Formation of the (Z,E)‐1,3‐Diphenylallyl Radical from the (Z,E)‐1,3‐Diphenylallyl Anion by Electron Transfer—Comparison of the Rotational Barriers of the Radical and the Anion

The (Z,E)-1,3-diphenylallyl radical has a very low rotational barrier, as demonstrated by the ratios of the yields of dimers. In contrast, the topologically identical anion is configurationally stable.