Ruthenium-Catalyzed Cascade Metathetical Cyclopolymerization of Bisnorbornenes with Flexible Linkers

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• 作者：Lei Zhu ; Nai-Ti Lin ; Zhen-Yu Xie ; Shern-Long Lee ; Shou-Ling Huang ; Jian-He ; Yang ; Yu-Der ; Lee ; Chun-hsien Chen ; Chung-Hsuan Chen ; Tien-Yau Luh
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：February 12, 2013
• 年：2013
• 卷：46
• 期：3
• 页码：656-663
• 全文大小：507K
• 年卷期：v.46,no.3(February 12, 2013)
• ISSN：1520-5835

文摘

Treatments of bisnorbornenes tethered by a flexible linker (triethylene glycol, tetramethylene moiety, or crown ether) with the first generation of Grubbs catalyst give the corresponding single-stranded polybisnorbornenes via cascade metathetical cyclopolymerization (CMCP). The structures of these polymers were proved by spectroscopic means, MALDI-TOF mass spectrometry, gel permeation chromatography, and dynamic light scatterings as well as by chemical degradation via hydrolysis followed by esterification. The presence of N-aryl pendants to connect the norbornene moiety and the flexible linker is crucial for the success of such CMCP process. Presumably, intramolecular 蟺鈥撓€ interactions between the pending aryl groups may take place to direct the ring closure process. Substrates without such N-aryl pendants give a mixture of single- and double-stranded polynorbornenes in addition to cross-linking polymers.