Evidence of prevailing strain effects on the valence state of the 5-phenyl-4,6-dioxa-1-aza-5-phospha(V)bicyclo[3.3.0]octan-5-yl radical

Abstract

The valence state of phenylphosphoranyl radicals, which has been shown to depend on the electro-negativity of the other ligands, appears also to be influenced by incorportion of the phosphorus within a rigid skeleton, which forces the unpaired electron of the bicyclic title compound to be centred on phosphorus in contrast to the behaviour of its acyclic analogue, in which the unpaired electron is preferentially located on the aromatic ring.