Intermediates and process for insecticidal biphenylmethyl esters

Compounds of formulae II, III and IV: ##STR1## are useful intermediates for preparation of an insecticidal compound of formula (I) ##STR2## in which R.sub.a and R.sub.b are independently hydrogen, halogen, or alkyl. The intermediate II is prepared by reacting 3,3-dimethyl-4-pentenoic acid, a salt thereof, a lower alkyl ester or an acid chloride thereof with a compound of the formula ##STR3## in which X is hydroxy or a good leaving group. Intermediate III is prepared by reacting II with 1,1,1-trichloro-2,2,2-trifluoroethane in the presence of a solvent and catalyst. Intermediate III is then dehydrohalogenated in the presence of base to remove 2 moles of halogen halide per mole of III in one or two steps to produce I.

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Description
Patent History
Patent number: T102909
Type: Grant
Filed: Sep 7, 1982
Date of Patent: Apr 5, 1983
Inventors: Philip A. Cruickshank (Princeton, NJ), Anthony J. Martinez (Hamilton Square, NJ)
Application Number: 6/415,004
Classifications
Current U.S. Class: Aromatic Alcohol Moiety (560/221); Fluorine In Acid Moiety (560/227); Cyclopropyl In Acid Moiety (560/124)
International Classification: C07C 69533;