反应详情

55.23 g (0.199 mol) of methyl 2-chloro-3-formyl-4-methylsulfonylbenzoate are suspended in 400 ml of methanol/100 ml of water and treated with 15.27 g (0.219 mol) of hydroxylammonium chloride. 11.56 g (0.11 mol) of sodium carbonate—dissolved in 100 ml of water—are then slowly added dropwise at room temperature. After stirring at room temperature for 4 hours, the methanol is removed in a rotary evaporator, the residue is diluted with water and the mixture is extracted three times with dichlormethane. 56.05 g (96% of theory) of methyl 2-chloro-3 hydroximinomethyl-4-methylsulfonylbenzoate having a melting point of 126-130° C. are obtained.

1. additionare then slowly added dropwise at room temperature
2. customthe methanol is removed in a rotary evaporator
3. additionthe residue is diluted with water
4. extractionthe mixture is extracted three times with dichlormethane