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In organic chemistry, an azo coupling is an reaction between a diazonium compound (R−N≡N +) and another aromatic compound that produces an azo compound (R−N=N−R’).In this electrophilic aromatic substitution reaction, the aryldiazonium cation is the electrophile, and the activated carbon (usually from an arene, which is called coupling agent), serves as a nucleophile.
The Achmatowicz reaction, also known as the Achmatowicz rearrangement, is an organic synthesis in which a furan is converted to a dihydropyran.In the original publication by the Polish chemist Osman Achmatowicz Jr. (b. 20 December 1931 in Vilnius) in 1971 [1] furfuryl alcohol is reacted with bromine in methanol to 2,5-dimethoxy-2,5-dihydrofuran which rearranges to the dihydropyran with dilute ...
The latter easily converts to zidovudine 4 (also known as azidothymidine or AZT), an important antiviral drug, used among others in the treatment of AIDS. [ 17 ] [ 18 ] [ 19 ] Another example of pharmaceutical application of DEAD-assisted Mitsunobu reaction is the synthesis of bis[(pivaloyloxy)methyl [PIVz] derivative of 2'-deoxy-5 ...
Azobenzene is a photoswitchable chemical compound composed of two phenyl rings linked by a N=N double bond.It is the simplest example of an aryl azo compound.The term 'azobenzene' or simply 'azo' is often used to refer to a wide class of similar compounds.
The compound is obtained by azo coupling of aniline and acetoacetanilide or their derivatives. The class of compounds was discovered in Germany in 1909. The initially formed diazo compound tautomerizes to give a ketohydrazone, which features extended pi-conjugation.
However, recent research has indicated that the thermal decomposition is a concerted process, [12] with both steps happening together, due to the absence of any nitrene insertion or addition byproducts observed or isolated in the reaction. [13] Thermodynamic calculations also support a concerted mechanism. [14] Mechanism of the Curtius ...
Two such ligands are attached to the Cr(III) center, giving an overall anion. Metal-complex dyes are a family of dyes that contain metals coordinated to the organic portion. Many azo dyes , especially those derived from naphthols , form metal complexes by complexation of one of the azo nitrogen centers.
In organic chemistry, the Schmidt reaction is an organic reaction in which an azide reacts with a carbonyl derivative, usually an aldehyde, ketone, or carboxylic acid, under acidic conditions to give an amine or amide, with expulsion of nitrogen.