Synthesis of trinuclear silicon-,germanium-,and tin-containing tungsten carbene complexes [(Bu~tO)_2(Cl)_2W=CH]_2EPh_2 (E = Si,Ge,or Sn). Crystal structure of [(Bu~tO)2(Cl)_2W=CH]_2SiPh_2 complex

摘要

New trinuclear organosilicon,organogermanium,and organotin-containing tungsten carbene complexes Ph_2E[CH=WCl_2(OBu~t)_2]_2 (E = Si,Ge,or Sn) were synthesized by the reaction of the trinuclear carbyne complexes Ph_2E[C ident to W(OBu~t)_3]_2 with HCl.The tin-containing carbene complex is thermally unstable and was identified in solution by ~1H and ~(13)C NMR spectroscopy.The silicon-and germanium-tungsten carbene complexes were isolated in high yields as individual crystals and were characterized by elemental analysis,IR spectroscopy,and ~1H and ~(13)C NMR spectroscopy.The structure of the silicon-containing complex Ph_2Si[CH=WCl_2(OBu~t)_2]_2 was established by X-ray diffraction.