Oligo or poly? A mechanistic interpretation of a switchable catalyst
Abstract
It is not uncommon to find catalytic systems for which changes in the ligand environment - even apparently quite minor ones - bring about a complete switchover between olefin oligomerization and polymn., but explanations of such effects on a detailed structural and mechanistic level are not so common. We have found that activation of the dibenzylzirconium complex 1 by abstraction of a benzyl group in the absence or presence of an addnl. ligand L can generate a catalyst for oligomerization or polymn. of 1-hexene, or neither, depending on the mode of activation and the nature of L. From structural characterization of intermediates by NMR and X-ray crystallog. along with end-group anal. of oligomers and polymers, we can construct a mechanistic model that satisfactorily accounts for the variety of obsd. behaviors.
Additional Information
© 2016 American Chemical Society.Additional details
- Eprint ID
- 65896
- Resolver ID
- CaltechAUTHORS:20160404-131859602
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2016-04-05Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field