Hydrochloric Acid → 4-Amino-3,5-dimethylphenol

An aqueous solution (4 ml) of sodium nitrite (1.90 g, 27.5 mmol) was added to an aqueous solution (20 ml) of sodium sulfanilate dihydrate (5.78 g, 25.0 mmol). The resulting solution was dropped into a beaker containing concentrated hydrochloric acid (5.1 ml) and ice (30 g), and the resulting mixture was kept cold in an ice bath for 20 minutes to prepare solution A. An aqueous solution (30 ml) of sodium hydroxide (5.50 g, 138 mmol) and ice (20 g) were added to 3,5-dimethylphenol (3.05 g, 250 mmol) to effect dissolution, and then solution A was added dropwise thereto in an ice bath. The resulting solution was stirred in the ice bath for 1 hour and then heated to 65° C. to 75° C., and sodium dithionate (16.8 g, 96.5 mmol) was added thereto until the solution lost its color. The solution was cooled to room temperature and stirred for 30 minutes, and the solid formed was collected by filtration and dried to obtain 4-amino-3,5-dimethylphenol (2.46 g, 72%).

1. additionThe resulting solution was dropped into a beaker
2. dissolutiondissolution
3. temperatureheated to 65° C. to 75° C.
4. customthe solid formed
5. filtrationwas collected by filtration
6. customdried

ORDレコード

ord-619b2a472ba4459cbe0b2dba7f1051c8

出典データセット

uspto-grants-2007_04

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07199147B2