1,2,4-trimethyl-5-[(2-methylphenyl)ethynyl]benzene | 1191900-12-5

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 1,2,4-trimethyl-5-[(2-methylphenyl)ethynyl]benzene
• CAS: 1191900-12-5
• 化学式: C₁₈H₁₈
• 分子量: 234.341
• InChiKey: IWYKSJZZGDXJRM-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.32
• 重原子数：
  18.0
• 可旋转键数：
  0.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.22
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为产物：
  描述：

  2-溴甲苯 、 1-乙炔基-2,4,5-三甲基苯 在 potassium phosphate 、 C₂₈H₄₇ClN₄P₂Pd 作用下， 以 1,4-二氧六环 、 乙二醇 为溶剂， 反应 3.0h， 生成 1,2,4-trimethyl-5-[(2-methylphenyl)ethynyl]benzene
  参考文献：
  名称：

  在无添加剂和无胺的条件下进行的基于氨基膦基钯的钳形配合物促进的高度便捷，清洁，快速和可靠的Sonogashira偶联反应

  摘要：

  Abstractmagnified imageSequential addition of 1,1′,1′′‐phosphinetriyltripiperidine and 1,3‐diaminobenzene or resorcinol to toluene solutions of (cyclooctadiene)palladium dichloride [Pd(cod)(Cl)2] under nitrogen in “one pot” almost quantitatively yielded the aminophosphine‐based pincer complexes {[C6H3‐2,6‐(XP{piperidinyl}2)2]Pd(Cl)} (X=NH 1; X=O 2). Complex 1 (and to a minor extent 2) proved to be efficient Sonogashira catalysts, which allow the quantitative coupling of various electronically deactivated and/or sterically hindered and functionalized aryl iodides and aryl bromides with several alkynes as coupling partners within very short reaction times and low catalyst loadings. Importantly, in contrast to most of the Sonogashira catalysts, which either are both air‐ and moisture‐sensitive and/or require the addition of co‐catalysts, such as copper(I) iodide [CuI], for example, or a large excess of an amine, the coupling reactions were carried out without the use of amines, co‐catalysts or other aditives and without exclusion of air and moisture. Moreover, the desired products were exclusively formed (no side‐products were detected) without employing an excess of one of the substrates. Ethylene glycol and potassium phosphate (K3PO4) were found to be the ideal solvent and base for this transformation. Experimental observations strongly indicate that palladium nanoparticles are not the catalytically active form of 1 and 2. On the other hand, their transformation into another homogeneous catalytically active species cannot be excluded.

  DOI：

  10.1002/adsc.200900112