Thermal decomposition of N-substituted hepta(methoxycarbonyl)-3a,7a-dihydroindazoles proceeds through the elimination of hexamethyl benzenehexacarboxylate and results in the generation of l-aryl-3-methoxycarbonylnitrile imines, which are intercepted by both the electron-withdrawing and electron-releasing olefins, for example, methyl acrylate, cyclopentene, vinylcyclopropane, or ethyl vinyl ether, to form the corresponding pyrazolines and pyrazoles. In the presence of propan-2-ol, the main process proceeds through the addition of nitrile inline to the O—H bond to form methyl 2-isopropoxy-2-[2-(4-methoxyphenyl)hydrazono]acetate.
N-取代氮杂苯并[3a,7a]二氢
吲唑的热分解通过消除
六甲基苯己酸盐进行,产生l-芳基-3-甲氧基羧腈
亚胺,这些
亚胺会被电子吸引体和电子释放体的烯烃截留,例如
甲基丙烯酸酯、
环戊烯、
乙烯基环丙烷或乙基
乙烯醚,从而形成相应的
吡唑啉和
吡唑。在
丙酮-2-醇存在下,主要反应通过腈与O—H键的加成反应进行,形成甲基2-异丙氧基-2-[2-(4-
甲氧基苯基)
肼基]
乙酸酯。