Consequently, we have been unable to find reaction conditions which permit the desired cyclization reaction (ie., 1+ 4) to predominate over bond cleavage to form acyclic products (eg, 1-t 5). Since available half-wave potential measurements6 suggest that formation of the ketyl 2 should be energetically favored over direct carbon-chlorine bond cleavage (ie., la or lb 3 6), our results imply that the acyclic products 5 isolated have been derived, at least in ...
