Direct Observation of Orthogonal Orientation of an Aromatic Ring Attached to the Carbene Carbon in Fischer Carbene Complexes in Solution:  Diastereotopicity of Benzyl Protons as a Stereochemical Probe

Abstract

Diastereotopicity of methylene protons of benzyloxy and benzylamino groups in Fischer carbene complexes serves as a stereochemical probe to reveal orthogonal orientation of the aromatic rings attached to the carbene carbon with respect to the metal−carbene π-plane in solution .