N-Methylaniline-induced Si–Si bond cleavages of perchlorooligosilanes
摘要:
This study describes Si Si bond cleavage of perchlorooligosilane using an amine. N-Methylaniline-induced Si Si bond cleavage reactions of cyclic perchlorosilanes Si5Cl10 (1) and Si4Cl8 (2), and acyclic perchlorosilanes Si5Cl12 (3) and Si2Cl6 (4) yielded the N,N-methylphenylamino-substituted monosilanes, (NMePh)(3-n)SiHCln (5; n = 2, 6; n = 1, 7; n = 0) and (NMePh)(4-n)SiCln (8; n = 2, 9; n = 3). Products and yields depended on the perchlorooligosilanes used. In addition, disproportionation between Si N and Si Cl bonds was observed in reactions of compounds 5 and 9. (C) 2014 Elsevier B.V. All rights reserved.
(CPS) – a liquid silicon precursor – was crystallized in situ at − 100 °C which allowed determination of the single crystal X-ray structure, showing short intermolecular distances below the sum of the v.d.Waals radii of the corresponding atoms. Further characterization included a thermal analysis with mass spectrometry (TG/MS) of the segregated species hydrogen, mono- and disilane.
摘要 环戊硅烷 Si 5 H 10 (CPS) - 一种液态硅前体 - 在 - 100 °C 下原位结晶,这允许测定单晶 X 射线结构,显示出低于相应的 vdWaals 半径总和的短分子间距离原子。进一步的表征包括对分离的物质氢、甲硅烷和乙硅烷进行质谱 (TG/MS) 热分析。
The perhydropentasilanes (H3Si)(4)Si and Si5H10 were chlorinated with SnCl4 to give chlorohydropentasilanes without destruction of the Si-Si backbone. Tetrachloroneopentasilane (ClH2Si)(4)Si (2) was prepared in high yield from (H3Si)(4)Si and 3.5 equiv of SnCl4, while Si5H10 and an equimolar amount of SnCl4 afforded a mixture of similar to 60% of ClSi5H9 (1) with polychlorinated cyclopentasilanes and unreacted starting material, which could not be separated by distillation. The selective monochlorination of Si5H10 was achieved starting from MesSi(5)Cl(9) (3; Mes = 2,4,6-trimethylphenyl) or TBDMP-Si5Cl9 (4; TBDMP = 4-tert-butyl-2,6-dimethylphenyl). 3 or 4 was successfully hydrogenated with LiAlH4 to give MesSi(5)H(9) (6) or TBDMP-Si5H9 (7), which finally gave 1 along with aryl-H and Si5H10 after treatment with an excess of liquid anhydrous HCl. All compounds were characterized by standard spectroscopic techniques. For Si-H derivatives, the coupled Si-29 NMR spectra were analyzed in detail to obtain an unequivocal structural assignment. The molecular structures of 2-4 were further confirmed by X-ray crystallography.