Chiral Indium Alkoxide Complexes as Initiators for the Stereoselective Ring-Opening Polymerization of <i>rac</i>-Lactide
作者:Jean-Charles Buffet、Jun Okuda、Polly L. Arnold
DOI:10.1021/ic900740n
日期:2010.1.18
and InL3, respectively. Confirmation that the anion L− exhibits “ligand self-recognition” in the formation of predominantly homochiral complexes RR-InL2N′′ and SS-InL2N′′ is obtained from 1H and 31P NMR spectroscopic data. However, the self-recognition is less effective at the indium cation, and mixtures of InL3 complexes with different configurations are observed. Single-crystal X-ray diffraction
该铟复合物INL 2 N''已经从2当量(的反应制备吨丁基)2 P(O)CH 2 CH(吨'卜)OH(HL)以InN' 3(N''= N( SiMe 3)2)。该配合物与另外等价的2,6-二叔丁基苯酚或HL反应,分别得到加合物InL 2(OAr)和InL 3。确认该阴离子大号-展品“配体自识别”中的主要同手性络合物的形成RR -InL 2 N''和SS- INL 2N''是从1 H和31 P NMR光谱数据获得的。然而,自我识别在铟阳离子上的效果较差,并且观察到具有不同构型的InL 3络合物的混合物。单晶X射线衍射数据证实了InL 2 N''和InL 2(OAr)的五坐标扭曲双锥体In中心。InL 3的选定晶体显示两种可能的构型:一种是fac-RRR -InL 3络合物,类似于先前报道的镧系元素络合物LnL 3(Ln = Y,Eu,Er,Yb);另一个是替代方案中,纯手性形式聚体RRR '