Chlorodifluoromethane → 3-Difluoromethoxy-2-nitrotoluene

To a mixture of 43.0 g of 3-methyl-2-nitrophenol, 250 ml of p-dioxane, 150 ml of water, and 75 ml of 50% sodium hydroxide solution at 70° C. was added gaseous difluorochloromethane at a steady rate. The pH of the reaction was checked periodically. If the pH became acidic, 30 to 40 ml of 50% sodium hydroxide solution was added. After six hours of heating, the flow of the difluorochloromethane was halted and the reaction allowed to cool to room temperature. After standing overnight the reaction solution was poured onto a mixture of 50 g of ice and 250 ml of water and extracted with two 450 ml portions of ethyl acetate. The organic phase was dried with magnesium sulfate, filtered and concentrated. The resulting brown liquid was dried in a vacuum oven at 45° C. overnight to yield 53.3 g of the desired intermediate.

1. temperatureAfter six hours of heating
2. extractionextracted with two 450 ml portions of ethyl acetate
3. dry with materialThe organic phase was dried with magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe resulting brown liquid was dried in a vacuum oven at 45° C. overnight

ORD-Eintrag

ord-7f59adfcea184e8f9326b22f991e3b7c

Quelldatensatz

uspto-grants-1996_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05500405