4-Aminophenol → 4-(1,1-Difluoro-2,2,2-trichloroethoxy)aniline

2.0 g (18.3 mmol) of p-aminophenol was added over a period of 10 minutes to a mixture of 0.48 g (20.1 mmol) of sodium hydride in 20 ml of dry DMSO. The mixture was stirred for 20 minutes. 3.73 g (18.3 mmol) of 1,1-difluoro-tetrachloroethane was added causing an exotherm to 47° C. The mixture was stirred at 60° C. for 2 hours, then poured into ice water. The brown solid was collected by filtration, dried, dissolved in ether and then HCl gas was bubbled into the solution causing the above-named aniline to precipitate as the hydrochloride salt. The white solid (4.4 g, 87 percent of theoretical d 250° C.) was collected by filtration.

1. customto 47° C
2. stirringThe mixture was stirred at 60° C. for 2 hours
3. filtrationThe brown solid was collected by filtration
4. customdried
5. dissolutiondissolved in ether
6. customHCl gas was bubbled into the solution
7. customto precipitate as the hydrochloride salt
8. filtrationThe white solid (4.4 g, 87 percent of theoretical d 250° C.) was collected by filtration

ORDレコード

ord-ce4291de36e44412b9bd74ae5712ae97

出典データセット

uspto-grants-1993_10

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US05250690