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cisand trans-2-Methylcyclopropyl-stannyloxymethyl and -hydroxymethyl radicals (A) have been generated by treating either the corresponding tin alkoxides or alcohols with t-butoxyl radicals, or the corresponding ketones with tributylstannyl radicals. The e.s.r. spectra show that, a t low temperature (< -60°C). the cis-(A) radicals undergo ring-opening to give principally secondary alkyl radicals, but the trans-(A) radicals give only primary alkyl radicals.the enolates have cisor trans-configuration.

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