反应详情

To 0.1 mol 2,2′-biphenyl dicarboxylic acid anhydride were added 0.3 mol ethanol, 40 ml toluene, and 0.4 ml concentrated sulfuric acid with stirring. Then the reaction mixture was heated refluxing and the water produced was removed by using a water separator until the amount of the water separated reached theoretical value. Upon the reaction completion, the mixture was neutralized with saturated sodium carbonate solution and extracted with ethyl acetate. The upper layer was separated, washed with saturated saline to neutrality, and dried over anhydrous sodium sulfate. The solvent was removed. Distillation under reduced pressure gave diethyl 2,2′-biphenyldicarboxylate as a colorless liquid, and the yield was 90%.

1. temperatureThen the reaction mixture was heated
2. temperaturerefluxing
3. customwas removed
4. customseparated
5. extractionextracted with ethyl acetate
6. customThe upper layer was separated
7. washwashed with saturated saline to neutrality
8. dry with materialdried over anhydrous sodium sulfate
9. customThe solvent was removed
10. distillationDistillation under reduced pressure