title: 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)3CC[double bond, length as m-dash]C(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.
authors.affiliation: Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, FL 32611, USA. veige@chem.ufl.edu.
authors.forename: S A
authors.initials: SA
authors.lastname: Gonsales
authors.forename: M E
authors.initials: ME
authors.lastname: Pascualini
authors.forename: I
authors.initials: I
authors.lastname: Ghiviriga
authors.forename: A S
authors.initials: AS
authors.lastname: Veige