Potassium Hydroxide → 5-Isopropylthiophene-3-carboxylic acid

Participants

Reaction Steps

A solution of AgNO3 (1.01 g, 5.92 mmol)in 10 mL of H20 and 15 mL of a solution of KOH (1.63 g, 40.8 mmol) were sequentially added to a solution of 760 mg (4.9 mmol) of 2-isopropyl-4-thiophene carboxaldehyde, from step 34a above, in 25 mL of ethanol. The resulting black mixture was stirred at room temperature for 2 hours and filtered. The filtrate was washed with ether, then acidified with 6N HCl and extracted with ether. The extract was washed with H2O and brine, dried over MgSO4 and concentrated to give 680 mg (81%) of the title compound as a yellow solid. mp. 64°-67° C.

Provenance & Evidence