MANUFACTURE OF ALPHA-CYANO-3-PHENOXY-BENZYL- 3-ALKENYL-2,2-DIMETHYL-CYCLOPROPANE CARBOXYLATE

    公开(公告)号:JPS5867659A

    公开(公告)日:1983-04-22

    申请号:JP16775282

    申请日:1982-09-28

    申请人: BAYER AG

    摘要: A process for the preparation of a known pesticidal alpha -cyano-3-phenoxy-benzyl 3-alkenyl-2,2-dimethyl-cyclopropanecarboxylate of the general formula (I) in which R1 and R2 independently of each other represent a hydrogen or halogen atom, R3 represents a hydrogen or halogen atom or an optionally substituted alkyl group, and R4 represents a halogen atom, an optionally substituted alkyl or alkenyl radical or an optionally substituted phenyl group, or, together with R3, represents an alkanediyl (alkylene) radical, comprises reacting a 3-alkenyl-2,2-dimethyl-cyclopropanecarboxylic acid-chloride of the general formula (II) with a 3-phenoxy-benzaldehyde of the general formula (III) -or an adduct thereof with an alkali metal bisulphite (hydrogen sulphite or pyrosulphite)-and an alkali metal cyanide, using an alkyl ester of a C1 to C6 carboxylic acid and water as diluents, if appropriate with the addition of an alkali metal bisulphite, at a temperature between -5 and +25 DEG C. The compounds of formula (I) may be so produced with a high proportion of the more pesticidally active isomers present.