An Unexpected Elimination of Cyclopentadienide Anion in the Reaction of Silacyclohexadienes with a Bulky Aryllithium
作者:Keiji Wakita、Norihiro Tokitoh、Renji Okazaki
DOI:10.1246/cl.1998.687
日期:1998.7
The reaction of silacyclohexadienes with an extremely hindered aryllithium, TbtLi (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl), gave no expected Tbt-subsituted silacyclohexadienes but trihydrosilane, TbtSiH3, via the elimination of cyclopentadienide anion. By contrast, 1,1-difluoro-1-silacyclohexa-2,4-diene underwent a normal substitution though the yield was very low.
硅杂环己二烯与受阻极强的芳基锂 TbtLi(Tbt = 2,4,6-三[双(三甲基甲硅烷基)甲基]苯基)的反应没有产生预期的 Tbt 取代的硅杂环己二烯,而是通过消除环戊二烯阴离子得到三氢硅烷 TbtSiH3。相比之下,1,1-二氟-1-硅杂环六-2,4-二烯虽然产率非常低,但进行了正常的取代。