Hydrochloric Acid → Benzo(b)thiophene-3-carboxylic acid

Participants

Reaction Steps

To a methanol (100 mL) solution of 1-benzothiophene-3-carboxylic acid methyl ester (20.6 g, 107 mmol), tetrahydrofuran (200 mL), water (100 mL) and lithium hydroxide (9.00 g, 214 mmol) were added at room temperature, and the mixture was stirred for 15 hours at room temperature. 1N-hydrochloric acid (214 mL, 214 mmol) was added to the reaction liquor, and then methanol was distilled off under reduced pressure. To the obtained aqueous layer, 1N-hydrochloric acid (50 mL, 50 mmol) was added, and the solids generated therefrom were collected by filtration, washed with water, and then dried for two days at 50° C. using a vacuum pump, to obtain the title compound (19.1 g, 100%) as a solid.

Provenance & Evidence