反应详情

A solution of 2-hydroxy-5-methyl-3-nitroacetophenone [4.0 g; Joshi et al., J. Amer. Chem. Soc., (1954), 76, 4993] in ethanol (150 ml) was hydrogenated at 25° C. and 3.5 kg/cm2 for 44 minutes using a catalyst of platinum on charcoal. The solution was filtered and the filtrate was evaporated at 30° C. under diminished pressure to give a dark red oil, which set to a semi-solid on standing overnight. This material was purified by chromatography on a column of silica gel using diethyl ether as eluant. The fastest running band (yellow) was collected to give 3-amino-2-hydroxy-5-methylacetophenone (2.3 g), m.p. 56°-58° C., in the form of a bright yellow solid.

1. customwas hydrogenated at 25° C.
2. filtrationThe solution was filtered
3. customthe filtrate was evaporated at 30° C. under diminished pressure
4. customto give a dark red oil, which
5. waiton standing overnight
6. customThis material was purified by chromatography on a column of silica gel
7. customwas collected