Piperazine,1-(4-nitrophenyl)-4-(4-pyridinyl)- → 1-(4-Aminophenyl)-4-(4-pyridyl)piperazine

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A mixture of 1-(4-nitrophenyl)-4-(4-pyridyl)piperazine (2.07 g) in ethanol (100 ml) was hydrogenated at room temperature under a pressure of 2 bars in the presence of 10% palladium on charcoal (0.25 g). When reduction was complete, the catalyst was filtered off and the filtrate was evaporated. The residue was crystallised from methanol/ethyl acetate to give 1-(4-aminophenyl)-4-(4-pyridyl)piperazine (1.08 g), m.p. 210°-211° C. Found: C,70.47; H,7.07; N,21.56. C15H18N4 requires: C,70.83; H,7.13; N,22.03%.

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