Patent ID: 6570028
Filing Date: 2003-05-27
Classification: C07D

Abstract:
Process for the manufacture of diglycidylesters of &agr;,&agr;,&agr;â€²,&agr;â€²-branched dicarboxylic acids, comprising:(a) the reaction of an &agr;,&agr;,&agr;â€²,&agr;â€²-branched dicarboxylic acid with a halo substituted monoepoxide, in a 1.1-20 acid equivalent ratio relative to the &agr;,&agr;,&agr;â€²,&agr;â€²-branched aliphatic dicarboxylic acid, in the presence of a catalyst in an amount of at most 45 mol % of the acid equivalent amount of the &agr;,&agr;,&agr;â€²,&agr;â€²-branched aliphatic dicarboxylic acid, and at a temperature in the range of from 30 to 110Â° C., during a period in the range of from 0.5 to 2.5 hr, (b) addition of alkali metal hydroxide or alkali metal alkanolate up to an acid equivalent ratio as to the &agr;,&agr;,&agr;â€²,&agr;â€²-branched aliphatic dicarboxylic acid in the range of from 0.9:1 to 1.2:1, and reaction at a temperature of from 0 to 80Â° C., (c) distillation of the obtained reaction mixture to remove the excess halo substituted monoepoxide and the solvent and water formed, and (d) removal of alkali metal halide salt, in order to complete the dehydrohalogenation.