PRODUCTION OF DIESTERS OF DICARBOXYLIC ACIDS BY ELECTROCHEMICAL CONDENSATION OF 'ONOESTERS OF DICARBOXYLIC ACIDS

摘要

1438335 Dicarboxylic acid diesters BASF AG 3 Oct 1973 [4 Oct 1972] 46201/73 Heading C2C [Also in Division C6] Diesters of dicarboxylic acids (6-18C) and alcohols (4-12C) are prepared by electrochemical condensation of a monoester of a dicarboxylic acid (4-10C) and an alcohol (4-12C). A 20-60% weight solution in methanol, containing 0À2 to 5% by weight of water is used with a basic compound such that the degree of neutralization is from 1 to 30 mole per cent. Monoesters of glutaric, adipic, pimelic, suberic, azelaic and sebacic acids, e.g. monobutyl, isobutyl, 2-butyl, pentyl, hexyl, cyclohexyl, octyl, 2-methylhexyl-(5) 2-ethylhexyl, decyl, or dodecyl esters may be used, in particular the 2-ethylhexanol monoester of adipic acid and the basic compounds may be sodium carbonate, methylate, hydroxide or amines. Conventional cells with for example platinum anodes may be used. Examples describe the electrolysis of mono-2-ethylhexyl adipate and glutarate to the di-2-ethylhexyl sebacate and suberate.