STRUCTURES OF STERICALLY OVERCROWDED AND CHARGE-PERTURBED MOLECULES .9. THE 2-ELECTRON REDUCTION OF 1,1'-DIPHENYLETHENE BY LITHIUM OR SODIUM TO DIFFERENT 1,1,4,4-TETRAPHENYLBUTANE-1,4-DIIDE SALTS VIA C-C BOND FORMATION - A MONOMERIC DILITHIUM CONTACT ION TRIPLE AND A POLYMER STRING OF HYDROCARBON OYSTERS CONTAINING SOLVATED SODIUM PEARLS

被引:25
作者
BOCK, H [1 ]
RUPPERT, K [1 ]
HAVLAS, Z [1 ]
BENSCH, W [1 ]
HONLE, W [1 ]
VONSCHNERING, HG [1 ]
机构
[1] MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 80,GERMANY
来源
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH | 1991年 / 30卷 / 09期
关键词
D O I
10.1002/anie.199111831
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The reduction of 1,1-diphenylethene with alkali metals to give 1,1,4,4-tetraphenylbutane has model character for the course of anionic styrene copolymerization. It has been possible to grow single crystals of the air-sensitive dianionic intermediates and to determine their structure. The structures of the butane-1,4-diide salts are decisively influenced by the radii of the counterions: in the momomeric dilithium contact ion triple, an anti-periplanar -C-H2C-CH2-C- chain is present. In comparison the polymer strand of the disodium salt consists of contact ion pair anions, which form intramolecular Na+-diphenyl sandwhich units with synclinal butane conformation, and are coupled via further ether-coordinated Na+ counterions.
引用
收藏
页码:1183 / 1186
页数:4
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