3-乙基-5-甲基-2-乙烯基吡嗪 | 181589-32-2

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二嗪类
• 中文名称: 3-乙基-5-甲基-2-乙烯基吡嗪
• 英文名称: 2-ethenyl-3-ethyl-5-methylpyrazine
• 英文别名: 2-vinyl-3-ethyl-5-methylpyrazine
• CAS: 181589-32-2
• 化学式: C₉H₁₂N₂
• mdl: MFCD09753547
• 分子量: 148.208
• InChiKey: YSQNQOKRWIKETP-UHFFFAOYSA-N

物化性质

• 沸点：
  202.4±35.0 °C(Predicted)
• 密度：
  0.981±0.06 g/cm3(Predicted)
• 溶解度：
  可溶于氯仿（少许）、乙酸乙酯（少许）、甲醇（少许）
• LogP：
  2.538 (est)
• 保留指数：
  1172

计算性质

• 辛醇/水分配系数(LogP)：
  1.9
• 重原子数：
  11
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.333
• 拓扑面积：
  25.8
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  2,3-二乙基-5-甲基吡嗪 在 N-溴代丁二酰亚胺(NBS) 、 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile 、 二环己胺 作用下， 以 四氯化碳 为溶剂， 反应 1.08h， 生成 3-乙基-5-甲基-2-乙烯基吡嗪
  参考文献：
  名称：

  Detection of Odor-Active Ethenylalkylpyrazines in Roasted Coffee

  摘要：

  In roasted Robusta coffee, two potent earthy smelling compounds were identified as 2-ethenyl-3,5-dimethylpyrazine and 2-ethenyl-3-ethyl-5-methylpyrazine by comparison of gas chromatography and mass spectrometry data with those of the corresponding reference substances. The odor threshold values (0.014 ng/L, air) of the new pyrazines were as low as those of 2-ethyl-3,5-dimethyl-and 2,3-diethyl-5-methylpyrazine. 3-Ethenyl-2-ethyl-5-methylpyrazine was also detected in coffee, and its odor threshold value was 8000 times higher than that of the 2-ethenyl-3-ethyl-5-methylpyrazine. After addition of HBr, the two ethenylethylmethylpyrazine. isomers were separated by capillary gas chromatography. The results indicate the presence of the two isomers in a 1:1 ratio in coffee.

  DOI：

  10.1021/jf9600824

文献信息

• Arabinogalactan isolate from green and roasted coffee for food and delivery applications and process for its production
  申请人：NESTEC S.A.

  公开号：EP1600461A1

  公开（公告）日：2005-11-30

  The present invention refers to a process for extracting arabinogalactans from coffee comprising enzymatically hydrolysing whole or ground green or roasted coffee beans thereby obtaining an aqueous dispersion comprising partially hydrolysed coffee beans and arabinogalactans. Furthermore, the invention also encompasses products where the coffee derived arabinogalactans are used such as a glassy matix, pure soluble coffee and a beverage composition.

  本发明涉及一种从咖啡中提取阿拉伯半乳聚糖的工艺，该工艺包括对整粒或磨碎的绿咖啡豆或烘焙咖啡豆进行酶水解，从而获得一种包含部分水解咖啡豆和阿拉伯半乳聚糖的水分散液。此外，本发明还包括使用从咖啡中提取的阿拉伯半乳聚糖的产品，如玻璃毡、纯可溶咖啡和饮料组合物。
• Inert, glassy matrices for the stabilization of aroma in soluble coffee
  申请人：NESTEC S.A.

  公开号：EP1632135A1

  公开（公告）日：2006-03-08

  A glassy matrix for coffee aroma is provided in which the level of compounds which degrade aroma has been reduced, enabling the production of improved soluble coffee powder.

  提供了一种用于咖啡香味的玻璃基质，其中可降低香味的化合物含量，从而能够生产出更好的可溶性咖啡粉。
• GLASSY MATRICES FOR THE STABILIZATION OF COFFEE AROMA
  申请人：NESTEC S.A.

  公开号：EP1811856A1

  公开（公告）日：2007-08-01
• Arabinogalactan Isolate From Coffee
  申请人：Curti Gisele Delphine

  公开号：US20070248731A1

  公开（公告）日：2007-10-25

  The present invention refers to a process for extracting arabinogalactans from coffee comprising enzymatically hydrolysing whole or ground green or roasted coffee beans thereby obtaining an aqueous dispersion comprising partially hydrolysed coffee beans and arabinogalactans. Furthermore, the invention also encompasses products where the coffee derived arabinogalactans are used such as a glassy matix, pure soluble coffee and a beverage composition.
• Glassy Matrices for the Stabilzation of Coffee Aroma
  申请人：Gretsch Catherine

  公开号：US20080038421A1

  公开（公告）日：2008-02-14

  A glassy matrix for coffee aroma is provided in which the level of compounds which degrade aroma has been reduced, enabling the production of improved soluble coffee powder.