A Rhodium-Mediated Contraction of Benzene to Cyclopentadiene: Transformations of Rhodium(III) m-Benziporphyrin

摘要

The contraction of benzene is one of an exclusive group of reactions where the cleavage of aromatic structure is of fundamental importance. Rhodium(III) m-benziporphyrin undergoes an unprecedented transformation of the built-in m-phenylene in which a perimeter carbon atom is extruded to form rhodium(III) 21-carbaporphyrin, stabilizing the formyl-unit-substituted rhodacyclopropane motif.