Ethynyl-substituted nitronyl nitroxide is involved in the 1,3-dipolar cycloaddition with cyclic nitrones without affecting the nitronyl nitroxide fragment. The reaction of 2,4,4,5,5-pentamethyl-4,5-dihydro-1H-imidazole 3-oxide produces the corresponding 1,2,3,7a-tetrahydroimidazo[1,2-b]isoxazole derivative. The analog of the latter derived from 4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole 3-oxide is transformed into spin-labeled aminoenal. The solid phase of aminoenal is formed by packing unsymmetrical trimers resulting from the self-assembling of the molecular fragments based on a hydrogen bond network.
乙炔基取代的硝基硝基氧参与与环状硝酮的 1,3-偶极环加成,而不影响硝基硝基氧片段。 2,4,4,5,5-五甲基-4,5-二氢-
1H-咪唑3-氧化物的反应产生相应的1,2,3,7a-四氢
咪唑并[1,2-b]
异恶唑衍
生物。后者衍生自4,4,5,5-四甲基-4,5-二氢-
1H-咪唑3-氧化物的类似物被转化为自旋标记的
氨基烯醛。
氨基烯醛的固相是通过堆积基于氢键网络的分子片段自组装产生的不对称三聚体而形成的。