1,20-dibromoeicos-10-ene | 811794-45-3

• 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: 1,20-dibromoeicos-10-ene
• 英文别名: 1,20-Dibromoicos-10-ene
• CAS: 811794-45-3
• 化学式: C₂₀H₃₈Br₂
• 分子量: 438.33
• InChiKey: GAXJLJJKWSFRBB-UHFFFAOYSA-N

物化性质

• 沸点：
  448.2±18.0 °C(Predicted)
• 密度：
  1.157±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  8.57
• 重原子数：
  22.0
• 可旋转键数：
  18.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.9
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为反应物：
  描述：

  1,20-dibromoeicos-10-ene 在 Wilkinson's catalyst 、 potassium tert-butylate 、 氢气 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 甲苯 为溶剂， 55.0 ℃ 、6.21 MPa 条件下， 生成
  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
• 作为产物：
  描述：

  10-十一烯-1-醇 在 Grubbs catalyst first generation 、 四溴化碳 、 三苯基膦 作用下， 以 二氯甲烷 为溶剂， 45.0 ℃ 、1.01 kPa 条件下， 生成 1,20-dibromoeicos-10-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

• On-Nanoparticle Gating Units Render an Ordinary Catalyst Substrate- and Site-Selective
  作者：Minju Kim、Miroslaw Dygas、Yaroslav I. Sobolev、Wiktor Beker、Qiang Zhuang、Tomasz Klucznik、Guillermo Ahumada、Juan Carlos Ahumada、Bartosz A. Grzybowski

  DOI：10.1021/jacs.0c09408

  日期：2021.2.3
• 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.