Synthesis and structures of silicon-, germanium- and tin-containing tungsten imido alkyl complexes (ArN)2W(CH2EMe3)2 (E = Si, Ge, Sn)

Abstract The novel silicon-, germanium- and tin-containing imido alkyl complexes of tungsten of the type (ArN) 2 W(CH 2 EMe 3 ) 2 ( Ar = 2 , 6 - Pr 2 i C 6 H 3 ; E = Si ( 1 ), Ge ( 2 ), Sn ( 3 )) have been prepared by the reactions of (ArN) 2 WCl 2 (dme) (dme = 1,2-dimethoxyethane) with heteroelement-containing alkyllithium or Grignard reagents Me 3 ECH 2 Li (E = Si, Ge), Me 3 ECH 2 MgCl (E = Ge, Sn). The title compounds were isolated in high yields as crystalline solids and characterized by elemental analysis, IR, 1 H, 13 C, 29 Si and 119 Sn NMR spectroscopy and X-ray diffraction studies. The geometry of the W atoms in the compounds can be described as a distorted tetrahedron.