ALKENYL AND ETHYL COMPLEXES OF TITANOCENE - MOLECULAR-STRUCTURE OF (CP2TI(CME=CHME))2MU-O

The acetylene complexes Cp2Ti(PMe3)(C2H2) (1) and Cp2Ti(C2Me2) (2) and the ethylene complex Cp2Ti(C2H4) (3) react with alcohols ROH (R = Me, Et, Ph) to give the η1-alkenyl complexes Cp2Ti(CR′=CHR′)(OR) (R′ = H, Me) and the ethyl complexes Cp2Ti(Et)(OR). The reaction of 1-3 with water results in the formation of the oxo-bridged dimeric complexes [Cp2Ti(CR′=CHR′)]2μ-O and [Cp2Ti(Et)]2μ-O. The acids HX (X = Cl, CF3COO) react with 1 and 2 to give the monomeric η1-alkenyl compounds Cp2Ti(CR′=CHR′)(X). The trifluoroacetate derivatives are very unstable and react with water to yield the stable oxo-bridged complex [Cp2Ti(OOCCF3)]2μ-O. The crystal structure of [Cp2Ti(CMe=CHMe)]2μ-O is described. © 1990.