Ketoenamine pyrethroid intermediates

摘要

Novel pyrethroid intermediates <IMAGE> wherein R1 and R2 each is alkyl are prepared by treating 2,2-dimethyl-3-(2-oxopropyl)cyclopropylacetaldehyde with a trialkylsilyldialkylamine. The above compounds can be treated with ozone to form 2,3-dimethyl-3-(2-oxopropyl)cyclopropanecarbaldehyde.