Synthesis of trinuclear silicon-, germanium-, and tin-containing tungsten carbene complexes [(ButO)2(Cl)2W=CH]2EPh2 (E = Si, Ge, or Sn). Crystal structure of [(ButO)2(Cl)2W=CH]2SiPh2 complex

Abstract

New trinuclear organosilicon, organogermanium, and organotin-containing tungsten carbene complexes Ph2E[CH=WCl2(OBut)2]2 (E = Si, Ge, or Sn) were synthesized by the reaction of the trinuclear carbyne complexes Ph2E[C≡W(OBut)3]2 with HCl. The tin-containing carbene complex is thermally unstable and was identified in solution by 1H and 13C 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 13C NMR spectroscopy. The structure of the silicon-containing complex Ph2Si[CH=WCl2(OBut)2]2 was established by X-ray diffraction.