C16H17N3O2, orthorhombic, Pna2\ (no. 33), a = 20.196 (4) A, b = 6.215(1)A,c = 11.243(2)Ä, V= 1411.3 A 3 ,Z = 4, Rgi(F) = 0.048, wR^F 2 ) = 0.113, Τ = 293 Κ. Source of material 2-Hydroxybenzoylhydrazine (0.02 mol, 3.04 g) was dissolved in anhydrous ethanol (50 ml) and 4-dimethylaminobenzaldehyde (0.02 mol, 2.98 g) was added to it. The mixture was refluxed for 2 h, the precipitate formed was collected by filtration, and washed with ethanol. The product was recrystallized from ethanol and dried

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... er reduced pressure to give the title compound. The compound (2.0 mmol, 0.56 g) was dissolved in DMF (30 ml) and kept at room temperature for 30 d to obtain yellow block crystals, which were collected and washed with distilled water.