Toluene → Benzphetamine Hydrochloride

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To a 100 ml 3-neck flask was added 25.07 g (0.1680 mole) of methamphetamine, 24.26 g (0.2289 mole) of sodium carbonate and 13.58 g of toluene. The mixture was stirred and heated to 120° C. Then 23.04 g (0.1820 mole) of benzyl chloride was added over 53 minutes. The reaction was continued for a total of 12 hr. After the reaction was completed the mixture was cooled to ambient temperature and 75 g of toluene and 150 g of water were added. After aggressively mixing the layers were separated and the water layer was washed twice with 30 ml portions of toluene. To the combined toluene layers was added 12.04 g of concentrated hydrochloric acid affording a pH of 1 in the water layer. The entire mixture was transferred to a 500 ml 3-neck flask fitted with a mechanical stirrer, Dean-Stark trap and condenser. The water was removed by azeotropic distillation. The benzphetamine hydrochloride crystallized upon cooling 60° C. to about 40° C. Filtration afforded 28.34 g (0.1027 mole) of benzphetamine HCl which is a 61% yield. The benzphetamine HCl had a melting point of 150.3-152.4° C.

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