反应详情

Benzoic acid (2.4 g) is dissolved in dichloromethane (30 ml), and thereto are added triethylamine (2.8 ml) and further 1-(p-chlorobenzenesulfonyloxy)-6-chloro-1,2,3-benzotriazole (6.9 g) and the mixture is stirred for 4 hours. After the reaction, dichloromethane is distilled off and to the resulting residue are added water and ethyl acetate. The ethyl acetate layer is washed with water, an aqueous sodium hydrogen carbonate and water in order, dried over anhydrous magnesium sulfate and the solvent is distilled off to give white crystals of 1-benzoyloxy-6-chloro-1,2,3-benzotriazole (4.55 g). The product is recrystallized from ethanol to give pure product, melting point: 132° C.

1. distillationis distilled off and to the resulting residue
2. additionare added water and ethyl acetate
3. washThe ethyl acetate layer is washed with water
4. dry with materialan aqueous sodium hydrogen carbonate and water in order, dried over anhydrous magnesium sulfate
5. distillationthe solvent is distilled off