The electron spin resonance spectra of cyclopropylacyl radicals: spectroscopically distinguishable σ-radicals related by rotation about a single bond
Abstract
Below –90°C, cyclopropylacyl radicals show two e.s.r. spectra which are associated with the two conformers, of approximately equal stability, in which the plane containing the acyl group bisects the cyclopropyl ring, with a two-fold rotational barrier of about 17·5 kJ mol–1.