Formic Acid → 2,6-Bis[1-(4-allyl-2,6-diisopropylphenylimino)ethyl]pyridine

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A solution containing 2,6-diacetylpyridine (0.30 g, 1.84 mmol), 4-allyl-2,6-diisopropylaniline (0.80 g, 3.68 mmol), and formic acid (2 ml) in 30 ml dry methanol was refluxed under argon for 14 hours. Yellow solid was collected by filtration and washed with cold methanol (3×5 ml). Recrystallization from CH2Cl2:hexane (1:4) yielded 0.70 g (68%) of yellow, 2,6-bis[1-(4-allyl-2,6-diisopropylphenylimino)ethyl]pyridine crystals. IR (KBr): v(C═N) 1639 cm−1. 1H-NMR (CDCl3): 8.47(d, 2H, Py-Hm), 7.92(t, 1H, Py-Hp), 6.98(s, 4H, Ph-Hm), 6.04(m, 2H, CH═C), 5.12(m, 4H, C═CH2), 3.40(d, 4H, CH2—C═C), 2.75(m, 4H, CH(Me)2), 2.27(s, 6H, CH3), 1.15(d, 24H, C(CH3)2); 13C-NMR(CDCl3): 167.04(C═N), 155.15(Py-C), 144.57(Ph-C), 138.12(Ph-C), 136.79(Py-C), 135.69(Ph-C), 134.75(—CH═), 123.16(Py-C), 122.12(Ph-C), 115.34(═CH2), 40.25(—CH2—), 28.31(C(Me)2), 23.24(CH3), 22.92(CH3), 17.14(CH3). C39H51N3 (561.86 g·mol-1): Anal. Calcd: C, 83.37; H, 9.15; N, 7.48. Found: C, 83.03; H, 9.13; N, 7.55.

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