Tetrasilyl-substituted cyclobutadiene dianion dilithium salt: synthesis and structure
作者:A. Sekiguchi、T. Matsuo、M. Tanaka、H. Watanabe、M. Nakamoto
DOI:10.1023/b:rucb.0000041308.25889.77
日期:2004.5
tetrakis(trimethylsilyl)cyclobutadienylcyclopentadienyl cobalt complex (Me3Si)4C4CoCp with lithium metal in THF yielded the dilithium salt of cyclobutadiene dianion CBD2– stabilized by four trimethylsilyl groups, Li+2[(Me3Si)4C4]2–. The bridged CBD2– dianion was also synthesized by a similar procedure starting from the bridged cobalt complex, which was prepared from the reaction of 2,2,5,5,8,8,11,11-octamethyl-2
四(三甲基甲硅烷基)环丁二烯基环戊二烯基钴配合物 (Me3Si)4C4CoCp 与锂金属在 THF 中的反应产生了环丁二烯二价阴离子 CBD2- 的二锂盐,由四个三甲基甲硅烷基团 Li+2[(Me3Si)4C4]2- 稳定。桥接的 CBD2-二价阴离子也通过类似的程序从桥接的钴配合物开始合成,该配合物由 2,2,5,5,8,8,11,11-octamethyl-2,5,8 的反应制备, 11-tetrasilacyclododeca-1,6-diyne 与 CpCo(CO)2 在回流辛烷中。CBD2- 的芳香性是在结构特征和磁性的基础上讨论的。