Improvements relating to pesticides.

摘要

A compund of formula II
RACH2COCHDRB
in which formula:
RA represents a group ArCR1R2- in which Ar represents a phenyl or naphthyl group optionally substituted by one or more halogen, alkoxy, haloalkoxy, methylenedioxy or C1-C6 alkyl or haloalkyl groups;
R1 and R2 together with the carbon to which they are attached jointly represent a C3-C6 cycloalkyl group optionally substituted by one or more halogen atoms or C1-C6 cycloalkyl groups and
RB represents the residue of an alcohol RBCHDOH in which D is hydrogen or cyano and of which the [IR, cis]2,2-dimethyl-3-(2,2-dibromovinyl)cyclopropane carboxylic ester is significantly insecticidal.