Thermal Rearrangement of 4-Alkyl-4H-1,2,4-triazoles to 1-Alkyl-1H-1,2,4-triazoles − A Study of the Mechanism by Cross-over Experiments
作者:Odd R. Gautun、Per H. J. Carlsen
DOI:10.1002/1099-0690(200011)2000:22<3745::aid-ejoc3745>3.0.co;2-k
日期:2000.11
The mechanism for the thermal rearrangement of 4-alkyl-1,2,4-triazoles to the corresponding 1-alkyl-1,2,4-triazoles, was studied by cross-over experiments with mixtures of 4-ethyl-3,5-diphenyl-4H-1,2,4-triazole and 3,5-bis(4-methylphenyl)-4-propyl-4H-1,2,4-triazole. This gave support to a proposed mechanism involving the formation of an ionic triazolium triazolate intermediate, and a subsequent nucleophilic
4-烷基-1,2,4-三唑类热重排为相应的1-烷基-1,2,4-三唑类的机理,通过使用4-乙基-3,5-三唑的混合物进行交叉实验研究-二苯基-4H-1,2,4-三唑和3,5-双(4-甲基苯基)-4-丙基-4H-1,2,4-三唑。这支持了所提出的机制,该机制涉及形成离子三唑鎓三唑盐中间体,随后三唑盐阴离子在 1- 和 4- 烷基位置进行亲核攻击以形成观察到的产物。通过1-乙基-3,5-双(4-甲基苯基)-4-丙基-1,2,4-三唑鎓四氟硼酸盐和3,5-二苯基-1H-三唑酸钾的混合物的热解获得进一步的载体。