enow.com Web Search

Search results

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

    en.wikipedia.org/wiki/Zincke_reaction

    The first reaction is the formation of the N-2,4-dinitrophenyl-pyridinium salt (2). This salt is typically isolated and purified by recrystallization. The formation of the DNP-pyridinium salt. Upon heating a primary amine with the N-2,4-dinitrophenyl-pyridinium salt (2), the addition

  3. Eschweiler–Clarke reaction - Wikipedia

    en.wikipedia.org/wiki/Eschweiler–Clarke_reaction

    The Eschweiler–Clarke reaction (also called the Eschweiler–Clarke methylation) is a chemical reaction whereby a primary (or secondary) amine is methylated using excess formic acid and formaldehyde. [1] [2] Reductive amination reactions such as this one will not produce quaternary ammonium salts, but instead will stop at the tertiary amine ...

  4. 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atom with a lone pair.Formally, amines are derivatives of ammonia (NH 3), wherein one or more hydrogen atoms have been replaced by a substituent such as an alkyl or aryl group [4] (these may respectively be called alkylamines ...

  5. Quaternary ammonium cation - Wikipedia

    en.wikipedia.org/wiki/Quaternary_ammonium_cation

    Quaternary ammonium compounds are prepared by the alkylation of tertiary amine. Industrial production of commodity quat salts usually involves hydrogenation of fatty nitriles, which can generate primary or secondary amines. These amines are then treated with methyl chloride. [4] The quaternization of alkyl amines by alkyl halides is widely ...

  6. Stevens rearrangement - Wikipedia

    en.wikipedia.org/wiki/Stevens_rearrangement

    The substituent R next the amine methylene bridge is an electron-withdrawing group. The original 1928 publication by Thomas S. Stevens [2] concerned the reaction of 1-phenyl-2-(N,N-dimethylamino)ethanone with benzyl bromide to the ammonium salt followed by the rearrangement reaction with sodium hydroxide in water to the rearranged amine.

  7. Menshutkin reaction - Wikipedia

    en.wikipedia.org/wiki/Menshutkin_reaction

    In organic chemistry, the Menshutkin reaction converts a tertiary amine into a quaternary ammonium salt by reaction with an alkyl halide. Similar reactions occur when tertiary phosphines are treated with alkyl halides. Menshutkin-reaction. The reaction is the method of choice for the preparation of quaternary ammonium salts. [1]

  8. Mannich reaction - Wikipedia

    en.wikipedia.org/wiki/Mannich_reaction

    The mechanism of the Mannich reaction starts with the formation of an iminium ion from the amine and formaldehyde. [4]: 140 The compound with the carbonyl functional group (in this case a ketone) will tautomerize to the enol form, after which it attacks the iminium ion.

  9. Mannich base - Wikipedia

    en.wikipedia.org/wiki/Mannich_base

    A Mannich base is a beta-amino-ketone, which is formed in the reaction of an amine, formaldehyde (or an aldehyde) and a carbon acid. [1] The Mannich base is an endproduct in the Mannich reaction, which is nucleophilic addition reaction of a non-enolizable aldehyde and any primary or secondary amine to produce resonance stabilized imine (iminium ion or imine salt).