enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Imine - Wikipedia

    en.wikipedia.org/wiki/Imine

    Imines are intermediates in the alkylation of amines with formic acid in the Eschweiler-Clarke reaction. A rearrangement in carbohydrate chemistry involving an imine is the Amadori rearrangement . A methylene transfer reaction of an imine by an unstabilised sulphonium ylide can give an aziridine system.

  3. Amine - Wikipedia

    en.wikipedia.org/wiki/Amine

    Amine. In chemistry, amines (/ ə ˈ m iː n, ˈ æ m iː n /, [1] [2] UK also / ˈ eɪ m iː n / [3]) are compounds and functional groups that contain a basic nitrogen atom with a lone pair.Formally, amines are derivatives of ammonia (NH 3), wherein one or more hydrogen atoms have been replaced by a substituent such as an alkyl or aryl group [4] (these may respectively be called alkylamines ...

  4. Eschweiler–Clarke reaction - Wikipedia

    en.wikipedia.org/wiki/Eschweiler–Clarke_reaction

    The reaction is generally performed in an aqueous solution at close to boiling. The first methylation of the amine begins with imine formation with formaldehyde. The formic acid acts as a source of hydride and reduces the imine to a secondary amine. Loss of carbon dioxide gas renders the reaction irreversible. Despite being more hindered, the ...

  5. Reductive amination - Wikipedia

    en.wikipedia.org/wiki/Reductive_amination

    Reductive amination (also known as reductive alkylation) is a form of amination that converts a carbonyl group to an amine via an intermediate imine. The carbonyl group is most commonly a ketone or an aldehyde. It is a common method to make amines and is widely used in green chemistry since it can be done catalytically in one-pot under

  6. Enamine - Wikipedia

    en.wikipedia.org/wiki/Enamine

    Primary amines are usually not used for enamine synthesis due to the preferential formation of the more thermodynamically stable imine species. [11] Methyl ketone self-condensation is a side-reaction which can be avoided through the addition of TiCl 4 [ 12 ] into the reaction mixture (to act as a water scavenger ).

  7. Schiff base - Wikipedia

    en.wikipedia.org/wiki/Schiff_base

    General structure of an imine. Schiff bases are imines in which R 3 is an alkyl or aryl group (not a hydrogen). R 1 and R 2 may be hydrogens General structure of an azomethine compound. In organic chemistry, a Schiff base (named after Hugo Schiff) is a compound with the general structure R 1 R 2 C=NR 3 (R 3 = alkyl or aryl, but not hydrogen).

  8. Ethanimine - Wikipedia

    en.wikipedia.org/wiki/Ethanimine

    Ethanimine is an organonitrogen compound classified as an imine. It is formed by reacting acetaldehyde and ammonia, but rapidly polymerizes to acetaldehyde ammonia trimer. It has two tautomers: ethanimine, an imine, and ethenamine or aminoethylene, an amine. Ethanimine has two hydrogens on the carbon, while ethenamine has two on the nitrogen atom.

  9. Mannich reaction - Wikipedia

    en.wikipedia.org/wiki/Mannich_reaction

    Reactions between aldimines and α-methylene carbonyls are also considered Mannich reactions because these imines form between amines and aldehydes. The reaction is named after Carl Mannich. [2] [3] Scheme 1 – Ammonia or an amine reacts with formaldehyde and an alpha acidic proton of a carbonyl compound to a beta amino carbonyl compound.