1,5-Dimethyl-indoline-2,3-dione when treated under various conditions with benzoyl hydrazine yields 1,5-dimethy1-3-{benzoylhydrazono)-indolin-2~ne. Spectral data of hydrazone and its benzoyl/acetyl derivative indicate that there is an intramolecular hydrogen bonding in I between the imino proton of hydrazone residue and t"e C-2 carbonyl group.
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