C-2-BRIDGED TITANOCENE-FERROCENYL COMPLEXES - SYNTHESIS, REACTION CHEMISTRY, AND ELECTROCHEMICAL-BEHAVIOR

LiC=CFc (2; Fc = (eta(5)-C5H4)(eta(5)-C5H5)Fe) reacts with [Ti]Cl-2 (1 a) ([Ti] = (eta(5)-C5H4SiMe3)(2)-Ti) in a 2:1 molar ratio to produce t he C-2-bridged titanocene-ferrocenyl complex [Ti](C=CFc)(2) (3). While treatment of heterotrinuclear 3 with Ni(CO)(4) (4) affords the hetero tetranuclear tweezer complex {[Ti](C=CFc)(2)}Ni(CO) (5), reaction of 3 with NiCl2 (6) yields Fc-C=CC=C-Fc (7) along with [Ti]Cl-2 (1a) and N i-0 in a redox reaction. 7 can also be synthesized in the chemical oxi dation of 3 with 2 equiv of AgPF6. The electrochemical behavior of com pounds 3 and 5 is discussed. The X-ray structure analysis of complex 3 is reported.