Carbon Dioxide → HCID 15022347, compound

Participants

Reaction Conditions

Reaction Steps

4-Chlorothiophene-3-carboxanilide (14.6 g, 0.061 mol) is dissolved in 450 ml of tetrahydrofuran, the solution is cooled to -70° C. and n-butyllithium (0.13 mol, 1.6N solution in n-hexane) is added. After 30 minutes, carbon dioxide gas is passed in until the solution is saturated, and the solution is allowed to warm up slowly to room temperature. It is worked up by evaporating to dryness, taking up the solid residue in a mixture of water, sodium hydroxide solution and ethyl acetate, separating the phases and acidifying the aqueous phase with hydrochloric acid. The carboxylic acid is precipitated. Yield: 13.5 g, 78%; mp. 208° to 210° C.

Provenance & Evidence