Sodium Hydroxide → 3,5-Dichloro-4-fluoro-2-hydroxybenzoic acid

Participants

Reaction Conditions

Reaction Steps

2.27 g (0.01 mole) of 3,5-dichloro-2,4-difluorobenzoic acid, 1.62 g (0.04 mole) of powdery 99% sodium hydroxide and 20 ml of 1-methyl-2-pyrrolidone were fed into a 100-ml four-necked flask provided with a thermometer, a stirrer and a reflux condenser. The mixture was stirred at 130° C. for 2 hours to give rise to a reaction. Then, the same post-treatment as in Example 2 was conducted to obtain 2.07 g of 3,5-dichloro-4-fluorosalicylic acid. The isolated yield was 91.4% relative to the 3,5-dichloro-2,4-difluorobenzoic acid used.

Provenance & Evidence