Sulfuric Acid → n-(2,6-Dichloro-4-carboxyphenyl)-7-methoxy-2-(1-methylethyl)benzofuran-4-carboxamide

Participants

Reaction Steps

3.7 g of N-(2,6-Dichloro-4-methoxycarbonylphenyl)-7-methoxy-2-(1-methylethyl)benzofuran-4-carboxamide are refluxed for 15 min. in 20 ml of diethylene glycol and 30 ml of water in which 0.41 g of caustic soda is dissolved. The solution is diluted with water and acidified to pH 2 using 2 N sulfuric acid. The product precipitates in this process. It is filtered off with suction on a suction filter, washed free of acid with water and dried in vacuo: m.p. 279° C.

Provenance & Evidence