Process for the preparation of alkenyl cyanoacetates.

摘要

Process for the preparation of a cyanoacetate having the following general formula:
<CHEM>
wherein each of the symbols R<1> and R<2> represents an alkyl group or a cycloalkyl group, by contacting cyanoacetic acid with an alkenyl halide of the general formula:
<CHEM>
wherein R<1> and R<2> have the same meaning as defined hereinbefore and Hal represents a halogen atom having an atomic number of at least 17, in the presence of a hydrogen-halide acceptor and a substantially inert organic solvent. The compounds of formula (I) are intermediates having uses in the manufacture of pyrethroid insecticides and other compounds.