1-ethyl-3-methylimidazolium methoxide | 366491-16-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 1-ethyl-3-methylimidazolium methoxide
• 英文别名: 1-ethyl-3-methylimidazol-3-ium;methanolate
• CAS: 366491-16-9
• 化学式: CH₃O*C₆H₁₁N₂
• 分子量: 142.201
• InChiKey: QJIHFHDCWHOKKE-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.69
• 重原子数：
  10
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.57
• 拓扑面积：
  31.9
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为产物：
  描述：

  氯化 1-乙基-3-甲基咪唑 以 甲醇 、 氘代丙酮 为溶剂， 以85%的产率得到1-ethyl-3-methylimidazolium methoxide
  参考文献：
  名称：

  Imidazole carbenes

  摘要：

  描述了一种制备式(I)的咪唑卤代物的过程，其中R1和R2可以相同也可以不同，是氢或线性或支链烃基团，包括将咪唑卤化物与强碱在减压条件下加热并分离产物的过程。还描述了一种制备这些咪唑卤代物盐的过程，以及它们作为离子液体的用途。

  公开号：

  US20030186803A1

文献信息

• METHOD FOR PREPARING DIMETHYL CARBONATE
  申请人：Shenyang University of Chemical Technology

  公开号：EP3950660A1

  公开（公告）日：2022-02-09

  The present disclosure discloses a method for preparing dimethyl carbonate, comprising the following steps: contacting a raw material comprising ethylene carbonate and methanol with a catalyst to produce the dimethyl carbonate; wherein the catalyst comprises an ionic liquid with an anion and a cation, and the cation has a structure represented by Formula I or Formula II. In the method for preparing dimethyl carbonate, a series of ionic liquids with strong alkalinity is developed and used in the transesterification reaction of ethylene carbonate and methanol to synthesize dimethyl carbonate and ethylene glycol. The ionic liquids exhibit extremely high reactivity. A reaction equilibrium is reached when the reaction is carried out at a temperature ranging from 68°C to70°C for 5 min even with 0.3 wt% catalyst, and the catalyst still exhibits certain catalytic activity even at 0°C.

  本发明公开了一种制备碳酸二甲酯的方法，包括以下步骤：将由碳酸乙烯酯和甲醇组成的原料与催化剂接触，制得碳酸二甲酯；其中催化剂包括带有阴离子和阳离子的离子液体，阳离子具有由式I或式II表示的结构。在制备碳酸二甲酯的方法中，开发了一系列具有强碱性的离子液体，并将其用于碳酸乙烯酯和甲醇的酯交换反应，以合成碳酸二甲酯和乙二醇。离子液体表现出极高的反应活性。即使使用 0.3 wt%的催化剂，当反应在 68°C 至 70°C 的温度下进行 5 分钟时，也能达到反应平衡。
• HOMOGENEOUS CATALYST AND HETEROGENEOUS CATALYST BASED ON IONIC LIQUID, AND PREPARATION METHOD THEREFOR AND USE THEREOF
  申请人：Shenyang University of Chemical Technology

  公开号：EP3950123A1

  公开（公告）日：2022-02-09

  The present disclosure discloses a homogeneous catalyst comprising an ionic liquid with an anion and a cation, wherein the anion and the cation both comprises a nitrogen-containing heterocycle, wherein the cation has a structure represented by Formula I or Formula II, and the anion has a structure represented by Formula III, Formula IV or Formula V. The present disclosure further provides a heterogeneous catalyst comprising the homogeneous catalyst, a preparation method and use of the homogeneous catalyst and the heterogeneous catalyst. The homogeneous catalyst and heterogeneous catalyst are used to synthesize high-purity ethyl methyl carbonate product by the transesterification of dimethyl carbonate and ethanol, transesterification of dimethyl carbonate and diethyl carbonate, or transesterification of methanol and diethyl carbonate, and exhibit high reaction activity wherein a reaction equilibrium can be reached when the reaction time is 5 min and the reaction temperature is in a range from 76°C to 78°C, and the both catalysts show high catalytic activity even at near room temperature 30°C. The synthesized ionic liquids exhibit substantially unchanged catalytic activity and show higher stability, even after reused 20 times.

  本发明公开了一种均相催化剂，该催化剂由带有阴离子和阳离子的离子液体组成，其中阴离子和阳离子均由含氮杂环组成，阳离子具有式I或式II表示的结构，阴离子具有式III、式IV或式V表示的结构。本发明进一步提供了一种包含该均相催化剂的异相催化剂、该均相催化剂和该异相催化剂的制备方法和用途。均相催化剂和异相催化剂用于通过碳酸二甲酯和乙醇的酯交换反应、碳酸二甲酯和碳酸二乙酯的酯交换反应或甲醇和碳酸二乙酯的酯交换反应合成高纯度的碳酸甲乙酯产品，并表现出较高的反应活性，其中当反应时间为 5 分钟，反应温度在 76°C 至 78°C 范围内时，可达到反应平衡，即使在接近室温 30°C 时，两种催化剂也表现出较高的催化活性。合成的离子液体的催化活性基本不变，即使重复使用 20 次，也能表现出较高的稳定性。
• The Effect of Alkoxide Ionic Liquids on the Synthesis of Dimethyl Carbonate from CO2 and Methanol over ZrO2–MgO
  作者：Valerie Eta、Päivi Mäki-Arvela、Eero Salminen、Tapio Salmi、Dmitry Yu. Murzin、Jyri-Pekka Mikkola

  DOI：10.1007/s10562-011-0666-3

  日期：2011.9

  The use of carbon dioxide in the synthesis of chemicals, such as dimethyl carbonate (DMC), constitutes an environmentally attractive alternative to hazardous and toxic reagents. However, the direct synthesis of DMC from methanol and CO2 is characterized by low yields due to the reaction equilibrium and the thermodynamic limitations (Delta G(298K)(0) = + 26.3 kj/mol). Alkoxide ionic liquids possessing alkylimidazolium and benzalkonium cations were prepared, characterised and tested together with ZrO2-MgO catalyst for the synthesis of DMC from methanol and CO2. By using the novel ionic liquid as additives, ca. 12% conversion of methanol, and 90% selectivity to DMC was obtained at 120 A degrees C and 7.5 MPa. The water abstracting potential of the ionic liquids influenced the conversion of methanol and the selectivity to DMC. The alkoxide ionic liquids were recovered and reused in DMC synthesis without loss in activity and selectivity.
• IMIDAZOLE CARBENES
  申请人：The Queen's University of Belfast

  公开号：EP1268440A1

  公开（公告）日：2003-01-02
• US6939974B2
  申请人：——

  公开号：US6939974B2

  公开（公告）日：2005-09-06