Synthesis, crystal structure, and chirality of divalent lanthanide reagents containing tri- and tetraglyme

被引：19

作者：

Vestergren, M

Gustafsson, B

Johansson, A

Håkansson, M

机构：

[1] Univ Gothenburg, Dept Chem, SE-41296 Gothenburg, Sweden

[2] Chalmers, Dept Mat & Surface Chem, SE-41296 Gothenburg, Sweden

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2004年 / 689卷 / 10期

基金：

瑞典研究理事会;

关键词：

lanthanide; triglyme; tetraglyme; crystal structure;

D O I：

10.1016/j.jorganchem.2003.12.046

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Six new divalent lanthanide complexes using triglyme (trigly) and tetraglyme (tetgly) as achiral ligands have been prepared, using a facile synthetic method, in search for enantioselective solid-state reagents. The crystal structures of cis-[SmI2(trigly)thfl] (1), trans[YbI2(trigly)thf] (2), trans-[SMI2(trigly)dme] (3), trans-[YbI2(tetgly)] (4), trans-[EuI2(tetgly)thfl] (5), and [SM(tetgly)2][SMI3(tetgly)]I (6) have been determined. All complexes, except 5, are chiral. The 10-coordinate cation in 6 displays a helical chirality since the two tetraglyme ligands are wrapped around the samarium ion. Since trans-[YbI2(tetgly)] (4), which has a chiral arrangement of terminal methyl groups, crystallizes as a conglomerate, preferential crystallization and consequent enantioselective reduction of acetophenone was attempted, but resulted in racemic products, possibly on account of racemic twinning in 4. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1723 / 1733

页数：11

共 28 条

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