“…The crude product was purifi ed by column chromatography using CHCl 3 as eluent to give purple-brown solid (3.49 g, 70% yield). 1 [3,4-c]pyrrole-1,4(2H,5H)-dione ( 1) : To a solution of 2,5-dihexadecyl-3,6-di(thiophen-2-yl)pyrrolo [3,4-c]pyrrole-1,4(2H,5H)-dione (2.00 g, 2.67 mmol) in 400 mL of CHCl 3 and 100 mL of glacial AcOH, NBS (1.04 g, 5.87 mmol) was added slowly in three portions. The reaction was covered with aluminum foil and stirred overnight at room temperature.…”