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We describe a novel and most convenient method for dehydrogenating various annulated dihydropyridazines, being formed by inverse [4+2] cycloadditions of cyclic alkenes with 1,2,4,5-tetrazines, with the easily accessible 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) as dehydrogenating agent.
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