Potassium Iodide → HCID 13091009, compound

Participants

Reaction Steps

A mixture of 4.6 parts of 7-(5-bromopentyloxy)4-oxo-4H-1-benzopyran-2-carboxylic acid, ethyl ester, 2 parts of ethyl 7hydroxychromone-2-carboxylate,1,8 parts of potassium carbonate, a few potassium iodide crystals and 80 parts by volume of dry acetone was refluxed on a steam bath for 20 hr. The cooled mixture was filtered and the filtrate evaporated down to give an oil which when treated with petroleum ether (40°-60°), solidified to give 4.0 parts of crude product. Crystallisation from ethanol gave 2.9 parts of 7-[5-(4-oxo-4H-1-benzopyran-7-yloxy)pentyloxy]-4-oxo-4H-1-benzopyran-2-carboxylic acid; ethyl ester, m.p. 113°-116°.

Provenance & Evidence