Organic Chemistey for JEE|NEET|GATE|NET
Stevens rearrangement is a base-promoted [1,2]-migration rearrangement of quaternary ammonium salts or sulfonium salts to the corresponding tertiary amines or sulfides. Stevens rearrangement involves the [1,2]-migration of one of the groups on the nitrogen or sulfur atom.
The rearrangements reactions are important Name reaction in organic chemistry. Wittig rearrangement, first reported by G. Wittig and L. Löhmann in 1942, The Wittig rearrangement converts α-metalated ethers to metal alkoxides, yielding secondary or tertiary alcohols. Its nitrogen analog, the aza-Wittig rearrangement, transforms α-metalated tertiary amines into rearranged metal amides, producing homoallylic secondary amines. This … Read more
Sommelet-Hauser rearrangement is one of the thermal [2,3]-sigmatropic rearrangements, in which the benzylic quaternary ammonium salts are treated within the presence of a strong base like NaNH2, KNH2, as well as alkyl lithium to prepare the Substituted 3° benzylic amine.
The Carroll Rearrangement is a named reaction in organic chemistry, where the [3,3]-sigmatropic rearrangement of allylic β-keto esters to form γ,δ-unsaturated ketones is called the Carroll rearrangement. It is also known as the Kimel–Cope or decarboxylative Claisen rearrangement. Here, we will explore the Carroll rearrangement and its mechanism, accompanied by some interesting examples. Carroll Rearrangement … Read more
Benzilic Acid Rearrangement converts 1,2- diketone into α hydroxycarboxylic acid in presence of NaOH. For this transformation, 1,2- diketone is first treated with alkali hydroxide to get salt of alpha hydroxy carboxylic acid, which, after an acidic workup, gives α-hydroxy carboxylic acid. The reaction takes place with both aliphatic and aromatic α-diketones and α-keto aldehydes. Usually diaryl … Read more
Schmidt reaction is a acid-catalyzed Rearrangement reaction of hydrazoic acid reactions of electrophiles, like carbonyl compounds, alkenes tertiary and alcohols. The following these substrates include amines, nitriles, amides or imines, rearrangement and extrusion of nitrogen.