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New metallocene Ziegler catalysts are generated by activation of the rigid ansa-metallocenes 2 with methylalumoxane. Complexes 2 are formed by application of an acid-catalyzed Mannich reaction-a classical reaction from the synthetic organic repertoire-of complexes 1, which are readily available by means of a fulvene route.
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Knuppel et al. (1999) studied this question.
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