作者:Per H. J. Carlsen、Kåre B. Jørgensen
DOI:10.1002/jhet.5570340315
日期:1997.5
A number of 4-allylic substituted 3,5-diphenyl-4H-1,2,4-triazoles were thermolyzed at 315–320° in evacuated glass ampoules. The main reaction in the melt was rearrangement to the corresponding 1-substituted triazoles, which appeared to proceed via competing SN2 and SN2′ mechanisms. The allylic systems were observed to undergo [2,3]-allyl walk reactions between the 1- and 2-ring positions. Allyl to
在真空玻璃安瓿瓶中,许多4-烯丙基取代的3,5-二苯基-4 H -1,2,4-三唑在315–320°下热解。熔体中的主要反应是重排为相应的1取代的三唑,这似乎是通过竞争S N 2和S N进行的。2′机制。观察到该烯丙基体系在1-和2-环位置之间经历[2,3]-烯丙基步移反应。烯丙基向乙烯基的异构化也发生了。烯丙基部分的取代增加了反应速率,但降低了烯丙基向乙烯基取代的三唑的异构化速率。在反应条件下,4-乙烯基取代的三唑是惰性的。一些三唑被转化为取代的吡啶。提出这是通过氮挤出和形成1,3-偶极中间体(腈基内酯)进行的,该中间体分子内添加到烯丙基部分中,然后芳构化到吡啶上。