(2,4,6,8-tetraethoxy)-2,4,6,8-tetramethylcyclooctatetrasiloxane | 18082-63-8

• 分子结构分类: 有机化合物 - 有机金属化合物 - 有机类金属化合物
• 英文名称: (2,4,6,8-tetraethoxy)-2,4,6,8-tetramethylcyclooctatetrasiloxane
• 英文别名: 2,4,6,8-tetraethoxy-2,4,6,8-tetramethyl-cyclotetrasiloxane；2,4,6,8-Tetraaethoxy-2,4,6,8-tetramethyl-cyclotetrasiloxan；2,4,6,8-tetramethyl-2,4,6,8-tetraethoxycyclotetrasiloxane；LS-8680；Tetraethoxy-tetramethylcyclotetrasiloxan；2,4,6,8-Tetraethoxy-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
• CAS: 18082-63-8
• 化学式: C₁₂H₃₂O₈Si₄
• 分子量: 416.723
• InChiKey: HZVMJOQPNGGDKO-UHFFFAOYSA-N

物化性质

• 沸点：
  283.5±23.0 °C(Predicted)
• 密度：
  1.04±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.49
• 重原子数：
  24
• 可旋转键数：
  8
• 环数：
  1.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  73.8
• 氢给体数：
  0
• 氢受体数：
  8

反应信息

• 作为反应物：
  描述：

  (2,4,6,8-tetraethoxy)-2,4,6,8-tetramethylcyclooctatetrasiloxane 在 盐酸 、 ammonium hydroxide 、 air 作用下， 以 水 为溶剂， 生成 silica gel
  参考文献：
  名称：

  Spectroscopic study of ceramic precursors obtained by hydrolytic condensation of ethoxycyclotetrasiloxane

  摘要：

  Hydrolytic polycondensation process, also called sol-gel process, leads to formation of xerogels from simple molecules e.g. most widely used tetraethoxysilane (TEOS). In the presented work 2,4,6,8-tetraethoxy-2,4,6,8-tetramethylcyclotetrasiloxane - D-4(OEt)(4) was applied as the molecular precursor. Polycondensation reactions were performed in the presence of Bu4NF or HCl/NH4OH as the catalysts.The obtained xerogels were studied by FT-IR, MAS-NMR and XRD methods. Depending on the condensation process conditions, structure of the resulting materials varied from octahedral cage unit (T-8) through a ladder chain to random structure.Dried xerogels were heated at the temperature of 800 and 1000 degrees C in argon or air atmosphere (pyrolysis or ceramization). In the atmosphere of argon SiCxOy glass materials were obtained, while in air silica glass was formed. Their properties depended on the pyrolysis conditions as well as on the xerogel structure. IR spectroscopy results allowed to conclude about the short range order in amorphous xerogel and glass materials. (c) 2008 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.molstruc.2007.12.037
• 作为产物：
  描述：

  [二氯(乙氧基)甲基]硅烷 在 吡啶 作用下， 生成 (2,4,6,8-tetraethoxy)-2,4,6,8-tetramethylcyclooctatetrasiloxane 、 alkaline earth salt of/the/ methylsulfuric acid
  参考文献：
  名称：

  Alkylalkoxypolysiloxanes. VI. Lower Members of Cyclic Methyl-, and Ethyl-ethoxypolysiloxanes

  摘要：

  1) 使用吡啶作为酸接受体，甲基乙氧基二氯硅烷和乙基乙氧基二氯硅烷的水解速度大大降低；2) 制备了甲基乙氧基环三硅氧烷和乙基乙氧基环三硅氧烷，并对其进行了表征。3）制备了甲基乙氧基环四硅氧烷和乙基乙氧基环四硅氧烷，并对其进行了表征。

  DOI：

  10.1246/bcsj.31.22

文献信息

• Alkylalkoxypolysiloxanes. VI. Lower Members of Cyclic Methyl-, and Ethyl-ethoxypolysiloxanes
  作者：Rokuro Okawara、Gi-ichi Minami、Zensaburo Oku

  DOI：10.1246/bcsj.31.22

  日期：1958.1

  1) Methyl- and ethyl-ethoxydichlorosilane were hydrolyzed with considerable dropping rate using pyridine as an acid acceptor.2) Methyl- and ethyl-ethoxycyclotrisiloxane have been prepared and characterized. The former was found to be an unstable compound.3) Methyl- and ethyl-ethoxycyclotetrasiloxane have been prepared and characterized.4) Some brief data of infrared absorption spectra of those compounds have been presented.

  1) 使用吡啶作为酸接受体，甲基乙氧基二氯硅烷和乙基乙氧基二氯硅烷的水解速度大大降低；2) 制备了甲基乙氧基环三硅氧烷和乙基乙氧基环三硅氧烷，并对其进行了表征。3）制备了甲基乙氧基环四硅氧烷和乙基乙氧基环四硅氧烷，并对其进行了表征。
• Spectroscopic study of ceramic precursors obtained by hydrolytic condensation of ethoxycyclotetrasiloxane
  作者：M. Handke、A. Kowalewska、W. Mozgawa

  DOI：10.1016/j.molstruc.2007.12.037

  日期：2008.9

  Hydrolytic polycondensation process, also called sol-gel process, leads to formation of xerogels from simple molecules e.g. most widely used tetraethoxysilane (TEOS). In the presented work 2,4,6,8-tetraethoxy-2,4,6,8-tetramethylcyclotetrasiloxane - D-4(OEt)(4) was applied as the molecular precursor. Polycondensation reactions were performed in the presence of Bu4NF or HCl/NH4OH as the catalysts.The obtained xerogels were studied by FT-IR, MAS-NMR and XRD methods. Depending on the condensation process conditions, structure of the resulting materials varied from octahedral cage unit (T-8) through a ladder chain to random structure.Dried xerogels were heated at the temperature of 800 and 1000 degrees C in argon or air atmosphere (pyrolysis or ceramization). In the atmosphere of argon SiCxOy glass materials were obtained, while in air silica glass was formed. Their properties depended on the pyrolysis conditions as well as on the xerogel structure. IR spectroscopy results allowed to conclude about the short range order in amorphous xerogel and glass materials. (c) 2008 Elsevier B.V. All rights reserved.