Abstract
An anionic binuclear complex of tungsten(II), [(μ-Cl) 3{W(SnCl 3)(CO) 3} 2] − ( 1 −), containing the protonated piperidine molecule [Hpip] + as the counter ion, has been obtained during crystallization of the product from reaction between [W(CO) 4(pip) 2] and SnCl 4 in dichloromethane solution, and its molecular structure has been elucidated by single-crystal X-ray diffraction studies. The chemical properties of complex 1 were investigated by IR and NMR spectroscopy in solution and its catalytic activity was checked in reaction with norbornene (NBE). In the presence of complex 1, NBE transformed to a new olefin, 2,2′-binorbornylidene with ca. 50% yield in dichloromethane solution. The spectroscopic characteristics of complex 1 − were compared with those of the reinvestigated analogue compound [(μ-Cl) 3W 2(SnCl 3)(CO) 7] ( 2). The 119Sn and 13C NMR data indicated that in dichloromethane solution complex 2 transformed to the ionic complex 1 −.
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