Preparation of an alkenyl cyanoacetate

Details Preparation of an alkenyl cyanoacetate Preparation of an alkenyl cyanoacetate

C - Chemistry, Metallurgy

07

C

260/487.4

C07C 69/74 (2006.01) A01N 37/34 (2006.01) C07C 61/04 (2006.01) C07C 69/025 (2006.01)

Patent

CA 1128958

K314 ABSTRACT The invention relates to a process for the preparation of an alkenyl cyanoacetate which is an intermediate having uses in the manufacture of pyrethroid insecticides and other compounds. Process for the preparation of a cyanoacetate having the following general formula: Image (I) wherein each of the symbols R1 and R2 represents an alkyl group or a cycloalkyl group, characterized in that cyanoacetic acid is contacted with an alkenyl halide of the general formula: Image (II) wherein R1 and R2 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.

309927

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