Hydrochloric Acid → HCID 71014731, compound

Participants

Reaction Conditions

Reaction Steps

Benzo[1,2-b;4,5-b′]dithiophene-4,4,8,8-tetracarboxylic acid tetraethyl ester (95 g) was suspended in dioxane (2850 g) and KOH (356 g) under inert atmosphere and heated to 50° C. Hydrogenperoxide (111 g; w=35%) was added in portions over 3.5 hours and the suspension heated at 50° C. for 20 hours. The reaction mixture was acidified with 2M HCl (3500 g) and the yellow precipitate filtered off, washed with water and dried in vacuum to yield benzo[1,2-b;4,5-b′]dithiophene-4,8-dicarboxylic acid (50.6 g) in 92% yield.

Provenance & Evidence