Abstract
We shall be concerned with pericyclic reactions that are catalyzed along their concerted pathways. In this respect, the ligand rearrangement will exactly mirror its metal-free pericyclic counterpart. Metals can, of course, catalyze pericyclic reactions along stepwise, nonconcerted pathways, but we shall not discuss these here. The focus of this paper will be to cite literature examples which appear to support earlier theoretical proposals1 suggesting that certain transition metal complexes can totally remove orbital symmetry restrictions, allowing their ligands freedom to transform along otherwise forbidden pericyclic modes, and to do so with preservation of coordinate bonding.2
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