Process for the preparation of cyclopropanecarbonitriles

Details Process for the preparation of cyclopropanecarbonitriles Process for the preparation of cyclopropanecarbonitriles

C - Chemistry, Metallurgy

07

B

260/559.7

C07B 37/06 (2006.01) C07C 253/30 (2006.01) C07C 255/48 (2006.01)

Patent

CA 1085873

ABSTRACT A process for the preparation of a cyclopropanecarbonitrile of the general formula:- Image (I) wherein R1 and R2 each individually represent an alkyl group of 1-6 carbon atoms and Hal represents a fluorine, chlorine or bromine atom, which comprises heating a cyclopropanecarboxylate of the general formula:- Image (II) in tile presence of a polar aprotic solvent, R1, R2 and Hal in general formula II having the same meanings as in general formula I and X represents a quaternary ammonium group. These compounds find use as intermediates in the preparation of insecticidally active compounds derived from the related carboxylic acids, such as esters of 2-(2,2-dichlorovinyl)-3,3-dimethyl- cyclopropanecarboxylic acid.

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