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Threemono-cyclopentadienyl metal complexes, [C6H4O2]CpTiCl (Ⅰ), [C12H8O2]CpTiCl (Ⅱ), and [C20H12O2]and 2,2'-bisnaphthol, respectively. In the presence of a moderate amount of methylaluminoxane (MAO), thecomplexes exhibited catalytic activities for eth