Reactions of silicon-, germanium- and tin-containing carbene complexes of tungsten Ph3E–CW(OBut)3 (E=Si, Ge, Sn) with hydrogen chloride: crystal structures of carbene complexes Ph3E–CHWCl2(OBut)2 (E=Si, Ge)

The novel organosilicon, -germanium and -tin-containing carbene complexes of tungsten of the type Ph3E–CHWCl2(OBut)2 (E=Si, Ge, Sn) have been prepared by the reaction of heteroelement-containing carbene complexes of tungsten Ph3E–CW(OBut)3 (E=Si, Ge, Sn) with hydrogen chloride. The tin-containing carbene complex was identified in solution by 1H NMR spectroscopy. Silicon- and germanium-containing carbene complexes were isolated in high yields as crystalline solids and characterized by elemental analysis, IR, 1H NMR, 13C NMR and 29Si NMR spectroscopy and X-ray diffraction studies. The geometry of the W atoms in the compounds can be described as a distorted square pyramid.