... European Journal of Organic Chemistry. ... The organic layer was separated and dried with anhydrous magnesium sulfate. ... 1 H NMR (300 MHz, MeOD): δ = 8.89 (s, 1 H, H ar ), 8.83 (s, 1 H, H ar ), 7.72 (t, 3 J H,H = 8.0 Hz, 1 H, H ar ), 7.62 (d, 3 J H,H = 8.3 Hz, 1 H, H ar ), 7.36 (d, 3 J ...