Journal
ORGANOMETALLICS
Volume 32, Issue 18, Pages 5136-5143Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om400704h
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Funding
- NSF [CHE-1010170]
- Welch Foundation [E-1571]
- Norman Hackerman Advanced Research Program
- China Scholarship Council
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1010170] Funding Source: National Science Foundation
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Nickel(II) alpha-diimine dibromide complexes incorporating 8-p-tolylnaphthylimino groups have been prepared and used for ethylene polymerization by activation with modified methylalumoxane (MMAO). These catalysts possess increased axial bulk relative to standard diimine-nickel complexes, resulting in lower rates of chain transfer relative to chain propagation rates and thus higher polymer molecular weights and narrower PDIs. They yield the most highly branched PE produced by Ni catalysts seen to date. The easy synthesis of 8-aryl-1-naphthylamines provides ready access to a new class of alpha-diimine-based nickel catalysts in which the 8-substituent is ideally positioned to provide steric bulk at the axial sites.
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