Carbon Dioxide → HCID 23320901, compound

Participants

Reaction Steps

A solution of 5-bromo-2-hydroxymethyl-3-methylbenzofuran (Annalen, 1112, 1973) (1.93 g) in dry ether (50 ml) was added dropwise to a stirred solution of n-butyl-lithium (12.90 ml of 1.55 M solution in hexane) in dry ether (50 ml) at 0° C. under an atmosphere of dry nitrogen. The mixture was stirred at 0° for 2 hours and then poured onto a mixture of crushed solid carbon dioxide and ether. When all the carbon dioxide had evaporated the mixture was shaken with water. The aqueous layer was separated, washed with ether and acidified with concentrated hydrochloric acid. The solid was filtered off, washed with water, dried and crystallised from isopropanol/petrol (b.p. 80°-100°) to give 2-hydroxymethyl-3-methylbenzofuran-5-carboxylic acid (0.50 g). m.p. 220°-222°.

Provenance & Evidence