苯并噻唑
催化作用
苯
化学
开环聚合
聚合
戒指(化学)
金属
极性效应
己内酯
药物化学
立体化学
高分子化学
有机化学
聚合物
作者
Chia-Hsiung Chang,Wei Lee,Yu-Chi Liou,Yu‐Lun Chang,Yi‐Chun Lai,Shangwu Ding,Hsuan-Ying Chen,Hsing-Yin Chen,Yung‐Chi Chang
标识
DOI:10.1016/j.eurpolymj.2022.111651
摘要
In this study, a series of mononuclear complexes and dinuclear aluminum complexes bridged by 1,3- and 1,4-substituted phenyl ligands were synthesized, and their activities for the ring-opening polymerization (ROP) of ε-caprolactone (CL) were investigated. All the dinuclear aluminum complexes exhibited higher catalytic activity than did the corresponding mononuclear Al complexes (2–6-fold for the kobs values), and most of the dinuclear Al complexes bearing 1,3-substituted phenyl ligands exhibited higher activity than did the corresponding dinuclear Al complexes bearing 1,4-substituted phenyl ligands (1.5–3-fold for the kobs values). The only exceptions were the Al complexes bearing benzothiazole ligands, for which the dinuclear Al complex with 1,4-bis(benzothiazol-2-yl)benzene exhibited higher catalytic activity than did the corresponding 1,3- bis(benzothiazol-2-yl)benzene complex. This higher activity of the dinuclear Al complexes was attributed to one of the Al atoms in the dinuclear Al system being regarded as an electron-withdrawing group. This group influenced the other Al atom through associated aromatic ligands to enhance the catalytic activity for the ROP of CL.
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