Chemistry Letters, Vol.29, No.4, 434-435, 2000
Activation of a trans-dialkyl(oxo)tungsten complex bearing a 2,6-pyridinediethanolate ligand with aluminum cocatalysts to catalyze the ROMP of norbornene
A novel trans-bis(trimethylsilylmethyl)(oxo)tungsten complex bearing an O-N-O tridentate ligand, WO(Me(4)pyde)-(CH2SiMe3)(2) (4, pyde = 2,6-pyridinediethanolate), was synthesized and was confirmed to have octahedral structure with two alkyl groups in trans position by X-ray analysis. Complex 4 catalyzed the polymerization of norbornene although its activity was rather low. The activity of 4 could be dramatically enhanced by the use of AlEt3 or AlCl3 as a cocatalyst.