TUNGSTEN PRECURSORS IN OLEFIN METATHESIS CATALYSIS - SPECTROSCOPIC STUDY OF CPW(CO)(3)X DERIVATIVES AND CATALYTIC ACTIVITY OF TUNGSTEN BASED MULTICOMPONENT SYSTEMS

A spectroscopic (XPS, UV-VIS, FTIR) investigation of CpW(CO)(3)X precu rsors (X = Cl, Br, I, Me and CpW(CO)(3)) has been performed. The spect roscopic parameters W 4f(7/2) BE, lambda(max) (pi - sigma) and (sigma - sigma) and nu(CO) are mainly governed by the electron density at t he coordination sphere of tungsten. The catalytic activity, initial ra te and %-conversion of tungsten based homogeneous multicomponent syste ms, with respect to the metathesis of 2-pentene, has been studied.