H_2C=ZrH_2]:The Simplest Carbene Hydride Complex,Agostic Bonding,and OH Activation of CH_4 to Form [(CH_3)_2ZrH_2

摘要

High oxidation state transition-metal complexes with a carbon-metal double bond have proven important for understanding the nature of metal coordination and for catalysts in alkene-metathesis and alkane-activation reactions.Several early transition-metal alkylidenes are agostic,and these compounds provide the opportunity to characterize the agostic interaction of hydrogen to a transition-metal center in a simple carbene complex (most agostic interactions involve much more complicated systems) and to help understand the important alkane C-H bond-activation process (a key step in many transition-metal catalyzed reactions).