反应详情

Phthalic anhydride (17.8 g, 0.1 mole) is suspended in 100 ml. dry methylene chloride (previously distilled over anhydrous potassium carbonate). To the suspension is added anhydrous aluminum chloride (30.5 g, 0.23 mole) in one portion. The suspension quickly became bright yellow and is stirred at room temperature for 2 hours. A solution of p-dimethoxybenzene (27.6 g, 0.2 mole) in methylene chloride (100 ml) is added slowly to the vigorously stirred solution. The reaction mixture is stirred overnight at 25° and poured onto ice (300 g) and concentrated hydrochloric acid (50 ml). The slurry was stirred for 30 minutes and extracted with chloroform (4 × 150 ml). A white precipitate suspended in the aqueous layer is collected by filtration. The organic extract was washed once with water (200 ml) and washed with saturated sodium bicarbonate (4 × 150 ml). The aqueous bicarbonate extract is washed once with chloroform (150 ml) and acidified with concentrated hydrochloric acid, the mixture cooled on an ice bath and filtered. The residue is washed well with water and dried under reduced pressure and combined with the white precipitate to yield 2-(2' ,5'-dimethoxybenzoyl) benzoic acid (I) as a pale yellow solid.

1. distillationdry methylene chloride (previously distilled over anhydrous potassium carbonate)
2. stirringThe reaction mixture is stirred overnight at 25°
3. stirringThe slurry was stirred for 30 minutes
4. extractionextracted with chloroform (4 × 150 ml)
5. filtrationis collected by filtration
6. extractionThe organic extract
7. washwas washed once with water (200 ml)
8. washwashed with saturated sodium bicarbonate (4 × 150 ml)
9. extractionThe aqueous bicarbonate extract
10. washis washed once with chloroform (150 ml)
11. temperaturethe mixture cooled on an ice bath
12. filtrationfiltered
13. washThe residue is washed well with water
14. customdried under reduced pressure