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Dr. Zhe Liu, Prof.Dr. Robert J. Deeth, Jennifer S. Butler, Dr. Abraha Habtemariam, Prof. Dr. Mark E. Newton and Prof. Dr. Peter J. Sadler Reduction of Quinones by NADH Catalyzed by Organoiridium Complexes Angewandte Chemie International Edition 52

Version of Record online: 7 MAR 2013 | DOI: 10.1002/anie.201300747

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One electron at a time: Half-sandwich organometallic cyclopentadienyl–IrIII complexes containing N,N-chelated ligands can catalyze the reduction of quinones (Q), such as vitamin K3, to semiquinones (Q.−) by coenzyme NADH (see picture). DFT calculations suggest that the mechanism involves hydride transfer followed by two one-electron transfers and the unusual IrII oxidation state as a key transient intermediate.

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