Stereospecific Ring-Opening Metathesis Polymerization of Norbornadienes Employing Tungsten Oxo Alkylidene Initiators
作者:William P. Forrest、Jonathan G. Weis、Jeremy M. John、Jonathan C. Axtell、Jeffrey H. Simpson、Timothy M. Swager、Richard R. Schrock
DOI:10.1021/ja506446n
日期:2014.8.6
here the polymerization of several 7-isopropylidene-2,3-disubstituted norbornadienes, 7-oxa-2,3-dicarboalkoxynorbornadienes, and 11-oxa-benzonorbornadienes with a single tungsten oxo alkylidene catalyst, W(O)(CH-t-Bu)(OHMT)(Me2Pyr) (OHMT = 2,6-dimesitylphenoxide; Me2Pyr = 2,5-dimethylpyrrolide) to give cis, stereoregular polymers. The tacticities of the menthyl ester derivatives of two polymers were determined
我们在此报告了几种 7-isopropidene-2,3-di 取代的降冰片二烯、7-oxa-2,3-dicarboalkoxynorbornadienes 和 11-oxa-benzonorbornadienes 与单一钨氧亚烷基催化剂 W(O)(CH-t -Bu)(OHMT)(Me2Pyr)(OHMT = 2,6-dimesitylphenoxide;Me2Pyr = 2,5-二甲基吡咯烷)得到顺式、有规立构聚合物。测定了两种聚合物的薄荷酯衍生物的立构规整度。对于聚(7-异亚丙基-2,3-二碳化薄荷氧基降冰片二烯),其结构显示为顺式、全同立构,而对于聚(7-氧杂-2,3-二碳化薄荷氧基降冰片二烯),其结构显示为顺式、间同立构。双-三氟甲基-7-异亚丙基降冰片二烯未单独与 W(O)(CHCMe2Ph)(Me2Pyr)(OHMT) 立体规则聚合,而是在 1 当量 B(C6F5)3 存在下形成顺式立体规则聚合物。