A Novel Tetralithium Salt of a Tetraanion and a Dilithium Salt of a Dianion, Formed by the Reduction of the Tetrasilylethylene Moiety. Synthesis, Characterization, and Observation of an Si-H···Li<sup>+</sup>Interaction
作者:Tsukasa Matsuo、Hidetoshi Watanabe、Akira Sekiguchi
DOI:10.1246/bcsj.73.1461
日期:2000.7
exhibits a highly folded structure due to the steric repulsion of the trimethylsilyl groups. Treatment of 1 and 3 with lithium metal yielded the corresponding tetralithium salts of the tetraanions 4 and 5, in which the two tetrasilylethylene units were subjected to two-electron reduction. 2,3-Bis(dimethylsilyl)-1,1,4,4-tetramethyl-1,4-disila-1,4-dihydronaphthalene (6), which has a half unit of 1, was reacted
2,3,6,7-Tetrakis(trimethylsilyl)-1,1,4,4,5,5,8,8-octamethyl-1,4,5,8-tetrasila-1,4,5,8-四氢蒽(3)由2,3,6,7-四(二甲基甲硅烷基)-1,1,4,4,5,5,8,8-八甲基-1,4,5,8-四甲硅烷基-1开始制备, 4,5,8-四氢蒽 (1)。1 和 3 的分子结构已通过 X 射线晶体学确定。化合物 1 具有几乎平面结构,而化合物 3 由于三甲基甲硅烷基的空间排斥而表现出高度折叠的结构。1 和 3 用锂金属处理产生相应的四阴离子 4 和 5 的四锂盐,其中两个四甲硅烷基乙烯单元进行双电子还原。2,3-双(二甲基甲硅烷基)-1,1,4,4-四甲基-1,4-二硅烷-1,4-二氢萘(6),其半单元为1,与锂金属反应得到二价阴离子的二锂盐 (7)。还给出了 Si-H 与 4 和 7 的 Li+ 离子在固态和溶液中相互作用的证据。