Highly Tactic Cyclic Polynorbornene: Stereoselective Ring Expansion Metathesis Polymerization of Norbornene Catalyzed by a New Tethered Tungsten-Alkylidene Catalyst

The tungsten alkylidyne [ t BuOCO]­WC­( t Bu) (THF)2 (1) reacts with CO2, leading to complete cleavage of one CO bond, followed by migratory insertion to generate the tungsten-oxo alkylidene 2. Complex 2 is the first catalyst to polymerize norbornene via ring expansion metathesis polymerization to...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2016-04, Vol.138 (15), p.4996-4999
Main Authors: Gonsales, Stella A, Kubo, Tomohiro, Flint, Madison K, Abboud, Khalil A, Sumerlin, Brent S, Veige, Adam S
Format: Article
Language:English
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Summary:The tungsten alkylidyne [ t BuOCO]­WC­( t Bu) (THF)2 (1) reacts with CO2, leading to complete cleavage of one CO bond, followed by migratory insertion to generate the tungsten-oxo alkylidene 2. Complex 2 is the first catalyst to polymerize norbornene via ring expansion metathesis polymerization to yield highly cis-syndiotactic cyclic polynorbornene.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.6b00014