| 摘要 |
<p>Transition metal compounds coordinated with bis-cyclopentadienyl type ligands, in which steric hindrance is given to the central metal and the direction of steric hindrance is controlled, not by connection cyclopentadienyl moities directly with diradical as in previous arts, but by selecting appropriate number of atoms and location of bridge-bonding as shown in formula (X) and (XI) where R1 - R6 are respectively same or different substituent containing 1 - 20 non-hydrogen atoms.</p> |
