Aza-2-diènes-1,3. 2. Synthèse et structure d'un ylure d'azométhine stable

2-Aza-1,3-dienes. 2. Synthesis and Structure of a Stable Azomethine-ylid. Thermal treatment of 2-(2′-cyano-2′-methoxycarbonyl)methylide-amino-1-morpholino-cyclohexene results in the formation of a stable isomere. Its azomethine-ylid structure is demonstrated from the spectroscopic data (UV., IR., ¹H- and ¹³C-NMR.). 1,3-dipolar cycloaddition reactions of this ylid leads to spiropyrrolines.