of cyclopropanemethanols with pyridinium poly(hydrogenfluoride) in the presence of diisopropylamine and KHF2 gave selectively homoallylic fluorides or fluorocyclobutanes according to the mode of substitution of the starting cyclopropanemethanols. Cyclopropanemethanols with no substitution at 1-position of the cyclopropane ring gave homoallylic fluorides in a stereoselective manner. While, 1-methyl
Treatment of cyclopropylmethanols with pyridinium poly(hydrogen fluoride) in chlorobenzene-diisopropylamine in the presence of KHF2 gave selectively homoallylic fluorides.
Insecticidal, acaricidal, nematicidal or molluscicidal compounds of formula (I)
wherein Y is a single bond, C=O, C=S or S(O)q where q is 0, 1 or 2; and R1, R2, R3, R4, R8, R9 are R10 are as defined in the claims or salts or N-oxides thereof, processes for preparing them and compositions containing them.