n-Methyl-p-aminophenol → 4-(Methylamino)cyclohexan-1-ol

17 Grams of p-methylaminophenol, 20 ml of triethylamine and 9 g of 5% rhodium alumina are added to 200 ml of methanol and the mixture is shaken at the temperature of 60° to 70° C. and under hydrogen pressure of 3 to 4 atm. for 16 hours to effect hydrogenation. After the reaction, the catalyst is filtered off and the mother liquor is concentrated and evaporated to dryness, and the residue is added with 500 ml of chloroform and 200 ml of 5% aqueous NaOH solution. After separating the liquid, the chloroform layer is washed with water and concentrated, and the residue is further distilled under reduced pressure. This treatment gives 11 g of 4-methylaminocyclohexanol with boiling point of 123°-129° C. (at 22 mmHg).

1. customAfter the reaction
2. filtrationthe catalyst is filtered off
3. concentrationthe mother liquor is concentrated
4. customevaporated to dryness
5. additionthe residue is added with 500 ml of chloroform and 200 ml of 5% aqueous NaOH solution
6. customAfter separating the liquid
7. washthe chloroform layer is washed with water
8. concentrationconcentrated
9. distillationthe residue is further distilled under reduced pressure

ORD record

ord-9569c6fe7b3143f68460f76fe4797457

Source dataset

uspto-grants-1981_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04298739