20-bromo-eicos-1-ene | 811794-49-7

• 分子结构分类: 有机化合物 - 有机卤素化合物 - 有机溴化物
• 英文名称: 20-bromo-eicos-1-ene
• 英文别名: 20-bromoicos-1-ene
• CAS: 811794-49-7
• 化学式: C₂₀H₃₉Br
• 分子量: 359.434
• InChiKey: GSULUXYLSJTTAF-UHFFFAOYSA-N

物化性质

• 沸点：
  399.6±11.0 °C(Predicted)
• 密度：
  0.979±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  10.4
• 重原子数：
  21
• 可旋转键数：
  18
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.9
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  20-bromo-eicos-1-ene 在 sodium hydroxide 、 偶氮二异丁腈 、 四丁基硫酸氢铵 作用下， 以 四氢呋喃 为溶剂， 反应 84.0h， 生成 hexa(ethylene glycol)icos-20-yl(thioacetate)
  参考文献：
  名称：

  Preparation of Oligo(ethylene glycol)-Terminated Icosanedisulfides

  摘要：

  本文描述了六聚乙二醇和羧甲基六聚乙二醇终止的烷基二硫化物4和7的合成，其中烷基链长达二十个亚甲基。关键的二十碳合成单元20-溴二十烯（1）是通过8-溴辛-1-烯的同系物化反应制备的，该反应是通过Cu(II)催化的对应格氏试剂与1,12-二溴十二烷的偶合反应实现的。预计化合物4和7将生成自组装单层（SAMs），其稳定性和有序程度均优于传统的十烷同系物形成的单层。

  DOI：

  10.1055/s-2006-926377
• 作为产物：
  描述：

  10-十一烯-1-醇 在 Grubbs catalyst first generation 、 Wilkinson's catalyst 、 四溴化碳 、 potassium tert-butylate 、 氢气 、 三苯基膦 作用下， 以 四氢呋喃 、 二氯甲烷 、 甲苯 为溶剂， 55.0 ℃ 、6.21 MPa 条件下， 生成 20-bromo-eicos-1-ene
  参考文献：
  名称：

  Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology

  摘要：

  Synthesis and morphological characterization are reported for a series of 13 precision branched polyethylene structures, the branch being placed on every 39th carbon and varying in size from methyl to pentadecyl group. A recently established synthetic scheme for preparation of the symmetrical alpha,omega-diene monomer was employed to increase the number of methylene carbons between the branch points from 20 to 38, yielding polymers with 5.26 mol % alpha-olefin incorporation. The morphology of these polymers was investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAX])), and transmission electron microscopy (TEM). Methyl branching significantly reduces the melting point and single crystal lamellae thickness of unbranched polyethylene. On the other hand, all further branches from ethyl to pentadecyl produce polymers that have similar melting points and single crystal lamellae thicknesses. A dear change in the morphology of both solution and melt-grown crystals of these polymers was observed from a situation where the methyl branch is incorporated in the polymer's unit cell to one where branches of greater mass are mostly expelled from the unit cell.

  DOI：

  10.1021/ma3002577

文献信息

• High polymer, ferro-electric liquid-crystalline composition containing the high polymer and raw material of the high polymer
  申请人：IDEMITSU KOSAN COMPANY LIMITED

  公开号：EP0578135A2

  公开（公告）日：1994-01-12

  This invention provides a high polymer having the following repeating unit (I), a diene compound which is represented by the following formula (II) and is a raw material of the high polymer: and a ferroelectric liquid-crystalline composition containing the high polymer and a low molecular weight smectic liquid-crystalline compound. The ferroelectric liquid-crystalline composition is easy to orient and exhibits a fast response against applied electric field.

  本发明提供了一种具有以下重复单元（I）的高聚物，一种由下式（II）表示的二烯化合物，它是高聚物的原料： 以及一种铁电液晶组合物，该组合物含有该高聚物和一种低分子量 smectic 液晶化合物。铁电液晶组合物易于定向，对外加电场的反应速度快。
• Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Pushing the Limits toward Longer Run Lengths
  作者：Bora Inci、Kenneth B. Wagener

  DOI：10.1021/ja2040046

  日期：2011.8.10

  A symmetrical alpha,omega-diene monomer with a 36 methylene run length was synthesized and polymerized, and the unsaturated polymer was hydrogenated to generate precision polyethylene possessing a butyl branch on every 75th carbon (74 methylenes between branch points). The precision polymer sharply melts at 104 degrees C and exhibits the typical orthorhombic unit cell structure with two characteristic wide-angle X-ray diffraction (WAXD) crystalline peaks observed at 21.5 degrees and 24.0 degrees, corresponding to reflection planes (110) and (200), respectively.
• The facile preparation of alkenyl metathesis synthons
  作者：Travis W. Baughman、John C. Sworen、Kenneth B. Wagener

  DOI：10.1016/j.tet.2004.09.021

  日期：2004.11

  We report synthetic methodology allowing the preparation of any length alkenyl halide from inexpensive starting reagents. Standard organic transformations were used to prepare straight chain alpha-olefin halides in excellent overall yields with no detectable olefin isomerization and full recovery of any unreacted starting material. Reported transformations can be used for the selective incorporation of pure a-olefin metathesis sites in highly functionalized molecules. (C) 2004 Elsevier Ltd. All rights reserved.
• US5350538A
  申请人：——

  公开号：US5350538A

  公开（公告）日：1994-09-27
• Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology
  作者：Bora Inci、Ingo Lieberwirth、Werner Steffen、Markus Mezger、Robert Graf、Katharina Landfester、Kenneth B. Wagener

  DOI：10.1021/ma3002577

  日期：2012.4.24

  Synthesis and morphological characterization are reported for a series of 13 precision branched polyethylene structures, the branch being placed on every 39th carbon and varying in size from methyl to pentadecyl group. A recently established synthetic scheme for preparation of the symmetrical alpha,omega-diene monomer was employed to increase the number of methylene carbons between the branch points from 20 to 38, yielding polymers with 5.26 mol % alpha-olefin incorporation. The morphology of these polymers was investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAX])), and transmission electron microscopy (TEM). Methyl branching significantly reduces the melting point and single crystal lamellae thickness of unbranched polyethylene. On the other hand, all further branches from ethyl to pentadecyl produce polymers that have similar melting points and single crystal lamellae thicknesses. A dear change in the morphology of both solution and melt-grown crystals of these polymers was observed from a situation where the methyl branch is incorporated in the polymer's unit cell to one where branches of greater mass are mostly expelled from the unit cell.