The 1,2,3-oxadiazolidines resulting from the addition of 4,4′-dicyano-azoxybenzene to trans-cyclooctene or cis, trans-cycloocta-1,5-diene are not stable, bu suffer 1,3-dipolar cycloreversion to give an azomethine imine; this intermediate is either captured by a second molecule of the strained cycloalkene to give 1:2 adducts in high yields or it tautomerizes to an enehydrazine. 4,4′-Dinitroazoxybenzene
由向反式-环
辛烯或顺式,反式-环辛基-1,5-二烯中添加4,4'-二
氰基-氮杂
偶氮苯所得的
1,2,3-恶二唑烷不稳定,但会遭受1,3-偶极环还原成给出一个甲
亚胺亚胺; 该中间体要么被第二个应变的环烯烃分子捕获,以高收率得到1:2加合物,要么互变异构为烯
肼。4,4'-二硝基氮氧基苯与苯并[c] cinnoline N-氧化物类似地反应。