One-Pot Synthesis of 4,8-Dibromobenzo[1,2-c;4,5-c′]bis[1,2,5]thiadiazole

A one-step synthesis of 4,8-dibromobenzo[1,2-c;4,5-c′]bis[1,2,5]thiadiazole with use of 1,2,4,5-tetraaminobenzene tetrahydrobromide and thionyl bromide in good yield is reported. This unit can then be used in the synthesis of low bandgap materials via palladium-catalyzed coupling reactions. The approach offers a quick and easy way to prepare low bandgap materials as compared to the current literature methods.