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The highly electrophilic boranes HB(C6F5)2 and B(C6F5)3 are effective reagents for generating a variety of zwitterionic olefin polymerization catalysts. The former borane can be used to incorporate Lewis acid activators into ancillary ligand structures via hydroboration of pendant olefinic functions; alternatively, direct reaction with simple organozirconocenes can lead to a family of hydridoborate...
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