2,2,4,4,6,6-六甲基-8,8-二乙烯基环四硅氧烷 | 433725-45-2

• 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
• 中文名称: 2,2,4,4,6,6-六甲基-8,8-二乙烯基环四硅氧烷
• 英文名称: 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane
• 英文别名: 2,2-Diethenyl-4,4,6,6,8,8-hexamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocane；2,2-bis(ethenyl)-4,4,6,6,8,8-hexamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
• CAS: 433725-45-2
• 化学式: C₁₀H₂₄O₄Si₄
• 分子量: 320.64
• InChiKey: JCPAUZNZVFBPMD-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.06
• 重原子数：
  18
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.6
• 拓扑面积：
  36.9
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  1,1,3,3,5,5-六甲基三硅氧烷 在 palladium on activated charcoal 水 、 三乙胺 作用下， 以 四氢呋喃 、 乙醚 为溶剂， 反应 3.0h， 生成 2,2,4,4,6,6-六甲基-8,8-二乙烯基环四硅氧烷
  参考文献：
  名称：

  Anionic and Cationic Ring-Opening Polymerization of 2,2,4,4,6,6-Hexamethyl-8,8-divinylcyclotetrasiloxane

  摘要：

  Ring-opening polymerization (ROP) of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane (I) initiated by both 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2lambda(5),4lambda(5)-catenadi(phosphazene) (C22H63N13P4, P-4-t-Bu superbase) and trifluoromethanesulfonic acid (CF3SO3H, triflic acid) has been studied. Both reactions lead to mixtures of linear copolymer, low molecular weight co-oligomers and monomeric cyclosiloxanes. The composition, molecular weight distribution, microstructure, and thermal properties of the copolymers have been determined. The copolymer microstructure has been determined by Si-29 NMR spectroscopy. Monomeric cyclosiloxanes have been identified by GC/MS. Both copolymer microstructure and cyclosiloxanes formed depend on the particular catalyst system utilized. P-4-t-Bu superbase-initiated anionic ROP of I leads to a copolymer with a random microstructure and to a series of monomeric cyclotetra-, cyclopenta-, and cyclohexasiloxanes formed by random combination of dimethylsiloxane (D) and divinylsiloxane (V) units. On the other hand, triflic acid-initiated ROP of I occurs in a chemoselective manner. This leads to a copolymer with a more ordered microstructure. In this case, I is the only monomeric cyclosiloxane found.

  DOI：

  10.1021/ma030162q

文献信息

• Anionic and Cationic Ring-Opening Polymerization of 2,2,4,4,6,6-Hexamethyl-8,8-divinylcyclotetrasiloxane
  作者：Conan J. Teng、William P. Weber、Guoping Cai

  DOI：10.1021/ma030162q

  日期：2003.7.1

  Ring-opening polymerization (ROP) of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane (I) initiated by both 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2lambda(5),4lambda(5)-catenadi(phosphazene) (C22H63N13P4, P-4-t-Bu superbase) and trifluoromethanesulfonic acid (CF3SO3H, triflic acid) has been studied. Both reactions lead to mixtures of linear copolymer, low molecular weight co-oligomers and monomeric cyclosiloxanes. The composition, molecular weight distribution, microstructure, and thermal properties of the copolymers have been determined. The copolymer microstructure has been determined by Si-29 NMR spectroscopy. Monomeric cyclosiloxanes have been identified by GC/MS. Both copolymer microstructure and cyclosiloxanes formed depend on the particular catalyst system utilized. P-4-t-Bu superbase-initiated anionic ROP of I leads to a copolymer with a random microstructure and to a series of monomeric cyclotetra-, cyclopenta-, and cyclohexasiloxanes formed by random combination of dimethylsiloxane (D) and divinylsiloxane (V) units. On the other hand, triflic acid-initiated ROP of I occurs in a chemoselective manner. This leads to a copolymer with a more ordered microstructure. In this case, I is the only monomeric cyclosiloxane found.