Hydrochloric Acid → 4-[[4-(1-Methylethoxy)phenyl]methyl]benzenamine

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Reaction Steps

A mixture of 4-(4-isopropoxybenzoyl)-nitrobenzene (14.0 g, 49.09 mmol) and 10% palladium on carbon (2.0 g) in a solution of ethanol (250 mL) and concentrated hydrochloric acid (30 mL) was hydrogenated at 50 psi in a Parr apparatus for 16 hours. The catalyst was removed by filtration through a Celite pad, and filtrate was concentrated in vacuo. The residue was diluted with ice cold water, basified with concentrated ammonium hydroxide solution, and extracted into ethyl acetate. The organic extracts were washed with water and brine, and dried (MgSO4). Removal of the solvent gave a thick oil which on crystallization from ethyl acetate/hexanes gave 4-(4-isopropoxybenzyl)-phenylamine (10.4 g, 87%) as a white solid, m.p. 92-93° C.; Analysis for C16H19NO: Calc.: C, 79.63; H, 7.94; N, 5.80; Found: C, 79.51; H,7.92; N, 5.96. MS m/e (%): 241 (M+, 83).

Provenance & Evidence