Hydrochloric Acid → 2-(4-Isobutylphenyl)propionamide hydrochloride

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A solution of 2-(4-isobutylphenyl)propionitrile (0.2 g; 1.07 mmol) in a (1:1) diethyl ether/methyl alcohol mixture (20 mL) is cooled at T=0-5° C. and gaseous HCl is bubbled into the solution for 1 h. Then the temperature is left to arise to r.t. and the mixture stirred overnight. After solvent evaporation under reduced pressure, the crude is dissolved in methyl alcohol (10 mL) and cooled at T=0-5° C. Ammonia is bubbled into for 1 h and the resulting mixture is left stirring overnight at r.t. After solvent evaporation under reduced pressure, the crude is suspended in diethyl ether (15 mL) and left stirring at r.t. for 2 h. The 2-(4-isobutylphenyl)propionamide hydrochloride (I) is isolated by filtration in vacuo as white solid (0.193 g; 0.80 mmol). Yield 75%. 1H-NMR (DMSO-d6): δ 8.80-8.50 (bs, NH3+Cl−); 7.40 (d, 2H, J=7 Hz); 7.15 (d, 2H, J=7 Hz); 3.98 (q, 1H, J=8 Hz); 2.42 (d, 2H, J=8 Hz); 1.90 (m, 1H); 1.57 (d, 3H, J=8 Hz); 0.88 (d, 6H, J=8 Hz).

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