Organometallic dioxo-, and oxo-thio- and dithio-tungsten(VI) complexes of hydrotris(3,5-dimethylpyrazolyl)borate

Abstract

Reactions of cis-[{HB(Me₂pz)₃}WO₂Cl] with Grignard reagents RMgX (R = Me, Et, CH₂Ph, Ph; X = Cl or Br) in tetrahydrofuran, or boron sulfide in refluxing 1,2-dichloroethane, result in the formation of organometallic dioxo-W^VI complexes, cis-[{HB(Me₂pz)₃}WO₂R], and oxo-thio- and dithio-W^VI complexes, cis-[{HB(Me₂pz)₃}WE₂Cl](E₂= OS, S₂), respectively; the X-ray crystal structure of cis-[{HB(Me₂pz)₃}WO₂Et], a rare example of a complex stable towards β-hydrogen elimination, is reported.