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η 5 -Cyclopentadienyl-stabilized metallacyclopentane and -cycloheptane derivatives of chromium have been isolated, and their chemical behavior lends support to a metallacyclic mechanism for the Cr-catalyzed selective trimerization of ethylene to 1-hexene. In the presence of MAO, the amino-substituted cyclopentadienyl−chromium derivatives show a remarkable activity for the catalytic polymerization of ethylene.
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Emrich et al. (1997) studied this question.
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