Geometry Change in a Series of Zirconium Compounds during Lactide Ring-Opening Polymerization

被引：17

作者：

Dai, Ruxi ^{[1
]}

Lai, Amy ^{[1
]}

Alexandrova, Anastassia N. ^{[1
]}

Diaconescu, Paula L. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA

来源：

ORGANOMETALLICS | 2018年 / 37卷 / 21期

关键词：

REDOX-SWITCHABLE COPOLYMERIZATION; CYCLIC ESTERS; BASIS-SETS; COMPLEXES; TETRADENTATE; INITIATORS; POLYMERS; TITANIUM; LIGANDS; CATALYSTS;

D O I：

10.1021/acs.organomet.8b00620

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new series of zirconium compounds, (salfen)Zr((OBu)-Bu-t)(2) (salfen = N,N'-bis(2,4-di-tert-butylphenoxy)-1,1'-ferrocenediimine), (salfen)Zr((OPr)-Pr-i)(2), and (salfen)Zr((OPr)-Pr-n)(2), was synthesized and characterized, featuring a cis-beta coordination geometry for the major isomer found in solution. An isomerization between the trans and cis-beta coordination geometry was observed at ca. 100 degrees C in solution. This isomerization was also observed in the presence of L-lactide (LA) before its ring-opening polymerization could occur. The isolation of a (salfen)Zr((OPr)-Pr-n)(2) lactide intermediate supports the change to the trans coordination geometry necessary before polymerization.

引用

页码：4040 / 4047

页数：8

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