Carbon Dioxide → HCID 13540118, compound

Participants

Reaction Steps

A solution of 5-hydroxymethyl-3-methylbenzo[b]thiophene (8.50 g.) in dry ether (120 ml.) was added dropwise to a stirred solution of n-butyl lithium (72 ml. of 1.6 M solution in hexane) in dry ether (120 ml.) at 0° under an atmosphere of dry nitrogen. The resulting 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 and acidified with concentrated hydrochloric acid. The solid was filtered off, washed well with water and crystallized from ethanol to give 5-hydroxymethyl-3-methylbenzo[b]thiophene-2-carboxylic acid (4.80 g.), m.p. 260°-262°.

Provenance & Evidence