Double addition of H_2 to transition metal-borane complexes: a 'hydride shuttle' process between boron and transition metal centres

摘要

The addition of H_2 across a transition metal-borane bond is reported for the first time providing a mechanism for recharging borane functional groups to borohydride. The synthesis of the first authenticated transition metal-borane complexes, the so-called 'metallaboratranes',1 in 1999 enriched the fields of organometallic, coordination and transition metal-boron chemistry.2 Since this time, a wide range of diverse transition metal-borane complexes have been prepared. Such complexes are of particular interest due to the sigma acceptor (Z-class) interaction between the boron and metal centre.