ChemInform Abstract: Intramolecular Cycloaddition Reactions of in situ Generated Azoalkenes. Synthesis of Pyrrolo[1 ,2‐b]pyridazine Derivatives from α‐Haloketone 4‐Pentenoylhydrazones. Die aus 4‐Pentensäurehydrazid (I) und α‐Halogenketonen (II) zugänglichen Hydrazone (III) bilden bei der Einwirkung von Natriumcarbonat Azoalkene (IV), die so‐fort in einer [4 + 2]‐Cycloaddition unter Bildung der anellierten Heterocyclen (V) abreagieren. (IR‐, NMR‐Daten).
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