Cis, Isotactic Selective ROMP of Norbornenes Fused with N-Arylpyrrolidines. Double Stranded Polynorbornene-Based Ladderphanes with Z-Double Bonds

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• 作者：Lei Zhu ; Margaret M. Flook ; Shern-Long Lee ; Li-Wei Chan ; Shou-Ling Huang ; Ching-Wen Chiu ; Chun-Hsien Chen ; Richard R. Schrock ; Tien-Yau Luh
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：October 23, 2012
• 年：2012
• 卷：45
• 期：20
• 页码：8166-8171
• 全文大小：360K
• 年卷期：v.45,no.20(October 23, 2012)
• ISSN：1520-5835

文摘

Upon treatment with a molybdenum-carbene with bidentate substituted biaryl-o,o鈥?diphenoxide ligand 12, norbornene fused with N-aryl-endo-pyrrolidine 9a undergoes ROMP to give exclusively polynorbornene with cis, isotactic-selectivity. Bis(norbornenes) connected with ferrocene 18 or benzene 20 linkers yield the corresponding double-stranded ladderphanes 19 and 21, respectively with isotactic stereochemistry having all double bonds in Z-configuration. Like the corresponding ladderphanes with E-double bonds, ladderphane 19 also assembles on HOPG to give a highly ordered two-dimensional array as revealed by STM images.