Radical and Ring-Opening Polymerizations with Aryl-Substituted Methylene-Bridged Titanium Bisphenolates
作者:Lihua Liu、Daniel Mendoza-Espinosa、Mauricio Quiroz-Guzmán、Arnold L. Rheingold、Tracy A. Hanna、Gobinda Saha、Liming Tang、Yanhui Chen、Megan Gilbert、Abhirup Dutta、Alexandru D. Asandei
DOI:10.1021/acs.organomet.3c00053
日期:2023.3.13
were investigated in both the controlled radical polymerization (CRP) of styrene and the living ring-opening polymerization (LROP) of ε-caprolactone (ε-CL). Zn reduction of [L0−L4, L6]TiCl2 and [L2, L6]TiCpCl produces Ti(III)• metalloradicals, which initiate via radical ring opening of epoxide precursors and mediate CRPs by reversible endcapping of polymer radicals. A linear dependence of molecular weight
一系列亚甲基桥联双酚配体,包括 2,2'-CH 2 (6- i Pr-C 6 H 3 -OH) 2 ( L0 ) 和 2,2'-CH 2 (4-CH 3 -6- t Bu-C 6 H 2 -OH) 2 ( L1 ), 芳基取代的L = CH Ar (4,6-di- t Bu-C 6 H 2 -OH) 2 ( Ar = C 6 H 5 -CH 2 - ( L2 ), 4-甲醇-C6 H 4 - ( L3 ), 3-MeO-C 6 H 4 - ( L4 ), 4-NO 2 -C 6 H 4 - ( L5 ), 2-MeO-5-Br-C 6 H 3 - ( L6 ), 4-Me-C 6 H 4 - ( L7 ), 4-CF 3 -C 6 H 4 - ( L8 ), 4-FC 6 H 4 - ( L9 )),各自的醛与 2,4-二叔-丁基苯酚,得到相应的 [ L ]TiCl 2 ( L0 − L4