Highly Stereoregular 1,3-Butadiene and Isoprene Polymers through Monoalkyl-<i>N-</i>Aryl-Substituted Iminopyridine Iron Complex-Based Catalysts: Synthesis and Characterization
作者:Giovanni Ricci、Giuseppe Leone、Giorgia Zanchin、Benedetta Palucci、Antonella Caterina Boccia、Anna Sommazzi、Francesco Masi、Stefano Zacchini、Massimo Guelfi、Guido Pampaloni
DOI:10.1021/acs.macromol.1c01291
日期:2021.11.9
and poly(isoprene)s with a predominantly cis-1,4/3,4 alternating structure, in which short cis-1,4 sequences of three or five units, whose length depends on the nature of the ligand on the iron atom, are present. A detailed NMR characterization (1H-, 13C-, and 2D experiments) of the resultant poly(isoprene)s is reported, and a tentative scheme for the formation of the novel isoprene polymers is proposed
合成并表征了一些新的单烷基-N-芳基取代的亚氨基吡啶氯化铁络合物,其在亚胺碳和芳环的邻位取代基的性质不同。对于其中之一,获得了单晶,这可以确定其晶体结构,其中铁中心与氯化物和配体的两个氮原子配位。铁周围的配位是扭曲的四面体,FeCl 2很少发现配位模式与二齿氮配体的加合物。所有配合物都与甲基铝氧烷结合使用,用于 1,3-丁二烯和异戊二烯的聚合,提供间同立构 1,2 聚(1,3-丁二烯)和聚(异戊二烯),主要为顺式-1, 4/3,4 交替结构,其中存在三个或五个单元的短顺式-1,4 序列,其长度取决于铁原子上配体的性质。报告了所得聚(异戊二烯)的详细 NMR 表征(1 H-、13 C- 和 2D 实验),并提出了形成新型异戊二烯聚合物的暂定方案。