反应详情

To a mixture of 7.7 g (37.7 mmol) of 4-(2-tetrahydropyranyloxyethoxy)benzoic acid and 31 ml (754 mmol) of anhydrous methanol, at RT, is added 2 drops of conc. sulfuric acid. The mixture is stirred at RT for 1 day and is then rotoevaporated to near dryness. To the residue is added 100 ml water, 50 ml ether and 30 ml aqueous 15% potassium carbonate, and the mixture is stirred until the solid is dissolved. The organic phase is separated and discarded; 150 ml of ethyl acetate and 50 ml of aqueous 3 N sulfuric acid are added to the remaining aqueous phase. The aqueous phase is then separated and extracted with ethyl acetate (80 ml, 3×). The combined organic phases are washed with aqueous saturated sodium chloride (50 ml, 2×) and then dried over calcium sulfate. Removal of solvent by rotoevaporation gives 4-(hydroxyethoxy)benzoic acid.

1. stirringthe mixture is stirred until the solid
2. dissolutionis dissolved
3. customThe organic phase is separated
4. addition150 ml of ethyl acetate and 50 ml of aqueous 3 N sulfuric acid are added to the remaining aqueous phase
5. customThe aqueous phase is then separated
6. extractionextracted with ethyl acetate (80 ml, 3×)
7. washThe combined organic phases are washed with aqueous saturated sodium chloride (50 ml, 2×)
8. dry with materialdried over calcium sulfate
9. customRemoval of solvent by rotoevaporation