Process for the preparation of an alkyl 2-chloropropionate

Details Process for the preparation of an alkyl 2-chloropropionate Process for the preparation of an alkyl 2-chloropropionate

C - Chemistry, Metallurgy

07

C

260/494.3

C07C 69/63 (2006.01) C07C 67/00 (2006.01) C07C 67/30 (2006.01) C07C 67/307 (2006.01) C07C 67/317 (2006.01) C07C 69/03 (2006.01) C07C 69/22 (2006.01) C07C 69/24 (2006.01) C07C 69/68 (2006.01) C07C 67/287 (2006.01)

Patent

CA 1156257

ABSTRACT "PROCESS FOR THE PREPARATION OF AN ALKYL 2-CHLOROPROPIONATE" A racemic or optically active alkyl 2-chloro- propionate (useful in the manufacture of racemic or optically active 2-phenoxypropionic acids which have, herbicidal and phytohormonal properties) is prepared from a racemic or optically active alkyl lactate by a process comprising, in a first stage, gradually bringing the alkyl lactate into contact with thionyl chloride, in the presence of an organic base, whilst maintaining in the reaction mixture an excess of thionyl chloride, relative to the amount of alkyl lactate introduced into the mixture, at a temperature below the decomposition point of the chlorosulphinate of the alkyl lactate, which is formed as an intermediate, and, in a second stage, heating the reaction mixture at a temperature which is at least equal to the decomposition point of the chlorosulphinate of the alkyl lactate.

354317

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