Long-chain alkanes with an internal H2SiSiH2 linkage
摘要:
1,2-Bis(p-tolyl)disilane (2) has been prepared through Wurtz-coupling of chloro(p-tolyl)silane using lithium metal. It was used as a precursor for 1,2-bis(trifluoromethanesulfonyloxy)disilane (1), which was obtained by treatment with two equivalents of trifluoromethanesulfonic acid. This intermediate was treated with n-BuLi, n-HexLi or n-OctMgBr to give the title compounds (n-CnH2n+1)SiH2SiH2(n-CnH2n+1) (n = 4,6,8), 4a-c. Treatment of 2 with only one equivalent of triflic acid gave p-TolSiH(2)SiH(2)OSO(2)CF(3) (5), which can be selectively converted into mixed alkyl-aryl-disilanes with LiR reagents, e.g. (n-Bu)SiH2SiH2(p-Tol), 6. The crystal structure of compound 2 has been determined by an X-ray diffraction study; it has a staggered trans-conformation with a crystallographic center of inversion.
Long-chain alkanes with an internal H2SiSiH2 linkage
摘要:
1,2-Bis(p-tolyl)disilane (2) has been prepared through Wurtz-coupling of chloro(p-tolyl)silane using lithium metal. It was used as a precursor for 1,2-bis(trifluoromethanesulfonyloxy)disilane (1), which was obtained by treatment with two equivalents of trifluoromethanesulfonic acid. This intermediate was treated with n-BuLi, n-HexLi or n-OctMgBr to give the title compounds (n-CnH2n+1)SiH2SiH2(n-CnH2n+1) (n = 4,6,8), 4a-c. Treatment of 2 with only one equivalent of triflic acid gave p-TolSiH(2)SiH(2)OSO(2)CF(3) (5), which can be selectively converted into mixed alkyl-aryl-disilanes with LiR reagents, e.g. (n-Bu)SiH2SiH2(p-Tol), 6. The crystal structure of compound 2 has been determined by an X-ray diffraction study; it has a staggered trans-conformation with a crystallographic center of inversion.
Tailor-made synthesis of functional substituted oligo- and polysilanes from silyl triflates and (aminosilyl)lithium compounds
作者:Wolfram Uhlig
DOI:10.1016/s0022-328x(03)00158-x
日期:2003.11
reaction and the amino-to-triflate transformation, functionalized tri-, tetra-, penta- and hexasilanes have been synthesized. α,ω-Triflate substituted oligosilanes containing π-systems have also been obtained. These compounds are useful building blocks for new organosilicon polymers. The formation of the silicon polymers at low temperatures, in short reaction times, and with high yields is reported. The 29Si-NMR
Synthesis of Butane-Like SiGe Hydrides: Enabling Precursors for CVD of Ge-Rich Semiconductors
作者:Andrew V. G. Chizmeshya、Cole J. Ritter、Changwu Hu、Jesse B. Tice、John Tolle、Ronald A. Nieman、Ignatius S. T. Tsong、John Kouvetakis
DOI:10.1021/ja060428j
日期:2006.5.1
by varying the global intensity, frequency scale, and admixture coefficients of the individual conformers. The (GeH(3))(2)(SiH(2))(2) (1) species was then utilized to fabricate Si(0.50)Ge(0.50) semiconductor alloys reflecting exactly the Si/Ge content of the precursor. Device quality layers were grown via gas source MBE directly on Si(100) at unprecedented low temperatures 350-450 degrees C and display
1,2-Bis(p-tolyl)disilane (2) has been prepared through Wurtz-coupling of chloro(p-tolyl)silane using lithium metal. It was used as a precursor for 1,2-bis(trifluoromethanesulfonyloxy)disilane (1), which was obtained by treatment with two equivalents of trifluoromethanesulfonic acid. This intermediate was treated with n-BuLi, n-HexLi or n-OctMgBr to give the title compounds (n-CnH2n+1)SiH2SiH2(n-CnH2n+1) (n = 4,6,8), 4a-c. Treatment of 2 with only one equivalent of triflic acid gave p-TolSiH(2)SiH(2)OSO(2)CF(3) (5), which can be selectively converted into mixed alkyl-aryl-disilanes with LiR reagents, e.g. (n-Bu)SiH2SiH2(p-Tol), 6. The crystal structure of compound 2 has been determined by an X-ray diffraction study; it has a staggered trans-conformation with a crystallographic center of inversion.