反应详情

A mixture of 8.6 parts of 2-[p-(2-thenoyl)phenyl]acetonitrile, 18 parts of concentrated sulfuric acid, 10 parts of acetic acid and 10 parts of water is stirred and refluxed for one hour. The reaction mixture is cooled and poured onto 200 parts of ice-water. The product is extracted twice with 160 parts of ether. The combined extracts are washed with 100 parts of diluted sodium hydroxide solution and separated. The aqueous phase is acidified with concentrated hydrochloric acid solution, whereupon the product is separated as an oil. The latter is extracted with ether. The extract is dried and evaporated. The residue is triturated in petroleumether and the crude product is dissolved in chloroform. It is purified by column-chromatography, using a mixture of chloroform and 5% of methanol. The pure fractions are collected and the solvent is evaporated. The residue is triturated in petroleumether and the solid product is crystallized from acetonitrile at -20° C, yielding 2-[p-(2-thenoyl)phenyl]acetic acid; mp. 126°-129° C.

1. temperaturerefluxed for one hour
2. temperatureThe reaction mixture is cooled
3. extractionThe product is extracted twice with 160 parts of ether
4. washThe combined extracts are washed with 100 parts of diluted sodium hydroxide solution
5. customseparated
6. customis separated as an oil
7. extractionThe latter is extracted with ether
8. customThe extract is dried
9. customevaporated
10. customThe residue is triturated in petroleumether
11. dissolutionthe crude product is dissolved in chloroform
12. customIt is purified by column-chromatography
13. additiona mixture of chloroform and 5% of methanol
14. customThe pure fractions are collected
15. customthe solvent is evaporated
16. customThe residue is triturated in petroleumether
17. customthe solid product is crystallized from acetonitrile at -20° C