Preparation of a cyclopropylacetic acid and its derivatives

Details Preparation of a cyclopropylacetic acid and its derivatives Preparation of a cyclopropylacetic acid and its derivatives

C - Chemistry, Metallurgy

07

C

260/518, 260/479

C07C 62/28 (2006.01) C07C 45/40 (2006.01) C07C 45/67 (2006.01) C07C 59/147 (2006.01) C07C 69/757 (2006.01)

Patent

CA 1147343

ABSTRACT Novel 2-formyl-3,3-dimethylcyclopropylacetic acid, its esters, salts or dialkylacetals are prepared by a process which comprises ozonolysis of 3-acetyl-6,6-dimethylbicyclo [3.1.0]-2- hexene, reductive cleavage of the ozonide product thus found, and optionally converting the free acid into an ester, a salt or a dialkyl acetal. The acetic acid derivative is an inter- mediate in the manufacture of pyrethroid insecticides. The bicyclohexene starting material is preferably obtained from the naturally-occurring terpene (+)-3-carene.

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