2-isopropylpenta-1,4-diene | 760-75-8

• 分子结构分类: 有机化合物 - 碳氢化合物 - 不饱和烃
• 英文名称: 2-isopropylpenta-1,4-diene
• 英文别名: 2-Isopropyl-1,4-pentadiene；2-Isopropyl-1,4-pentadien；2-Isopropyl-penta-1,4-dien；5-Methyl-4-methylidenehex-1-ene
• CAS: 760-75-8
• 化学式: C₈H₁₄
• 分子量: 110.199
• InChiKey: TVYPKPSWMKVIOU-UHFFFAOYSA-N

物化性质

• 沸点：
  111.1±10.0 °C(Predicted)
• 密度：
  0.730±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.5
• 重原子数：
  8
• 可旋转键数：
  3
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.5
• 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：

  三甲基氯硅烷 、 2-isopropylpenta-1,4-diene 在 正丁基锂 作用下， 生成 trimethyl-[(2Z)-2-propan-2-ylpenta-2,4-dienyl]silane 、 trimethyl-[(Z)-5-methyl-4-methylidenehex-2-enyl]silane 、 trimethyl-[(E)-5-methyl-4-methylidenehex-2-enyl]silane
  参考文献：
  名称：

  Highly selective trapping of unsymmetrical pentadienyl anions by silicon and tin electrophiles. Marked contrast between kinetic and thermodynamic control of product composition

  摘要：

  The nucleophilic reaction of lithium and potassium salts of five pentadienyl anions bearing sterically and/or coordinatively different groups at their unsymmetrical 2-position toward Me3SiCl and Me3SnBr is described. When the anion of the potassium salt was trapped by Me3SiCl, (Z)-4-substituted-pentadienylsilanes were obtained with high selectivity (87-100%). The lithium salt, however, gave a mixture of (E)- and (Z)-4-substituted-pentadienylsilanes. The coupling reaction proceeds under kinetic control, because the product composition from Si trapping reflected the structure of the parent dienyl anion and the steric interaction between the incoming Me3Si group and the substituent on the anion. In contrast, when the anion was trapped by Me3SnBr under the identical conditions, (Z)-2-substituted-pentadienyltins were formed with 60-96% selectivity. Only relatively small changes in product composition, as a function of the cation or the substituent on the anion, were observed. These results could be explained by thermodynamic controlling factors, including a 1,5-Me3Sn shift, and a redistribution of pentadienyl groups under basic conditions.

  DOI：

  10.1021/jo00006a011
• 作为产物：
  描述：

  异戊酸甲酯 在 吡啶 、 lithium aluminium tetrahydride 、 1,8-二氮杂双环[5.4.0]十一碳-7-烯 、 sodium iodide 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 氯仿 为溶剂， 生成 2-isopropylpenta-1,4-diene
  参考文献：
  名称：

  Highly selective trapping of unsymmetrical pentadienyl anions by silicon and tin electrophiles. Marked contrast between kinetic and thermodynamic control of product composition

  摘要：

  The nucleophilic reaction of lithium and potassium salts of five pentadienyl anions bearing sterically and/or coordinatively different groups at their unsymmetrical 2-position toward Me3SiCl and Me3SnBr is described. When the anion of the potassium salt was trapped by Me3SiCl, (Z)-4-substituted-pentadienylsilanes were obtained with high selectivity (87-100%). The lithium salt, however, gave a mixture of (E)- and (Z)-4-substituted-pentadienylsilanes. The coupling reaction proceeds under kinetic control, because the product composition from Si trapping reflected the structure of the parent dienyl anion and the steric interaction between the incoming Me3Si group and the substituent on the anion. In contrast, when the anion was trapped by Me3SnBr under the identical conditions, (Z)-2-substituted-pentadienyltins were formed with 60-96% selectivity. Only relatively small changes in product composition, as a function of the cation or the substituent on the anion, were observed. These results could be explained by thermodynamic controlling factors, including a 1,5-Me3Sn shift, and a redistribution of pentadienyl groups under basic conditions.

  DOI：

  10.1021/jo00006a011

文献信息

• Untersuchungen über Allylgruppenwanderungen in aliphatischen Carbenium-Ionen
  作者：Zuva Dillenberger、Hans Schmid、Hans-Jüren Hansen

  DOI：10.1002/hlca.19780610531

  日期：1978.7.12

  Investigations on the Migratory Aptitude of Allyl Groups in Aliphatic Carbenium-Ions

  脂肪族碳负离子中烯丙基的迁移能力研究
• Synthesis of 1,4-Diolefins¹
  作者：N. F. Cywinski

  DOI：10.1021/jo01013a012

  日期：1965.2
• Direct one-pot synthesis of terminal olefins and deuterio olefins from carboxylic acid chlorides
  作者：Jose Barluenga、Miguel Yus、Jose M. Concellon、Pablo Bernad

  DOI：10.1021/jo00166a041

  日期：1983.9
• Curry, Michael J.; Stevens, D.R., Journal of the Chemical Society. Perkin transactions I, 1980, p. 1756 - 1760
  作者：Curry, Michael J.、Stevens, D.R.

  DOI：——

  日期：——
• CURRY M. J.; STEVENS I. D. R., J. CHEM. SOC. PERKIN TRANS., 1980, PART 1, NO 8, 1756-1760
  作者：CURRY M. J.、 STEVENS I. D. R.

  DOI：——

  日期：——