“…The mixture was cooled overnight and filtered off under vacuum. Purification was done by column chromatography (silica-gel) using dichloromethane as eluant, the purple solid of compound 1 (1.2 g) was obtained in the yield of 4.9 per cent, mp > 300°C; 1 H NMR (500 MHz, CDCl 3 , d /ppm): -2.77 (s, 2H, pyrrole), 7.15 (d, J = 8.0 Hz, 2H, Ph), 7.73-7.77 (m, 9H, Ph), 8.06 (d, J = 8.0 Hz, 2H, Ph), 8.20-8.22 (m, 6H, Ph), 8.84-8.87 (m, 8H, pyrrole) (Osati et al, 2010;Sun et al, 2006;Tomé et al, 2005).…”