Azido-tetrazolo tautomeric conversions have been investigated by NMR, X-ray and semiempirical calculations in a series of new 7(8)-methylated azolopyridazines. The transannular effects of the triazole- and tetrazole-ring fusion with pyridazine have been compared, and the thermodynamic equilibrium of the 7- to 8-methyl conversions of the 6-azido-7(8)-methyltetrazolopyridazines monitored in the function
已通过 NMR、X 射线和半经验计算在一系列新的 7(8)-甲基化唑并
哒嗪中研究了
叠氮四唑互变异构转化。已经比较了三唑-和
四唑-环与
哒嗪融合的跨环效应,并且在温度的函数中监测了 6-
叠氮基-7(8)-
甲基四唑并
哒嗪的 7- 到 8-甲基转化的热力学平衡
哒嗪氢的 1 H NMR 位移。控制唑并
哒嗪中
叠氮-
四唑转化的一般规则已经制定,并基于分子结构和由其取代基在
哒嗪环中诱导的应变。