6-Nitro-m-cresol → 2-Amino-5-methylphenol

Temperature

50 °C

To an autoclave, there were fed 1.5 g of palladium carbon, 50.0 g (moisture content: 5.9%; 308 mmol) of 5-methyl-2-nitrophenol and 250 ml of methanol. The mixture was stirred under a hydrogen pressure of 20 kg/cm2 at 50° C. for 3 hours. After cooling, the catalyst was filtered and washed with 50 ml of warm methanol twice and the washing liquor was combined with the filtrate. After distilling off the solvent under reduced pressure, the residue was dried. Thus 37.3 g (303 mmol) of 6-amino-m-cresol was obtained as a brown solid. The yield was 98%. A 15.0 g portion of this brown solid product was recrystallized from 45 ml of isopropanol. Thus 11.9 of 6-amino-m-cresol was obtained as yellow crystals. The recovering yield was 79%.

1. temperatureAfter cooling
2. filtrationthe catalyst was filtered
3. washwashed with 50 ml of warm methanol twice
4. distillationAfter distilling off the solvent under reduced pressure
5. customthe residue was dried

ORD record

ord-0d9832b22143470f9eec26d643222ca7

Source dataset

uspto-grants-1994_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05334225