Synthesis and NMR-Study of 1-Trimethylsilyl Substituted Silole Anion [Ph4C4Si(SiMe3)]−•[Li]+ and 3-Silolenide 2,5-carbodianions {[Ph4C4Si(n-Bu)2]−2•2[Li]+, [Ph4C4Si(t-Bu)2]−2•2[Li]+} via Silole Dianion [Ph4C4Si]−2•2[Li]+
作者:Jang-Hwan Hong
DOI:10.3390/molecules180910568
日期:——
1-Trimethylsilyl, 1-R (R = Me, Et, i-Bu)-2,3,4,5-tetraphenyl-1-silacyclopentadiene [Ph4C4Si(SiMe3)R] are synthesized from the reaction of 1-trimethylsilyl,1-lithio-2,3,4,5-tetraphenyl-1-silacyclopentadienide anion [Ph4C4SiMe3]−•[Li]+ (3) with methyl iodide, ethyl iodide, and i-butyl bromide. The versatile intermediate 3 is prepared by hemisilylation of the silole dianion [Ph4C4Si]−2•2[Li]+ (2) with trimethylsilyl chloride and characterized by 1H-, 13C-, and 29Si-NMR spectroscopy. 1,1-bis(R)-2,3,4,5-tetraphenyl-1-silacyclopentadiene [Ph4C4SiR2] R = n-Bu (7); t-Bu (8)} are synthesized from the reaction of 2 with n-butyl bromide and t-butyl bromide. Reduction of 7 and 8 with lithium under sonication gives the respective 3-silolenide 2,5-carbodianions [Ph4C4Si(n-Bu)2]−2•2[Li]+ (10) and [Ph4C4Si(t-Bu)2]−2•2[Li]+ (11)}, which are characterized by 1H-, 13C-, and 29Si-NMR spectroscopy. Polarization of phenyl groups in 3 is compared with those of silole anion/dianion, germole anion/dianion, and 3-silolenide 2,5-carbodianions 10 and 11.
1-三甲基硅、1-R(R = Me、Et、i-Bu)-2,3,4,5-四苯基-1-硅杂环戊二烯[Ph4C4Si(SiMe3)R]由 1-三甲基硅与甲基碘反应合成、1-三甲基硅、1-硫代-2,3,4,5-四苯基-1-硅杂环戊二烯阴离子 [Ph4C4SiMe3]--[Li]+ (3) 与甲基碘、乙基碘和溴化 i-丁基的反应合成。多功能中间体 3 是通过硅烯二阴离子 [Ph4C4Si]-2-2[Li]+ (2) 与三甲基氯硅烷的半硅烷化反应制备的,并通过 1H-、13C- 和 29Si-NMR 光谱进行表征。1,1-bis(R)-2,3,4,5-tetraphenyl-1-silacyclentadiene [Ph4C4SiR2] R = n-Bu (7); t-Bu (8)} 是由 2 与正丁基溴和叔丁基溴反应合成的。在超声条件下用锂还原 7 和 8,得到了各自的 3-硅烯内 2,5-碳二酸酯[Ph4C4Si(n-Bu)2]-2-2[Li]+ (10) 和 [Ph4C4Si(t-Bu)2]-2-2[Li]+ (11)},并用 1H-、13C- 和 29Si-NMR 光谱对其进行了表征。将 3 中苯基的极化与硅烯阴离子/二阴离子、胚芽烯阴离子/二阴离子以及 3-硅烯内 2,5- 碳二离子 10 和 11 的极化进行了比较。