4-Hydroxybenzoic acid hydrazide → 4-Hydroxy-benzoic acid (4-bromo-3,5-dimethyl-1H-pyrrol-2-ylmethylene)-hydrazide

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To a solution of 4-hydroxy-benzoic acid hydrazide (0.06 g, 0.0004 mol) and 4-bromo-3,5-dimethyl-pyrrole-2-carboxaldehyde (0.08 g, 0.0004 mol) in abs. EtOH (5 mL), was added 1 drop of acetic acid. The reaction mixture was refluxed for 5 hours. The reaction mixture was cooling to room temperature and concentrated to remove solvent. The resulting residue was solidified by EtOAc to give red solid 0.1 g, in 77% yield, mp: 235.4° C. 1H NMR (DMSO-d6) δ 11.46 (s, 1H), 11.21 (s, 1H), 9.99 (s, 1H), 8.26 (s, 1H), 7.76 (d, 2H), 6.82 (d, 2H), 2.15 (s, 3H), 2.03 (s, 3H). 13C NMR (DMSO-d6) δ 163.9, 162.2, 140.2, 131.6, 131.3, 126.1, 124.0, 124.3, 116.8, 13.4, 11.8. Anal. Calcd for C14H14BrN3O2.¼H2O: C, 49.35; H, 4.14; N, 12.33; Br, 23.69. Found: C, 49.21; H, 3.95; N, 11.96; Br, 23.37.

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