Double-Dimethylsilyl-Bridged Dicyclopentadienyl Group 4 Metal Complexes. X-ray Molecular Structures of M[(Me2Si)2(.eta.5-C5H3)2]Cl2 (M = Ti, Zr) and (TiCl3)2{.mu.-[(Me2Si)2(.eta.5-C5H3)2]}

Transition metal complexes with functionalized silyl-substituted cyclopentadienyl and related ligands: synthesis and reactivity

“…Thermal diastereomerization of the racemic into the meso structure has been observed and a possible mechanism is proposed [19m]. Metallocenes with two bridging groups are the subject of investigation elsewhere as catalysts for olefin polymerization [17,38,39].…”

Synthesis and reactivity of new mixed dicyclopentadienyl Group 4 metal complexes with the doubly bridged bis(dimethylsilanediyl)-cyclopentadiene-(η5-cyclopentadienyl) ligand

“…However di-h 5 -cyclopentadienyl ligands singly bridged by various alkyl [2 -5] and silyl [6][7][8][9][10][11][12][13][14] groups are among the most frequently used systems to bridge dinuclear metal compounds. We have recently reported the use of the 1,1%-2,2%-(dimethylsilanediyl)dicyclopentadienyl ligand to synthesize ansadicyclopentadienyl and bridged homodinuclear monoand di-cyclopentadienyl complexes of the Group 4 and 6 metals [15][16][17][18][19][20]. This and related doubly silyl-bridged ligands have also been used [14,21] to isolate mononuclear and dinuclear Group 4 metal compounds.…”

Enantioselective Hydrogenations with Chiral Titanocenes

“…This problem may also be resolved by incorporation of a double-bridge in the ligand, to form complexes such as 40-42 [47,48,49] or disilyl-bridged 43 titanocenes [50,51]. Because of the rigid structure of these complexes, only one titanocene enantiomer is obtained.…”