A Three-Stage Mechanistic Model for Ammonia–Borane Dehydrogenation by Shvo’s Catalyst
作者:Zhiyao Lu、Brian L. Conley、Travis J. Williams
DOI:10.1021/om300562d
日期:2012.10.8
We propose a mechanisticmodel for three-stage dehydrogenation of ammonia borane (AB) catalyzed by Shvo's cyclopentadienone-ligated ruthenium complex. We provide evidence for a plausible mechanism for catalyst deactivation, the transition from fast catalysis to slow catalysis, and relate those findings to the invention of a second-generation catalyst that does not suffer from the same deactivation
The novel stable Shvo ammonia complex [2,3,4,5-Ph4(η4-C4CO)]Ru(CO)2(NH3) (6) has been isolated in high yield in the catalyticalkylation of aniline with hexylamine. It has been characterized by X-ray analysis and density functional theory computation. The thermodynamic stability of Shvo-like ruthenium complexes with primary, secondary, and tertiary amines has been computed and compared. Calculations