed for simple ethers. The trivial names for simple ethers (i.e., those with none or few other ... Important ethers[edit]. Ethylene oxide Also the simplest epoxide. Dimethyl ether An aerosol spray propellant. A potential ...
Canadas contact tracing app simple to use, but missing key features: security expert. Yahoo Finance Canada ... Profitable ether addresses have grown by a hefty 132% since last July. In the last week, ether has established a foothold above ... The numbers indicate many took advantage of the opportunity to buy ether under $300, resulting in almost 18 million more in- ... The Securities and Exchange Commission appears to be interested in Binances eponymous blockchain, 132% of ether wallets are in ...
Its that simple.. Back to Table of Contents. #BreakingBads lessons for publishing: 1)Care about process, 2)Produce the best ... This column, Ether for Authors, appears here at Publishing Perspectives on Tuesdays. Andersons Writing on the Ether is read on ... Ether for Authors: Are These the Dog Days of the Disruption?. In Discussion by Porter Anderson. August 27, 2013. ... His all-new London on the Ether for The Bookseller was inaugurated during the London Book Fair. More about him is at ...
Was it Ether or Chloroform. Ancestry of the British Queen. Baggage of a Man of Simple Habits. ...
How does all of this affect you? Simple. If it can be done to one of us it can be done to all of us. Someday your company, for ...
Crystal Structure of the Estrogen Receptor Alpha Ligand Binding Domain Complexed to an Ether Estradiol Compound. ... A simple quality factor, calculated as. 1/resolution - R-value *Deposition date (newer structures have higher ranks) ...
The Relations of Matter and Ether. A Simple Conception of the Evolution of Matter ...
It is a rather simple 4-5 dB boost in the lower spectrum, 500Hz and below. Without the bass boost, I feel the lower end is a ... The Aether R is some kind of raw and fun but more refined than the classic Aether. In the end Aether R surely has the same toe- ... The Aether R seams to be more serious. Like the youngster (Ather classic) has grown up but you can see the child in his (Aether ... Both EST12 and Aether R have a clean lower midrange where EST12 has a more neutral character whereas Aether R has a slight dip ...
9. Derived simple ether under item 1, representing soboli, including the active ingredient is a derivative of a simple ... 5. Derived simple ether under item 1, where a is a group represented by Q-1, Q-3 or Q-5 or R2, R3and R4are hydrogen; and m is 0 ... 2. Derivatives of simple ether under item 1, where E is a group of General formula. < / BR>. where R12and n are defined above. ... ethers, such as diethyl ether, diisopropyl ether, 1,2-diethoxyethane, tetrahydrofuran and dioxane; polar solvents such as N,N- ...
Modified Starch Ether,PVA-Polyvinyl Alcohol Powder,Redispersible Powder,Silicone Wat - Cellulose Ether,HPMC,Superplasticizer, ... Michem is supplier and manufacturer of Cellulose Ether,Polypropylene Fiber,Redispersible Powder,Superplasticizer,Redispersible ... Its simple and easy.. * Step 1: Simply copy One of the bellow HTML Code and paste into your websites first homepage:. Text ... Cellulose Ether HPMC Superplasticizer Gypsum Retarder Manufacturer--Michem Description: Michem is supplier and manufacturer of ...
aether 0.1.1 Simple wrapper over Ridley gem (a Chef API client) ...
To what family does the molecule belong? a. carboxylic acid b. alcohol c. ether d. ester Chemistry In Focus ... A simple ion that can be formed by the given element, chlorine, is Cl. −. (chloride ion) by gaining an electron which is shown ... A simple ion that can be formed by the given element is to be stated. The noble gas that has an analogous configuration to the ... A simple ion that can be formed by the given element is to be stated. The noble gas that has an analogous configuration to the ...
... simple ether > halide = amine > imidazolium (which is totally inactive). Identification of features common to the most ...
Simple ethers or symmetrical ethers; e.g., diethyl ether, dimethyl ether, etc. Mixed ethers or unsymmetrical ethers; e.g., ... Lower ethers also act as anaesthetics. Ethers are good organic solvents. Simple ethers (such as diethyl ether) are tasteless. ... IUPAC rules are often not followed for simple ethers. The trivial names for simple ethers (i.e., those with none or few other ... then it is a simple or symmetrical ether, whereas if they are different, the ethers are called mixed or unsymmetrical ethers. A ...
A bolaamphiphilic low-molecular-weight gelator based on crown ether, which could self-assemble into organogels and hydrogels, ... A simple framework (crown ether-hydrophobic ... A simple framework (crown ether-hydrophobic linkage-ammonium ... Construction of supramolecular organogels and hydrogels from crown ether based unsymmetric bolaamphiphiles L. Gao, D. Xu and B ... A bolaamphiphilic low-molecular-weight gelator based on crown ether, which could self-assemble into organogels and hydrogels, ...
Ether, , ,-+ IPv4 Packets , , , ,-,,MACIn,--,, , , , , , , , , ,-----,IPv6 Packets , , ,Ether, +-----+ +---+ , , ,PHY , Ether ... GenericScheduler This is a preliminary generic scheduler LFB for abstracting a simple scheduling process. 5.5.2.1. Data ... Ether, +------+ ,PHY , +------+ ,Cop , , , ,LFB ,EtherPHYOut , Ether, to some LFB(s) that , ,---------------,, MACIn ... Ether, +------+ , ,PHY , , ,Cop , +---+ , ,#1 , +-----+ , ,-----,IPv6 Packets , , , , , , , , , , ,Ether, , , IPv4 Packets ...
Using some simple geometry,. boat 1 must have a speed moving from A to B, and an identical speed for the return trip. We ... There is no "aether" which light propagates in, so there is no "relative velocity with respect to the aether" to be measured. ... m/s was fixed with respect to the aether. That is, an observer at rest in the aether would see all light waves traveling at , ... Michelson-Morley failed to show a shift because there is no aether wind on the surface of planet earth - the aether is present ...
  • In response, theoreticians produced more and more "patches" to the aether theory, until at last Einstein published his special theory of relativity, which eliminated the need for an aether and in fact suggested that the idea of an aether was incompatible with the experimental evidence. (skullsinthestars.com)
  • Yet the possibility of a dynamic type of aether is a stronger possibility today than it was in the 1920's when the idea of an aether was abandoned and Einstein's relativity theories came to the fore. (thenakedscientists.com)
  • Unfortunately of the two possibilities, the enormous influence of Maxwell's work with electromagnetic radiation took foremost importance in everyone's mind and since his equations seemed to indicate that an aether was not needed for the propagation of light, the idea of an aether was abandoned. (thenakedscientists.com)
  • Of course the old concept of a stationary, extremely stiff aether such as is described in the luminiferous aether theories, has been disproved beyond any reasonable doubt by the Michelson-Morley experiment, which also led to new proof of the constancy of the speed of light in a vacuum, similarly aetherosphere theories, wherein the aether exists in a small pocket around the earth are also unrealistic and defunct. (thenakedscientists.com)
  • In the late 19th century, " luminiferous aether " (or " ether "), meaning light-bearing aether , was the term used to describe a medium for the propagation of light . (thefullwiki.org)
  • Traditionally, chemists make ethers using the Williamson synthesis, which involves an oxygen nucleophile attacking a carbon center to kick off a leaving group through an S N 2 type mechanism. (acs.org)
  • In fact, the reaction of alkoxides with alkyl halides or alkyl sulfates is an important general method for the preparation of ethers, and is known as the Williamson synthesis. (omicsonline.org)
  • Indeed, ethers have boiling points about the same as those of alkanes of comparable molar mass and much lower than those of the corresponding alcohols (Table 18.1.2). (libretexts.org)
  • A bolaamphiphilic low-molecular-weight gelator based on crown ether, which could self-assemble into organogels and hydrogels, was prepared. (rsc.org)
  • A simple framework (crown ether-hydrophobic linkage-ammonium salt) was proposed. (rsc.org)
  • The Aether/Ariel Pro was new for spring 2018, and Osprey kindly sent me it and two other packs that it had updated or launched that season, the Exos and Levity. (andrewskurka.com)
  • Oxygen is more electronegative than carbon, thus the hydrogens alpha to ethers are more acidic than in simple hydrocarbons. (wikipedia.org)
  • The difference in the boiling points of the ethers and their isomeric alcohols becomes lower as the carbon chains become longer, as the van der Waals interactions of the extended carbon chain dominates over the presence of hydrogen bonding. (wikipedia.org)
  • 2. The polymer of claim 1 wherein the fluorovinyl ether is copolymerized with one more comonomers that is a fluorinated compound having at least one polymerizable carbon-carbon double bond. (google.com)
  • the simplest hydrocarbon (called methane)contains a single carbon atom bonded to four hydrogen atoms: Methane: A carbon atom bonded to 4 hydrogen atoms But carbon can bond to other carbon atoms in addition tohydrogen, as illustrated in the molecule ethane below: Ethane: A carbon-carbon bond In fact, the uniqueness of carbon comes from the fact thatit can bond to itself in many different ways. (slideshare.net)
  • An organic molecule in which an oxygen atom is bonded to two carbon atoms through two sigma bonds is known as an ether . (britannica.com)
  • Although ethers contain two polar carbon-oxygen bonds, they are much less reactive than alcohols or phenols. (britannica.com)
  • Likewise, locator numbers are omitted for the simple dialdehyde at the bottom left, since aldehyde functions must occupy the ends of carbon chains. (msu.edu)
  • One of the most fascinating aspects of 19th century physics is that many remarkable ideas and ingenious experiments were motivated by a physical hypothesis which we now know to be incorrect: namely, the aether. (skullsinthestars.com)
  • In 'classical' physics (as distinct from 'establishment' physics), aether has always been regarded as a fluid (along with water, oil, electricity and magnetism, etc. (thenakedscientists.com)
  • I don t know what aetheric mechanism WB believes in, ie to create gravity, & to create his aether pressure, but i will briefly describe my mechanism (which is based on Conrad Ranzan's DSSU aether theory)(& Prof Reg Cahill's Process Physics dynamic space theory). (thenakedscientists.com)
  • Ether, in physics, a theoretical universal substance believed during the 19th century to act as the medium for transmission of electromagnetic waves (e.g., light and X-rays), much as sound waves are transmitted by elastic media such as air. (britannica.com)
  • For others who may not normally study science or physics, or even be aware of the work regarding aether theory, a significant effort and time commitment may be required to fully digest the material in this book. (divinecosmos.com)
  • Current theories working with these aether concepts, including "Sequential Physics," "Subquantum Kinetics," "Nonequilibrium Thermodynamics," "General System Theory," "Reciprocal System Theory," "Harmonic Universe Theory," "Maxwell / Whittaker scalar-wave physics" "Hyperdimensional Physics" and any number of "Unified Field Theories," all agree that our physical reality arises from this hidden energy substance, which creates all that we know and see by vibrating. (divinecosmos.com)
  • A Very Important Work From Baumring's Collection Presenting The Pre-Einsteinian Conception Of Aether & Vortex Physics, A Clear Presentation Of Universal Phenomena From The Natural Philosophy School, Not Disproven Or Outdated As The Modern Establishment Wrongly Assumes, Essential For Understanding Theories Of Esoteric Cosmology & Market Forecasting. (sacredscience.com)
  • Therefore, more polar solvents, in particular the green ethers CPME, TAME, and Me-THF, were selected and first considered for the preparation of methionine benzyl ester, previously accomplished in cyclohexane with modest yield. (deepdyve.com)
  • Heterogeneous charge transfer can be divided into ion transfer and electron transfer, while ion transfer can be either simple or assisted by a ligand dissolved in the system. (hindawi.com)
  • in this respect the equations of the aether are much simpler than those of the dynamics of fluid motion, being in fact linear. (wikisource.org)
  • If aether exists, then obviously rotation will centrifuge it, just as happens with any other fluid subjected to rotation. (thenakedscientists.com)
  • In this wealth of new data, the aether fluid is a source of tremendous energy that is in constant vibrational motion, flowing through all objects in the Universe, creating and recreating them every second - just as a candle flame is constantly absorbing new wax and oxygen and radiating new heat and light, but still continues to exist as a measurable "unit. (divinecosmos.com)
  • There is a paucity of data on the efficiency of this method, and the purity of the product so obtained, and this report presents a quantitative evaluation, and comparison to ether obtained via the first method, for the least favourable 25% starter fluid. (sciencemadness.org)
  • Ethers are slightly polar. (wikipedia.org)
  • TSKgel Phenyl-5PW columns are most hydrophobic, followed by Ether-5PW, while the surface of Butyl-NPR columns is most polar or least hydrophobic. (sigmaaldrich.com)
  • We recommend the more polar Ether-5PW column for purifying more hydrophobic proteins. (sigmaaldrich.com)
  • The 'establishment belief' that this is due to the difference in polar and equatorial radii is almost certainly wrong and is mistaking the effect (radii differences) for the real cause (aether pressure differential). (thenakedscientists.com)
  • Silica chloride as an efficient solid acid can serve as an eco-friendly and high-capacity reagent for the deprotection of trimethylsilyl ethers to their corresponding alcohols under mild and heterogeneous conditions. (springer.com)
  • Ethers are common in organic chemistry and even more prevalent in biochemistry, as they are common linkages in carbohydrates and lignin . (wikipedia.org)
  • Schiff's bases andcrown ethers, which feature prominently in supramolecular chemistry, can be used assensing materials in the construction of potentiometric ion selective electrodes. (mdpi.com)
  • I want to get the latest chemistry news from C&EN in my inbox every week. (acs.org)
  • In this study, a composite membrane is formed by blending the sulfonated poly (ether ether ketone) with lignin (SPEEK/lignin), and optimized by tailoring the degree of sulfonation. (frontiersin.org)
  • If extra aether is pulled in by every atom of spinning Earth (pulled in towards Earth's spin-axis) then logically the extra aether must be spat out near Earth's two poles. (thenakedscientists.com)
  • The medium in which the activity occurs is for our present purpose the free aether itself, whose dynamical equations have been definitely ascertained in quite independent ways from consideration of both the optical side and the electrodynamic side of its activity: so that there will be nothing hypothetical in our analysis on that score. (wikisource.org)