| abstract |
PURPOSE: To obtain a novel thiobutyric acid deriv. that is effective as a preventing agent against harmful pests, especially to remove insects or spiders in farms, forests and cattle. n CONSTITUTION: This compd. is expressed by formula I, wherein each of R 1 and R 2 is H or a 1 to 4C alkyl, 1 to 4C halogenated alkyl, and R 3 is H or an org. group. For example, the compd. is ethyl-4-chloro-4,4'-difluorobutyrate. The compd. is obtd. by the reaction of 4-chloro-4,4'-difluorobutyryl halide expressed by formula II (wherein Hal is a halogen) with mercaptan expressed by H-S-R 3 preferably in the presence of a base (such as pyridine) in an inert solvent such as benzene at a temp. of -30 to 120°C. Or, the compd. cam be obtd. by the reaction of 4-chloro-4,4'-difluorobutyric acid and mercaptan expressed by H-S-R 3 in the presence of a dewatering agent. n COPYRIGHT: (C)1992,JPO |