Group 4 metallocene complexes incorporating vinyl or allyl substituted ansa ligands. X-Ray crystal structures of [Zr{Me(CH2CH)Si(η5-C5Me4)2}Cl2], [Zr{Me(CH2CHCH2)Si(η5-C5H4)2}Cl2] and [Zr{Me(CH2CHCH2)Si(η5-C5Me4)(η5-C5H4)}Cl2]

The vinyl and allyl substituted ansa-ligand precursors, Me(R)Si(C5H5)2 (RCHCH2 (1), CH2CHCH2 (2)) Me(R)Si(C5HMe4)(C5H5) (RCHCH2 (5), CH2CHCH2 (6)), and Me(R)Si(C5HMe4)2 (RCHCH2 (7), CH2CHCH2 (8)), and their lithium derivatives, Li2{Me(R)Si(C5H4)2} (RCHCH2 (9), CH2CHCH2 (10)), Li2{Me(R)Si(C5Me4)(C5H4)} (RCHCH2 (11), CH2CHCH2 (12)), and Li2{Me(R)Si(C5Me4)2} (RCHCH2 (13), CH2CHCH2 (14)), have been prepared. The Group 4 metal complexes, [M{Me(R)Si(η5-C5H4)2}Cl2] (RCHCH2, MTi (15), Zr (16), Hf (17); RCH2CHCH2, MTi (18), Zr (19), Hf (20)), [M{Me(R)Si(η5-C5Me4)(η5-C5H4)}Cl2] (RCHCH2, MTi (21), Zr (22), Hf (23); RCH2CHCH2, MTi (24), Zr (25), Hf (26)), [M{Me(R)Si(η5-C5Me4)2}Cl2] (RCHCH2, MTi (27), Zr (28), Hf (29); RCH2CHCH2, MTi (30), Zr (31), Hf (32)), were synthesized from the reaction of the lithium ansa-derivative and the tetrachloride salts of the transition metal. The reactivity of some of the Group 4 metal complexes has been tested in hydrogenation and hydroboration processes. The molecular structures of 19, 25 and 28 have been determined by single crystal X-ray diffraction studies.