2,5-Bis[4-(benzimidoylamino)phenyl]furan Dihydrochloride (Compound 6b) To a chilled solution of 2,5-bis(4-aminophenyl)furan (0.25 g, 1.0 mmol) in dry acetonitrile (10 ml) was added triethylamine (0.22 g, 2.1 mmol) followed dropwise by benzoyl chloride (0.30 g, 2.1 mmol) and the resulting suspension was stirred at room-temperature for 3 hours. Water (10 ml) was then added and the precipitate was collected, rinsed with water, followed by MeOH, and finally dried in vacuo to give 2,5-bis(4-benzamidophenyl)furan as a tan solid (0.44 g, 96%), mp 312-314.5° C. 1H NMR (DMSO-d6): 6.98 (s, 2H), 7.52-7.62 (m, 6H), 7.80 (d, 4H), 7.89 (d, 4H), 7.97 (d, 4H), 10.33 (br s, 2H).
