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Highly electrophilic metallocenes and their role in alkene polymerizations

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Abstract

This summary explores three main topics: (1) zwitterionic alternatives to cationic metallocene alkyl complexes as olefin polymerization catalysts, based on borato (–BR -3 ) and boryl (–BR2) substituted cyclopentadienyl ligands (R = C6F5); including zwitterionic zirconium allyl complexes of the type CpZr(η3-allyl){η3-allyl–CH2B(C6F5)3}; (2) reactions which contribute to catalyst deactivation, notably aluminum alkyl mediated C6F5 transfer reactions as well as C–H activation reactions including an unusual case of catalyst self-reactivation; (3) the role of highly electrophilic metallocene complexes of aluminum, zirconium and yttrium in combination with weakly coordinating anions as initiators for the carbocationic polymerization of isobutene and isobutene–isoprene copolymerizations is discussed.

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    Manfred Bochmann

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Bochmann, M. Highly electrophilic metallocenes and their role in alkene polymerizations. Topics in Catalysis 7, 9–22 (1999). https://doi.org/10.1023/A:1019151414397

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