PROCESS FOR THE PREPARATION OF SUBSTITUTED ALPHA-HALOPROPIONIC ACIDS AND OF THEIR DERIVATIVES; SUBSTITUTED VINYLIDENE CHLORIDE

摘要

Substituted alpha -halogenopropionic acids and their derivatives of the general formula (I) wherein R1 to R3, Y and X have the meanings given in the description, are prepared by a process which is characterized in that substituted vinylidene chlorides of the general formula (II) are reacted with chlorine or bromine chloride in the presence of compounds of the formula R5-SO3R6 (III) wherein R5 and R6 have the meaning given in the description, and the products obtained are treated, if appropriate, with water or alcohol. Certain of the substituted alpha -halogeno-propionic acids and the substituted vinylidene chloride of the formula are new. The end products are useful as herbicides and intermediates for insecticides.