反应详情

Concentrated sulfuric acid (40 ml) was carefully added to a solution of 2,6-dihydroxybenzoic acid (133 g, 0.86 mol) in absolute methanol (500 ml). The reaction mixture was heated at reflux temperature for 24 hours, cooled, and evaporated. The residue was added to aa saturated sodium hydrogencarbonate solution, and the resulting solid was collected by filtration, washed with water, and dried in vacuo over phosphorus peroxide; yield 49 g (34%). NMR (CDCl3, 60 MHz): δ4.02 (s, CO2CH3) p.p.m.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux temperature for 24 hours
3. temperaturecooled
4. customevaporated
5. additionThe residue was added to aa saturated sodium hydrogencarbonate solution
6. filtrationthe resulting solid was collected by filtration
7. washwashed with water
8. dry with materialdried in vacuo over phosphorus peroxide