The preparation of 4-Nitrophenethylamine hydrochloride is as follows:Ten mL of 2M HCl was then added in a one-pot fashion, and, in all cases but threonine, the reaction vessel was heated to 190°Cover 5 min with stirring and then allowed to cool. In the case of the temperature-sensitive threonine, soxhlet extraction with toluene was performed at 80°C to remove R-carvone from the reaction mixture. The aqueous reaction mixture was washed three times with 25 mL of ether, and then water solvent was distilled off from the hydrochloride salt. The hydrochloride salt was transferred to a vacuum oven and dried overnight at 150 °C and 10 Torr.
