3-Methylene-2-tert-butylmethylene-2,3-dihydrofuran | 153625-91-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 杂芳族化合物
• 英文名称: 3-Methylene-2-tert-butylmethylene-2,3-dihydrofuran
• 英文别名: (2Z)-2-(2,2-dimethylpropylidene)-3-methylidenefuran
• CAS: 153625-91-3
• 化学式: C₁₀H₁₄O
• 分子量: 150.221
• InChiKey: NAWVCGJTCRGUPT-CLFYSBASSA-N

物化性质

• 沸点：
  224.4±9.0 °C(predicted)
• 密度：
  0.91±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.9
• 重原子数：
  11
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  9.2
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  3-Methylene-2-tert-butylmethylene-2,3-dihydrofuran 生成 (2'Z)-7-tert-butyl-2'-(2,2-dimethylpropylidene)spiro[5,7-dihydro-4H-1-benzofuran-6,3'-furan]
  参考文献：
  名称：

  Trahanovsky Walter S., Huang Yih-chuan Jason, Leung Man-kit, J. Org. Chem, 59 (1994) N 9, S 2594-2598

  摘要：

  DOI：
• 作为产物：
  描述：

  3,3-二甲基丁酰氯 在 吡啶 、 lithium aluminium tetrahydride 、 lithium cyclohexylisopropylamide 、 三乙胺 作用下， 以 乙醚 为溶剂， 生成 3-Methylene-2-tert-butylmethylene-2,3-dihydrofuran
  参考文献：
  名称：

  Effects of .alpha.-tert-butyl group substitution on the reactivity and dimerization products of furan-based o-quinodimethanes

  摘要：

  Flash vacuum pyrolysis (FVP) of 2-neopentyl-3-furylmethyl benzoate (8) produces 3-methylene-2-(tert-butylmethylene)-2,3-dihydrofuran (5), the major product as shown by low-temperature H-1 NMR spectroscopy. Upon warming to room temperature, 5 dimerizes giving mostly two stereoisomeric [4 + 2] dimers 11a and 11b in addition to a small amount of the [4 + 4] dimer 12. FVP of a mixture of the two [4 + 2] dimers 11a and 11b gives the thermodynamically more stable [4 + 4] dimer 12. The rate constants for the dimerization of 5 in solution at temperatures from -29 to +5 OC were determined by H-1 NMR spectroscopy The rate constants and activation parameters (Delta H-double dagger = 10.8 kcal/mol, Delta S-double dagger = -28.8 eu) are very similar to those reported for the unsubstituted furan-based o-quinodimethane. FVP of (2-methyl-3-furyl)(tert-butyl)methyl benzoate (13) and (2-neopentyl-3-furyl)(tert-butyl)methyl benzoate (18) give as the major product, 2-methylene-3-(tert-butylmethylene)-2,3-dihydrofuran (6) and 2,3-bis(tert-butylmethylene)-2,3-dihydro (7), respectively. Compounds 6 and 7, in contrast to 5, are stable at room temperature apparently because for each of these compounds a bulky tert-butyl group is on the more reactive methylene, the S-methylene. These results offer further support for the mechanism for the dimerization of furan-based o-quinodimethanes which proceeds in two steps via a transient diradical intermediate.

  DOI：

  10.1021/jo00088a050