On Baldwin's kinetic barrier against 5-(enol-endo)-exo-trigonal closures: a comparison of ionic and analogous radical reactions, and a new synthesis of cyclopentanones
Abstract
The kinetic barrier that impedes ionic 5-(enol-endo)-exo-trigonal closures does not play such a dominant role in the case of α-oxo radicals (17); these radicals cyclize directly to cyclopentanones in a process that constitutes a synthetic method for converting allylic alcohols (12) into bicyclo[n.3.0]alkanones (19).