In order to further our study of the bis (2-methylbenz [e] indenyl) zirconium dichloride catalyst system, we have synthesized the analogous tetrahydro-2-methylbenz [e] indene ligand (4). In the process of synthesizing 4, we have found that the structural isomer tetrahydro-2- methylbenz [f] indene (5) is also formed. This has been confirmed by the synthesis of a series of dimethyl (6 and 7), methyl-phenyl (8), and titanium trichloride derivatives (11 and ...