Cross‐linked poly(
<i>N</i>
‐vinylpyrrolidone)‐titanium tetrachloride complex: A novel stable solid TiCl
<sub>4</sub>
equivalent as a recyclable polymeric Lewis acid catalyst for regioselective ring‐opening alcoholysis of epoxides
作者:Ali Rahmatpour、Seyed Mehrzad Sajjadinezhad
DOI:10.1002/aoc.6385
日期:2021.11
thermogravimetric analysis (TGA) techniques. Moreover, the catalyst is very stable, easily separated, and reused at least five times without significant loss of activity. In terms of scope, yields, the amount of catalyst used, and reaction time, the PNVP-TiCl4 complex catalyst is an improvement over previously reported heterogeneous catalysts for ring opening of epoxides methods. Further, the experimental outcome
通过N-乙烯基-2-吡咯烷酮和作为交联剂的N,N'-亚甲基双丙烯酰胺(MBA)在水中悬浮共聚,制备交联聚(N-乙烯基吡咯烷酮)树脂珠作为大分子配体前体。随后,所得聚合物载体前体很容易与四氯化钛结合形成稳定的聚合物配位络合物 (PNVP/TiCl 4 ),这种新型稳定的 TiCl 4等效物被评估为非均相和可重复使用的固体路易斯酸催化剂,用于区域选择性和立体选择性各种环氧化物与各种醇的亲核开环制备β-烷氧基醇以优异的收率不产生任何废物。MBA 交联的 PNVP 和所得催化剂通过傅里叶变换红外光谱 (FT-IR)、场发射扫描电子显微镜 (FE-SEM)、能量色散 X 射线 (EDX)、电感耦合等离子体 (ICP) 进行表征和热重分析 (TGA) 技术。此外,该催化剂非常稳定,易于分离,可重复使用至少五次而不会显着损失活性。在范围、收率、催化剂用量和反应时间方面,PNVP-TiCl 4复杂催化剂是