An oxime is one in a class of chemical compounds with the general formula R₁R₂CNOH, where R₁ is an organic side chain and R₂ is either hydrogen, forming an aldoxime, or another organic group, forming a ketoxime. A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by Mass. Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6 Nitrogen (ˈnaɪtɹəʤɪn is a Chemical element that has the symbol N and Atomic number 7 and Atomic weight 14 Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 An organic compound is any member of a large class of Chemical compounds whose Molecules contain Carbon. A side chain in Organic chemistry and Biochemistry is a part of a Molecule that is attached to a core structure

Oximes can be formed by the action of hydroxylamine on aldehydes or ketones. Hydroxylamine is a reactive chemical with formula NH2OH It can be considered a hybrid of Ammonia and Water due to parallels it shares An aldehyde is an organic compound containing a terminal Carbonyl group. A ketone (pronounced as key tone) is either the Functional group characterized by a Carbonyl group (O=C linked to two other Carbon atoms or

The term oxime dates to the 19th century, a condensation of the words oxygen and imide. The 19th century of the Common Era began on January 1, 1801 and ended on December 31, 1900, according to the Gregorian calendar Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Organic chemistry In Organic chemistry, imide is a Functional group consisting of two Carbonyl groups bound to Nitrogen.

Oximes exist as two stereoisomers: a syn isomer and an anti isomer. Stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution but which differ in the three dimensional orientations Aldoximes, except for aromatic aldoximes, exist only as a syn isomer, while ketoximes can be separated almost completely and obtained as a syn isomer and an anti isomer.

Contents 1 Chemistry of oximes 1.1 Organic synthesis 1.2 Organic reactions 2 Uses of oximes 3 Amidoximes 4 References

Chemistry of oximes

Organic synthesis

Oximes can be synthesized by condensation of an aldehyde or a ketone with hydroxylamine. A condensation reaction is a Chemical reaction in which two Molecules or moieties ( Functional groups) combine to form one single molecule together with Hydroxylamine is a reactive chemical with formula NH2OH It can be considered a hybrid of Ammonia and Water due to parallels it shares The condensation of aldehydes with hydroxylamine gives aldoxime, and ketoxime is produced from ketones and hydroxylamine. Generally, oximes exist as colorless crystals and do not easily dissolve in water. In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating Therefore, oximes are used for the identification of ketone or aldehyde.

Oximes can also be obtained from reaction of nitrites such as isoamyl nitrite with compounds containing an acidic hydrogen atom. The nitrite Ion is NO2− The anion is bent being Isoelectronic with O3. Amyl nitrite is the Chemical compound with the formula C5H11ONO Examples are the reaction of ethyl acetoacetate and sodium nitrite in acetic acid,^[1][2] the reaction of methyl ethyl ketone with ethyl nitrite in hydrochloric acid. The Organic compound ethyl acetoacetate ( EAA) is the Ethyl Ester of Acetoacetic acid. Sodium nitrite, with Chemical formula Na[[Nitrogen N]] O 2 is used as a Color fixative and Preservative in meats and Acetic acid, also known as ethanoic acid, is an organic chemical compound, giving Vinegar its sour taste Butanone is a manufactured organic chemical. It is a colorless liquid with a sharp sweet butterscotch odor reminiscent of Acetone. Chemistry Other Synonyms Include Ethyl Alcohol Nitrite Nitrous acid ethyl ester nitrethyl Hydrochloric acid is the Solution of Hydrogen chloride ( H[[Chlorine Cl]] in water ^[3] and a similar reaction with propiophenone,^[4] the reaction of phenacyl chloride,^[5] the reaction of malononitrile with sodium nitrite in acetic acid^[6]

A conceptually related reaction is the Japp-Klingemann reaction. Propiophenone is an Aryl Ketone. It is a clear liquid that is insoluble in water but miscible with Methanol, Ethanol, Diethyl ether Malononitrile, also propanedinitrile, is a Nitrile, with formula CH2(CN2 The Japp-Klingemann reaction is a Chemical reaction used to synthesize Hydrazones from β-keto-acids (or β-keto-esters and Aryl Diazonium salts The Reaction

Organic reactions

The hydrolysis of oximes proceeds easily by heating in the presence of various inorganic acids, and the oximes decompose into the corresponding ketones or aldehydes, and hydroxylamines. Hydrolysis is a Chemical reaction during which one or more water molecules are split into hydrogen and hydroxide ions which may go on to participate in further reactions In Computer science, ACID ( Atomicity Consistency Isolation Durability) is a set of properties that guarantee that Database transactions are The reduction of oximes by sodium amalgam or hydrogenation produces amines. Sodium amalgam, commonly denoted Na(Hg is an Amalgam, or Alloy of mercury, with Sodium Metal. Hydrogenation is the Chemical reaction that results in addition of Hydrogen (H2 Amines are Organic compounds and Functional groups that contain a basic Nitrogen Atom with a Lone pair. The reduction of aldoximes gives both primary amines and secondary amines. Redox (shorthand for reduction-oxidation reaction describes all Chemical reactions in which atoms have their Oxidation number ( Oxidation state

Generally oximes can be changed to the corresponding amide derivatives by treatment with various acids. In Chemistry, an amide is one of three kinds of Compounds (sometimes called acid amide the organic Functional group characterized This reaction is called Beckmann rearrangement. The Beckmann rearrangement, named after the German chemist Ernst Otto Beckmann (1853–1923 is an acid-catalyzed rearrangement of an Oxime In this reaction, a hydroxyl group is exchanged with the group that is in the anti position of the hydroxyl group. Hydroxyl in Chemistry stands for a molecule consisting of an Oxygen atom and a Hydrogen atom connected by a Covalent bond. The amide derivatives that are obtained by Beckmann rearrangement can be transformed into a carboxylic acid and an amine by hydrolysis. Carboxylic acids are Organic acids characterized by the presence of a Carboxyl group, which has the formula -C(=OOH usually written -COOH or -CO2H Beckmann rearrangement is used for the industrial synthesis of caprolactam, which is the material used to make nylon-6. Caprolactam is an Organic compound which is a Lactam of 6-aminohexanoic acid (ε-aminohexanoic acid Aminocaproic acid) Overview Nylon is a Thermoplastic silky material first used commercially in a nylon- Bristled Toothbrush (1938 followed more famously by

The Ponzio reaction (1906) ^[7] concerning the conversion of m-nitrobenzaldoxime to m-Nitrophenyldinitromethane with Dinitrogen tetroxide, was the result of research into TNT-like high explosives ^[8]:

In the Neber rearrangement certain oximes are converted to the corresponding alpha-amino ketones. Nitrogen tetroxide ( dinitrogen tetroxide or nitrogen peroxide) is the Chemical compound N2O4 Trinitrotoluene ( TNT) is a Chemical compound with the formula C6H2(NO23CH3 The Neber rearrangement is an Organic reaction in which an Oxime is converted into an alpha-aminoketone in a Rearrangement reaction.

Uses of oximes

Oxime compounds are used as antidotes for nerve agents. A nerve agent inactivates acetylcholinesterase molecules by phosphorylation of the molecule. Oxime compounds can reactivate acetylcholinesterate by attaching to the phosphorus atom and forming an oxime-phosphonate which then splits away from the acetylcholinesterase molecule. The most effective oxime nerve-agent antidotes are pralidoxime, obidoxime, methoxime, HI-6, Hlo-7, 2-PAM, and TMB-4. Pralidoxime belongs to a family of compounds called Oximes ' that bind to Organophosphate -inactivated Acetylcholinesterase. Obidoxime is a member of the Oxime family used to treat Nerve gas poisoning Pralidoxime belongs to a family of compounds called Oximes ' that bind to Organophosphate -inactivated Acetylcholinesterase. ^[9] The effectiveness of the oxime treatment depends on the particular nerve agent used. ^[10] Perillartine, the oxime of perillaldehyde is used as an artificial sweetener in Japan, as it is 2000 times sweeter than sucrose. Perillartine, also known as perillartin and perilla sugar, is a Sweetener that is about 2000 times as sweet as Sucrose. Perillaldehyde, or perilla aldehyde is a natural Organic compound found most abundantly in the annual herb Perilla, but also in a wide variety of other plants Solubility of Pure SucroseTemperature(Cg Salicylaldoxime is a chelator. Salicylaldoxime is a Chemical compound described by the formula C6H4CH=NOH-2-OH Chelation is the binding or complexation of a bi- or multidentate Ligand.

Amidoximes

Amidoximes are oximes of hemiaminals with general structure RC(=NOH)(NRR'). A hemiaminal is a Functional group or type of Chemical compound that has a Hydroxyl group and an Amine attached to the same Carbon Certain amidoximes react with benzenesulfonyl chloride to substituted ureas in the Tiemann rearrangement ^{[11] [12]}

References

1. ^ Hans Fischer (1943). Urea is an Organic compound with the Chemical formula ( N[[hydrogen H]]22 C[[oxygen O]] Hans Fischer ( July 27, 1881 &ndash March 31, 1945) was a German organic chemist and the recipient of the 1930 "2,4-Dimethyl-3,5-dicarbethoxypyrrole". Org. Synth.; Coll. Organic Syntheses is a Scientific journal that since 1921 has provided the Chemistry community with annual collections of detailed and checked procedures Vol. 2: 202.  
2. ^ Hans Fischer (1955). "Kryptopyrrole". Org. Synth.; Coll. Organic Syntheses is a Scientific journal that since 1921 has provided the Chemistry community with annual collections of detailed and checked procedures Vol. 3: 513.  
3. ^ W. L. Semon and V. R. Damerell (1943). "Dimethoxyglyoxime". Org. Synth.; Coll. Organic Syntheses is a Scientific journal that since 1921 has provided the Chemistry community with annual collections of detailed and checked procedures Vol. 2: 204.  
4. ^ Walter H. Hartung and Frank Crossley (1943). "Isonitrosopropiophenone". Org. Synth.; Coll. Organic Syntheses is a Scientific journal that since 1921 has provided the Chemistry community with annual collections of detailed and checked procedures Vol. 2: 363.  
5. ^ Nathan Levin and Walter H. Hartung (1955). "ω-chloroisonitrosoacetophenone". Org. Synth.; Coll. Organic Syntheses is a Scientific journal that since 1921 has provided the Chemistry community with annual collections of detailed and checked procedures Vol. = 3: 191.  
6. ^ J. P. Ferris, R. A. Sanchez, and R. W. Mancuso (1973). "p-toluenesulfonate". Org. Synth.; Coll. Organic Syntheses is a Scientific journal that since 1921 has provided the Chemistry community with annual collections of detailed and checked procedures Vol. 5: 32.  
7. ^ Ponzio, J. prakf chcm , 73, 494 (1906),
8. ^ Aromatic-Aliphatic Nitro Compounds. III. The Ponzio Reaction; 2,4,6-Trinitrobenzyl Nitrate Louis F. Fieser and William von E. Doering J. Am. Chem. Soc.; 1946; 68(11) pp 2252 - 2253; doi:10.1021/ja01215a040
9. ^ Aaron Rowe, New Nerve Gas Antidotes, Wired (magazine), 2007-11-27. William von Eggers Doering (born 22 June 1917 in Fort Worth, Texas) is a Professor Emeritus at Harvard University and the former Chair The Journal of the American Chemical Society (usually abbreviated as J A digital object identifier ( DOI) is a permanent identifier given to an Electronic document. Wired is a full-color monthly American Magazine and on-line periodical published in San Francisco, California since March 1993 Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1095 - Pope Urban II declares the First Crusade at the Council of Clermont
10. ^ Kassa, J. (2002). "Review of oximes in the antidotal treatment of poisoning by organophosphorus nerve agents". Journal of Toxicology — Clinical Toxicology 40: 803. doi:10.1081/CLT-120015840. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.  
11. ^ Ferdinand Tiemann (1891). Johann Karl Wilhelm Ferdinand Tiemann was a German chemist and together with Reimer discoverer of the Reimer-Tiemann reaction. "Ueber die Einwirkung von Benzolsulfonsäurechlorid auf Amidoxime". Chemische Berichte 24: 4162-4167. See also Anales de Química Bulletin des Sociétés Chimiques Belges Bulletin de la Société Chimique de France doi:10.1002/cber.189102402316. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.  …
12. ^ Notes - The Reaction of Phosphorous-Containing Enzyme Inhibitors with Some Hydroxylamine Derivatives Robert Plapinger, Omer Owens J. Org. Chem.; 1956; 21(10); 1186-1187. The Journal of Organic Chemistry (abbreviated as J Org Chem or JOC) is a Scientific journal for original contributions of fundamental doi:10.1021/jo01116a610

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