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几个 Mannich 碱在中性或微酸性的情况下制成它们的缩氨基脲,其中一个Mannich 碱在碱性情况下形成一个含有两分子氨基脲的物质。那些 Mannich 碱缩氨基脲的季铵碱当在碱性情况下递降时生成乙稀酮的缩氨基脲,而不生成环状的化合物(Ⅳ)。从二苯甲基酮衍生的一个 Mannich 碱经醋酸钠作用后变为原来的1,3-二苯基丙酮,但这个 Mannich 碱的季铵盐经碱作用后成为乙稀酮,而这个乙烯酮迅速贰聚。几个4,5-二氢隣二氮杂茂自 Mannich 碱如预期地形成。上列许多产物的紫外线光谱曾经测定。
Several Mannich bases make their semicarbazones under neutral or slightly acidic conditions, where one Mannich base, in the alkaline case, forms a substance containing two molecules of semicarbazide. The quaternary ammonium bases of those Mannich base semicarbazones, when desalinated in alkaline conditions, produce acetamidic semicarbazones without forming cyclic compounds (IV). A Mannich base derived from benzophenone is converted to the original 1,3-diphenylacetone by the action of sodium acetate, but the quaternary ammonium salt of this Mannich base becomes ethanolate after base action, and this ketene II quickly gather. Several 4,5-dihydrophthalazoles are formed from Mannich base as expected. The UV spectrum of many of the above products was determined.