Stereospecific isomers of phenoxyalkanoic acid derivatives

Details Stereospecific isomers of phenoxyalkanoic acid derivatives Stereospecific isomers of phenoxyalkanoic acid derivatives

C - Chemistry, Metallurgy

07

C

260/514.4, 260/4

C07C 59/125 (2006.01) A01N 39/02 (2006.01) C07C 59/58 (2006.01) C07C 69/712 (2006.01)

Patent

CA 1159468

A B S T R A C T Stereo-specific isomers of phenoxy-alkanoic acid derivatives, especially phenoxy-propionic acid derivatives, can be prepared by re- acting a substituted phenol, e.g., 4-chloro-2-methyl phenol or 2,4- dichlorophenol with a lactic acid derivative of formula: Image wherein X-O- is a leaving group, e.g., methane sulphonyl; R2 = 1-4 C alkyl; and R1 = H, metal ion, alkyl or (substituted) ammonium and x denotes the absolute configuration of the lactic acid derivative concerned, at elevated temperature with a base. The R-(+)-isomers exhibit selective activity against broad-leaved weeds.

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