HUT37740A - Process for production of phenoxi-alcane acids, their salts and esthers - Google Patents

Abstract

Phenoxy-alkene acids have general compsn. indicated in Fig.(I), X is alkyl gp. or halogen atom which may be replaced by an alkyl halogen gp. having not more than 4 C, n is 0-3, R is H or an alkyl gp. having not more than 3 C. Z is H or alkali metal atom, or an alkyl, alkenyl, alkyl-amine, alkanol, or amine gp., having not more than 10C. In one variant of the method, a phenol cpd. of general compsn. indicated in Fig.(II) where X is as previously stated and m is 0-3, is dissolved in organic solvent immiscible with water and converted into alkali metal salt. In some cases it is reacted with chloralkene acid in presence of phosphorous acid, phosphoric acid or an alkali metal phosphate, and an alkali metal hydroxide, while an azeotropic distillation is carried out. The chlor-alkene acid used has general compsn. indicated in Fig. (III) where R is as before. - In another variant, the phenol cpd. of the general compsn. noted in Fig. (II) where X indicates the chemicals noted in above and m is 0-2, is chlorinated by known method, dissolved in organic solvent immiscible with water and transformed into alkali metal salt. The resulting alkene acid, of general compsn. indicated in Fig. (IV), where R is as before, is chlorinated by known method in presence of phosphor halogenid catalyst with chlor-alkene-acid being obtd. of general compsn. indicated in Fig. (III), reacted in presence of alkali metal hydroxide while carrying out azeotropic distillation