Preparation of 2-cyanohexanoic acid derivatives and the...

Details Preparation of 2-cyanohexanoic acid derivatives and the... Preparation of 2-cyanohexanoic acid derivatives and the...

B - Operations, Transporting

01

J

260/525.8

B01J 31/20 (2006.01)

Patent

CA 1115730

ABSTRACT PREPARATION OF 2-CYANOHEXANOIC ACID DERIVATIVES AND THE DERIVATIVES PREPARED BY THE PROCESS A process for the preparation of 2-cyanohexanoic acid derivative having the general formula: Image (I) wherein X and Y each represent a chlorine or bromine atom, each Hal represents a fluorine, chlorine or bromane atom and R1 and R2 each independently represent an alkyl group of one to four carbon atoms, which comprises reacting a pentenoic acid compound of the general formula: (II) Image wherein R1 and R2 have the same meaning as in the general formula I, with a tetrahalomethane of the general formula: CHal2XY (III) wherein Hal, X and Y have the same meaning as in the general formula I, in the presence of a catalyst and a solvent for the reactants, characterized in that the catalyst is a transition metal in a divided state belonging to Groups VIB, VIIB or VIII of the Periodic Table of the Elements or a carbonyl of such a transition metal. The 2-cyanohexanoic acid derivatives are useful as intermediates in the manufacture of synthetic pyrethroids which are a group of very active insecticides.

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