Reaction of Carbon Dioxide and Heterocumulenes with an Unsymmetrical Metal-Metal Bond. Direct Addition of Carbon Dioxide across a Zirconium—Iridium Bond and Stoichiometric Reduction of Carbon Dioxide to Formate

摘要

The use of carbon dioxide in large-scale metal-mediated catalytic processes has been quite limited so far. Because of this, there is substantial interest in exploring and understanding the reactions of carbon dioxide and its analogues with transition metal complexes. It seemed likely to us that the unsymmetrical metal—metal interaction in early—late heterobinuclear (ELHB) complexes might be ideal for inducing reactions with potentially polarizable organic molecules such as CO_2. Although a plethora of ELHB complexes have been synthesized, few show cooperative reactivity, and far fewer ELHB complexes of CO_2 or heterocumulenes have been made or structurally characterized.