Synthesis of bis(3,4-dimethylcyclopentadienyl)acetylene and bridged metallocenes (.eta.5-C5Me5)M[(.eta.5-C5H2Me2)C.tplbond.C(.eta.5-C5H2Me2)]M(.eta.5-C5Me5) (M = Fe, Ni) derived therefrom

Abstract
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