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4. Selected characterisation data. Compound 4: m.p. 197–200°C; δH (300 MHz, CDCl3) 1.4–1.8 (8H, m), 2.40 (2H, d, J 6.3 Hz, pyridine-H2,6), 2.92 (2H, t, J 5.6 Hz), 3.49 (2H, s), 3.87 (2H, t, J 7.6 Hz), 5.48 (2H, d, J 6.3 Hz, pyridine-H3,5), 7.23 (1H, m), 7.55–7.75 (11H, m), 8.12–8.28 (7H, m), 8.8–8.9 (8H, m); acc. mass (FAB) found 884.3036 (M+H), C56H46N5O2Zn=884.2943. Compound 5: m.p. >290°C; δH (300 MHz, CDCl3) 3.98 (3H, s), 7.33 (1H, dd, J 8.2 Hz, 2.6 Hz), 7.64 (1H, t, J 7.4 Hz), 7.72–7.84 (11H, m), 8.20–8.26 (6H, m), 8.94–9.02 (8H, m); acc. mass (FAB) found 707.1812 (M+H), C45H31N4OZn=707.1789.
5. Whitten, D. G.; Lopp, I. G.; Wildes, P. D. J. Am. Chem. Soc. 1968, 90, 7196–7200.