Hydrochloric Acid → N-(4-hydroxyphenyl)methanesulfonamide

Temperature

20 °C

5.4 g (49.5 mmol) of p-aminophenol are dissolved in 40 ml of anhydrous pyridine, and 5.7 g (1 equivalent) of methanesulfonyl chloride diluted in 12 ml of pyridine are added over 15 minutes at 20° C. under a stream of nitrogen. The reaction medium is stirred for 3 days at 20° C. and is then poured into 1.5 liters of water containing a sufficient amount of hydrochloric acid (67 g of 36% HCl) to neutralize the pyridine and to establish a pH≦1.5. The aqueous phase is separated out by settling and extracted twice with 250 ml of ethyl acetate. The organic phases are combined and washed with twice 250 ml of water and then concentrated under vacuum. The residue is recrystallized from 40 ml of ethyl acetate. The crystals are filtered off at 0° C. and washed with 15 ml of ethyl acetate. 2.14 g of crude p-methanesulfonamidophenol are obtained.

1. additionare added over 15 minutes at 20° C. under a stream of nitrogen
2. customThe aqueous phase is separated out
3. extractionextracted twice with 250 ml of ethyl acetate
4. washwashed with twice 250 ml of water
5. concentrationconcentrated under vacuum
6. customThe residue is recrystallized from 40 ml of ethyl acetate
7. filtrationThe crystals are filtered off at 0° C.
8. washwashed with 15 ml of ethyl acetate

ORD record

ord-2761cb5bfb5845edbd7a2286a5b6b4ec

Source dataset

uspto-grants-2015_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08962869B2