Synthesis, Structures, and Reactions of 1,2,3-Tris(diethylamino)-1,2,3,4-tetrakis(1,1,2-trimethylpropyl)cyclotetrasilanes
作者:Masafumi Unno、Ryoji Tanaka、Toshie Kuribara、Mina Saito、Hideyuki Matsumoto
DOI:10.1246/bcsj.70.2749
日期:1997.11
The reaction of dichloro(diethylamino)thexylsilane (thexyl = 1,1,2-trimethylpropyl) with lithium gave 1,2,3-tris(diethylamino)-1,2,3,4-tetrathexylcyclotetrasilane (2) as a mixture of four diastereomers (r-1,t-2,c-3,t-4-2, r-1,t-2,t-3,t-4-2, r-1,t-2,c-3,c-4-2, and r-1,c-2,t-3,t-4-2). The isomers were separated and identified by 1H, 13C, and 29Si NMR, IR, Mass, and UV spectroscopy. The structures of r-1,t-2,c-3,t-4-2, r-1,t-2,t-3,t-4-2, and r-1,t-2,c-3,c-4-2 were confirmed by X-ray crystallography. The Si–Si bond lengths are 2.391(1)—2.499(2) Å for r-1,t-2,c-3,t-4-2, 2.389(2)—2.478(1) Å for r-1,t-2,t-3,t-4-2, and 2.397(2)—2.485(2) Å for r-1,t-2,c-3,t-4-2. In these molecules, there is a significant change in the structures of the Si4 frameworks; the dihedral angles were 18° for r-1,t-2,c-3,t-4-2, 34° for r-1,t-2,t-3,t-4-2, and 3° for r-1,t-2,c-3,t-4-2. The chlorodeamination or bromodeamination of 2 with HCl or HBr afforded 1,2,3-trichloro-1,2,3,4-tetrathexylcyclotetrasilane or 1,2,3-tribromo-1,2,3,4-tetrathexylcyclotetrasilane, respectively. Also, a tetrachlorocyclotetrasilane, 1,2,3,4-tetrachloro-1,2,3,4-tetrathexylcyclotetrasilane was obtained via cyclotetrasilanyllithium.
二氯(双乙基氨基)四烷基硅烷(四烷基 = 1,1,2-三甲基丙基)与锂的反应生成了1,2,3-三(双乙基氨基)-1,2,3,4-四四烷基环四硅烷(2),其为四种非对映体的混合物(r-1,t-2,c-3,t-4-2,r-1,t-2,t-3,t-4-2,r-1,t-2,c-3,c-4-2,以及r-1,c-2,t-3,t-4-2)。这些异构体通过1H、13C和29Si NMR、红外光谱、质谱和紫外光谱进行了分离和鉴定。r-1,t-2,c-3,t-4-2、r-1,t-2,t-3,t-4-2和r-1,t-2,c-3,c-4-2的结构通过X射线单晶衍射确认。r-1,t-2,c-3,t-4-2的Si-Si键长为2.391(1)—2.499(2) Å,r-1,t-2,t-3,t-4-2为2.389(2)—2.478(1) Å,r-1,t-2,c-3,t-4-2为2.397(2)—2.485(2) Å。在这些分子中,Si4框架的结构发生了显著变化;r-1,t-2,c-3,t-4-2的二面角为18°,r-1,t-2,t-3,t-4-2为34°,而r-1,t-2,c-3,t-4-2为3°。通过HCl或HBr对2的氯脱胺或溴脱胺反应分别得到了1,2,3-三氯-1,2,3,4-四四烷基环四硅烷或1,2,3-三溴-1,2,3,4-四四烷基环四硅烷。此外,通过环四硅烷锂化合物获得了四氯环四硅烷,1,2,3,4-四氯-1,2,3,4-四四烷基环四硅烷。