Photochemical synthesis and reactivity of new chloro-bridged complexes with tungstenocene (eta(5)-C5H5)(eta(5)-C5H4PPh2)WCIX (X = H, Cl) and tetracarbonylmetal (Cr, W) units

Chloro-bridged bimetallic complexes (eta(5)-C5H5)[eta(5)-C5H4PPh2M'(CO)(4)] W(mu-Cl)X [X = Cl (3), X = H (4); M' = Cr, W] were prepared by photochemica l irradiation of (eta(5)-C5H5)[eta(5)-C5H4PPh2M' (CO)(5)]WCIX [X = Cl (1), X = H (2); M' = Cr, W]. The reactivity of the chloro-bridged complexes towa rds Lewis bases was studied; by exposure to CO or phosphanes, a facile clea vage of the chloro bridge accompanied by regio- and stereospecific coordina tion at M' occurs. The X-ray structure of complex 3 (M' = W) is reported.