A Highly Active PBP-Iridium Catalyst for the Dehydrogenation of Dimethylamine-Borane: Catalytic Performance and Mechanism

作者：Kwan Enrique Huang; Ogawa Hayato; Yamashita Makoto

来源：ChemCatChem, 2017, 9(13): 2457-2462.

DOI：10.1002/cctc.201700384

• boron
• dehydrocoupling
• hydrogen
• iridium
• pincer ligands

A long-tethered boron-containing (P-B-P) pincer ligand with an aliphatic backbone was synthesized. Oxidative addition of the B-H bond in the ligand to [Ir(coe)(2)Cl](2) (coe=cyclooctene) afforded the (P-B-P) Ir(H) Cl complex. A catalyst system comprising the iridium complex and KOtBu showed excellent performance in the dehydrocoupling of N,N-dimethylamine-borane (DMAB), releasing 1 equivalent of dihydrogen gas from a concentrated solution of DMAB at a low catalyst loading of 0.05 mol% and with an initial turnover frequency of approximately 3400 h @ 1. The dihydride (P-B-P) Ir(H)(2) complex also catalyzed the dehydrogenation of DMAB and was postulated as one of the intermediates in the catalytic cycle.

• 出版日期2017-7-7