Hydrochloric Acid → HCID 13663054, compound

Participants

Reaction Steps

Hydrogen chloride gas was passed for 30 minutes through a mixture of 3-methylbenzo[b]thiophene-5-carboxylic acid ethyl ester (5.50 g), anhydrous zinc chloride (1.25 g) and paraformaldehyde (1.50 g) in chloroform (50 ml). The resulting mixture was stirred for 8 hours and then the chloroform solution was decanted off from the gummy residue, washed well with water and dried (Na2SO4). Evaporation of the solvent gave crude 2-chloromethyl-3-methylbenzo[b]thiophene-5-carboxylic acid ethyl ester which was used directly in the next stage.

Provenance & Evidence