... Journal of the ... The organic phase was separated and washed once more with NH 4 Cl, three times with water, once with brine, and then it was dried over Na ... 1 H NMR (400 MHz, CDCl 3 , room temperature): δ 8.70 (d, 3 J = 5 Hz, 1H), 8.65 (m, 2H), 8.49 (s, 1H), 8.44 (s, 1H), 8.36 ...