反应详情

An amount of 1.7 g of 2-hydroxy-9-carboxy-10,11-dihydrodibenzo[b,f]thiepin was dissolved in 50ml of anhydrous ethanol and the mixture was refluxed for 3 hours, while hydrogen chloride gas was bubbled into the mixture. The solvent was distilled off to obtain the residue which was dissolved in the mixed solvent of ethyl acetate-benzene. The solution was washed with saturated sodium chloride solution and freed of solvent by distillation to obtain 1.6 g (85%) of 2-hydroxy-9-ethoxycarbonyl-10,11-dihydrodibenzo[b,f]thiepin as brown crystals having a melting point of 125°-129° C.

1. customwas bubbled into the mixture
2. distillationThe solvent was distilled off
3. customto obtain the residue which
4. washThe solution was washed with saturated sodium chloride solution
5. distillationfreed of solvent by distillation