Highly Active Iminopyridyl Iron-Based Catalysts for the Polymerization of Isoprene
作者:Obaid H. Hashmi、Yohan Champouret、Marc Visseaux
DOI:10.3390/molecules24173024
日期:——
(II) complexes were developed to investigate their application in the controlled coordinative polymerization of isoprene. The modulation of steric and electronic properties within this family of ligands/pre-catalysts has shown to influence the stereo-selectivity and activity of the polymerization of isoprene after activation. Upon activation with various co-catalysts such as AliBu3/[Ph3C][B(C6F5)4],
500 h-1) 并具有各种立体/区域规则。在异戊二烯聚合过程中,给电子和吸电子基团的存在极大地影响了催化剂的活性和立体选择性。当用 AliBu3/[Ph3C][B(C6F5)4] 激活时,配合物 6-[(2,6-Me2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C1) 和 6 -[(2,6-iPr2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C2) 表现出中等的 trans-1,4 选择性 (>67%) 而带有相关醛亚氨基吡啶配体的铁基系统6-[(2,6-Me2-C6H3)N=C(H)]-2-C6H5N}FeCl2 (C3) 和 6-[(2,6-iPr2-C6H3)N=C(H)] -2-C6H5N}FeCl2 (C4) 被发现在低温下(-40 °C 时 >86%)具有显着的 cis-1,4 选择性。另一方面,三元 6-[(3,