The preparation and properties of four isomeric azadibenzoeycloheptenones 3 and their 10,11‐dihydro derivatives 2 are described. The ketones 2 were prepared by cyclization of appropriately substituted phenethylpyridine carboxylic acids and dehydrogenated to 3 . Four monochloro derivatives 24 of the 4‐azaketone 2d are also described.
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Villani et al. (1971) studied this question.
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