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

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• 作者：Stella A. Gonsales ; Tomohiro Kubo ; Madison K. Flint ; Khalil A. Abboud ; Brent S. Sumerlin ; Adam S. Veige
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：138
• 期：15
• 页码：4996-4999
• 全文大小：361K
• 年卷期：0
• ISSN：1520-5126

文摘

The tungsten alkylidyne [^tBuOCO]W≡C(^tBu) (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.