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Reaction of arylsulfonyl, pyridylearbonyl and arylalkylhydrazines 2 with 2,4‐dinitrophenyl‐pyridinium chloride 1 affords N ‐iminopyridinium ylides 3. The sodium borohydride reduction of ylides 3 to N ‐imino‐1,2,3,6‐tetrahydropyridines is described.
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Knaus et al. (1976) studied this question.
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