1,6,7,12-Tetrachloroperylene tetracarboxylic acid dianhydride

128-69-8

156028-26-1

3,4,9,10-tetracarboxylic dianhydride (3.30 g, 8.41 mmol) was used as a raw material, mixed with chlorosulfonic acid (20 mL, 300 mmol) and iodine (0.56 g, 2.20 mmol), and the reaction was stirred for 30 hours at 65 °C. Upon completion of the reaction, the mixture was cooled to room temperature and subsequently added slowly dropwise to an ice-water mixture. The precipitated red solid product was collected by filtration in a yield of 4.14 g in 92% yield. The product was analyzed by 1H NMR (d-DMSO, ppm) showing: 8.75 (s, 4H, aryl proton). 13C NMR (d-DMSO, ppm) analysis showed: 119.75, 125.29, 129.5, 134.88, 136.22, 158.16, 168.53. mass spectral (EI) analysis showed: m/z 532.