Zinc complexes supported by claw-type aminophenolate ligands: synthesis, characterization and catalysis in the ring-opening polymerization of rac-lactide
作者:Shaodi Song、Xingyu Zhang、Haiyan Ma、Yang Yang
DOI:10.1039/c2dt11767c
日期:——
alkyl initiating group. All zinc silylamido complexes efficiently initiated the ring-openingpolymerization of rac-lactide in the presence or absence of isopropanol at ambient temperature. The steric and electronic characteristics of the ancillary ligands significantly influenced the polymerization performance of the corresponding zinccomplexes. The introduction of bulky ortho- substituents on the phenoxy
一系列带有爪型多齿氨基酚盐配体[LZnN(SiMe 3)2 ](L = –OAr 1 -CH 2 N [(CH 2)n NR 2 ] CH 2 Ar 2,n = 2或3; R = Me或Et(1a-3a,5a,7a和8a); L = -OC 6 H 2 -4,6- t Bu 2 -2-CH 2 N [(CH 2)2 OMe] 2(9a)),是通过Zn [N(SiMe 3)2 ] 2与1当量的反应合成的。的对应氨基苯酚。Zn [N(SiMe 3)2 ] 2与配体L 6 H(2- N-(2-甲氧基苄基)-N- [3-(N ',N'-二甲基氨基)丙基]氨基甲基}-的反应不管两种起始材料的化学计量比如何,4-甲基-6-三苯甲基苯酚)都形成了双酚盐锌络合物6。得到具有3-叔丁基-2-甲氧基-5-甲基苄氧基的起始基团的配合物4b,并通过X射线衍射法进一步研究其为单体。锌乙基络合物2cZnEt 2和