2,5-Dicyano-1,3,4-thiadiazol | 52938-14-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 2,5-Dicyano-1,3,4-thiadiazol
• 英文别名: 1,3,4-thiadiazole-2,5-dicarbonitrile；1,3,4-Thiadiazole-2,5-dicarbonitrile
• CAS: 52938-14-4
• 化学式: C₄N₄S
• 分子量: 136.137
• InChiKey: MNXNZGROYKRMGX-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.5
• 重原子数：
  9
• 可旋转键数：
  0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  102
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为产物：
  描述：

  1,2-bis(4-chloro-5H-1,2,3-dithiazol-5-ylidene)hydrazine 在 polymer bound triphenylphosphine 作用下， 以 二氯甲烷 为溶剂， 反应 0.5h， 以69%的产率得到2,5-Dicyano-1,3,4-thiadiazol
  参考文献：
  名称：

  The preparation of dicyano-1,3,4-thiadiazole and tricyanothiazole via 1,2,3-dithiazole chemistry

  摘要：

  Treatment of 1,2-bis(4-chloro-5H-1,2,3-dithiazol-5-ylidene)hydrazine 4 with benzyltriethylaminonium iodide (1 equiv) affords dicyano-1,3,4-thiadiazole 3 and 5-cyano-1,3,4-thiadiazole-2-carboxamide 5 in 79 and 21% yields, respectively. By using polymer bound triphenylphosphine instead of benzyltriethylammonium iodide the dicyano-1,3,4-thiadiazole 3 can be isolated in 70% yield without chromatography. The reaction of DAMN with Appel salt 8 gave 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)-2-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)acetonitrile 7 (14%), 2,3-bis-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)fumaronitrile 10 (14%), and 2,3-bis(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)maleonitrile 11 (24%) together with other products. The maleonitrile 11 isomerizes into the fumaronitrile 10 on irradiation at 365 nm. Reaction of aminoacetonitrile with Appel salt 8 gives the (dithiazolylidene)acetonitrile 7 in 33% yield. Treatment of (dithiazolylidene)acetonitrile 7 with polymer bound triphenylphosphine gives tricyanothiazole 6 in 76% yield. A rational general mechanism for the transformation of bisdithiazoles to percyanoheteroles is proposed. (C) 2009 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2009.10.003