Evidence for a zwitterionic transition state in double bond rotations within tungsten–vinyl complexes†
Abstract
The trianionic pincer supported tungsten–vinyl complex [CF3-ONO]W(O){(CH3)3CCC(CH3)2} (3syn) undergoes facile double bond rotation at ambient temperature. The degenerate methyl exchange rates were measured via selective inversion-recovery experiments. DFT computations in conjunction with experimentally determined rate constants support a double bond rotation that proceeds via a Zwiterionic transition state.