反应详情

A stirred solution of 7.96 g of 2-[4-(4-hydroxybutyl)phenoxymethyl]-3-thiophenecarboxylic acid methyl ester, 14.41 g of potassium hydroxide, 15 ml of water and 100 ml of 95% ethanol was refluxed for one hour. The solution was concentrated. The residue was diluted with 200 ml of water and the solution was extracted once with ether. The aqueous phase was acidified with concentrated hydrochloric acid, with cooling, and the precipitate was collected, washed with water and dried in vacuo at 40° C. overnight over sodium hydroxide pellets. Recrystallization from 20 ml of 95% ethanol gave 6.62 g (88%) of product, m.p. 139.5°-141° C.

1. concentrationThe solution was concentrated
2. additionThe residue was diluted with 200 ml of water
3. extractionthe solution was extracted once with ether
4. temperaturewith cooling
5. customthe precipitate was collected
6. washwashed with water
7. dry with materialdried in vacuo at 40° C. overnight over sodium hydroxide pellets
8. customRecrystallization from 20 ml of 95% ethanol