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Condensation of benzoylacetonitrile (1a) and benziminoacetonitriles (1b, c), resp., with tho hydrazines 2a-f leads to benzoylacetonitrile-hydrazones (3a-i), which react with tetracyanoethylene to give pyrazolo[3,4-b]pyridines (6a-d) and polymethines (7a, b, 8), resp.

zeitschrift für naturforschung b

Synthesen mit Nitrilen, LXV [1]. Pyrazolo [3,4-b] pyridine und Polymethine aus Benzoylacetonitril-hydrazonen und Tetracyanethylen / Syntheses with Nitriles, LXV [1]. Pyrazolo[3,4-b]pyridines and Polymethines from Benzoylacetonitrile-hydrazones and Tetracyanoethylene