Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A methyl ester of a carboxylic acid when used as a substituent -CO2-CH3

Etymologies

Sorry, no etymologies found.

Examples

  • In the presence of AlCl_3 the chlorides easily combine with benzene, and on removing the carbomethoxy group unsymmetrical hydroxy derivatives of benzophenone are formed: --

    Synthetic Tannins

  • The chlorides may be coupled with free hydroxybenzoic acids, and on removing the carbomethoxy group didepsides are obtained.

    Synthetic Tannins

  • The substance is dissolved directly in sufficient normal alkali to neutralise the carboxyl group and a further 2 molecules of caustic soda for each carbomethoxy group to be eliminated are added.

    Synthetic Tannins

  • The elimination of the carbomethoxy group may be brought about by dilute alkaline solutions in the cold, or by aqueous ammonia.

    Synthetic Tannins

  • The principles underlying the synthesis of depsides are the following: -- If the chlorides of carbomethoxy (or carbethoxy) hydroxybenzoic acids are coupled with the sodium salts of hydroxybenzoic acids, esters are formed, _e. g.

    Synthetic Tannins

  • The carbomethoxy group is easily removed by excess of aqueous alkali in the cold, and is also partially removed when insufficient alkali is present; the latter fact is of importance in the synthesis of didepsides.

    Synthetic Tannins

  • The carbomethoxy derivatives of the depsides are as a rule crystalline substances of distinct acidic character, and decompose alkaline carbonates.

    Synthetic Tannins

  • When the chloride of its carbomethoxy derivative is allowed to interact with _p_-hydroxybenzoic acid in aqueous alkaline solution, in the cold, the alkali salt of carbomethoxy-_p_-hydroxybenzoic acid is formed: -- [Footnote 1: _Ber.

    Synthetic Tannins

  • Many hydroxybenzoic acids require an excess of chlorocarbonic methyl ester, which then also, to some extent, attacks the carboxyl group; but on dissolving the product in acetone and treating it with bicarbonate the carboxyl group as such is again restored without splitting off the carbomethoxy group. [

    Synthetic Tannins

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