Reaction of poly(pyrazol-1-yl)methane tetracarbonylmolybdenum (tungsten) with RSnCl3 (R = Ph, Cl): X-ray crystal structure of CH2(3,5-Me(2)Pz)(2)W(Cl)(CO)(3)(SnCl3) (Pz : Pyrazolyl)

摘要

Bis(pyrazolyl)methane can be synthesized by the reaction of pyrazole with dibromomethane in phase transfer catalytic conditions. It reacts with M(CO)(6) (M = Mo, W) to give bis(pyrazolyl)methane tetracarbonylmolybdenum(0) and tungsten(0) complexes in good yield. Upon treatment of these complexes with RSnCl3 (R = Ph, Cl), the seven-coordinate Mo(II) and W(II) products were obtained. The molecular structure of CH2(3,5-Me(2)Pz)(2)W(Cl)(CO)(3)(SnCl3) determined by X-ray crystallography showed that the six-membered W-N-N-C-N-N metallacycle was in a boat form. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 20]