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Development of chromium compounds supported by chelating multi-aryl ligands for selective ethylene oligomerization

Hirscher, Nathanael and Lifschitz, Alejo and Bryan, Aimee and Agapie, Theodor (2016) Development of chromium compounds supported by chelating multi-aryl ligands for selective ethylene oligomerization. In: 251st American Chemical Society National Meeting & Exposition, March 13-17, 2016, San Diego, CA.

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1-octene and 1-hexene are valuable monomers in copolymn. with ethylene, for the prodn. of linear low-d. polyethylene. Cr-bisphosphinoamine (PNP) catalysts oligomerize ethylene to 1-octene and 1-hexene via a metallacyclic mechanism. Such systems require large excesses of aluminum-based activators, making it difficult to study the mechanism of catalyst initiation. This has been a significant hindrance to developing selective oligomerization catalysts for industrial applications. Chromium precursors displaying Cr-aryl or Cr-alkyl bonds have previously been employed in mechanistic studies. However, the isolation of similar Cr compds. supported by PNP ligands without pendant donors has proven challenging. In this work, the synthesis of a series of novel Cr(III) multi-aryl compds. is reported. Their reactivity with ethylene is investigated, with particular attention paid to the products of ethylene insertion into these Cr-C aryl bonds. These studies provide insight into the activation mechanism of these compds. toward oligomerization catalysis.

Item Type:Conference or Workshop Item (Paper)
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Agapie, Theodor0000-0002-9692-7614
Additional Information:© 2016 American Chemical Society.
Record Number:CaltechAUTHORS:20160404-131622641
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65895
Deposited By: Tony Diaz
Deposited On:05 Apr 2016 16:47
Last Modified:03 Oct 2019 09:51

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