CRYSTAL-STRUCTURE OF A CARBANION-AMIDE COMBINATION WITH LITHIUM AND SODIUM-CATIONS

被引：11

作者：

HARDER, S ^{[1
]}

LUTZ, M ^{[1
]}

KREMER, T ^{[1
]}

机构：

[1] INST ORGAN CHEM,D-91054 ERLANGEN,GERMANY

来源：

ORGANOMETALLICS | 1995年 / 14卷 / 05期

关键词：

D O I：

10.1021/om00005a003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

In analogy with RLi/MOR' (M = Na, K, Rb, Cs) superbases, metal exchange in mixtures of (RLi)(2) and (MNR'(2))(2) to give (RM)(2) and (LiNR'(2))(2) is calculated to be exothermic. A small energy difference between complete metal exchange and the formation of mixed aggregates, RM/LiNR'(2), suggests a significant role of the latter. We prepared a mixed Li/Na carbanion-amide and studied the structure by single-crystal X-ray diffraction. The structure of this Li/Na carbanion-amide complex can. be described as a tetrameric cluster from units in which Li and Na cations bridge the carbanion and amide functionalities. The carbanion-amide bonding interactions with the Li cations are of major importance, whereas the Na cations are involved in weaker bonding. The different influence of amide anions and alkoxide anions on the structure of mixed aggregates provoked a comparative study on the superbasic properties of such systems.

引用

页码：2133 / 2135

页数：3

共 32 条

[1] AN UNPRECEDENTED MIXED-ALKALI METAL ORGANONITROGEN LADDER - SYNTHESIS, NMR SPECTROSCOPIC STUDIES, AND X-RAY CRYSTALLOGRAPHIC STUDIES OF THE DILITHIUM DISODIUM AMIDE [(LINA[N(CH2PH)2]2.OET2)2] [J].