Bis(2-pyridyl) ketone → 2-Heptenoic acid

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Prepared as above from 337.8 mg (0.86 mmol) of the pyridyl ketone and 742 mg (1.63 mmol) of the Wittig salt. Flash chromatography with MeOH-AcOH-CH2Cl2 (3:2:95) gave in ~92% yield a mixture of Wittig product (E/Z=~7.7:1) from which 326.5 mg (78%) of (E)-heptenoic acid was isolated cleanly: mp 61-64° C.; 1H NMR (CDCl3) δ8.57 (d, J=1.7 Hz, 1H), 8.47 (d, J=4.1 Hz, 1H), 8.28 (s, 1H), 8.05 (d, J=8.2 Hz, 2H), 7.52 (t, J=5.7 Hz, 1H), 7.45 (d, J=8.0 Hz, 1H), 7.25 (m, 5H), 6.94 (d, J=8.2 Hz, 2H), 6.94 (buried, 1H), 6.18 (t, J=7.4 Hz, 1H), 4.15 (t, J=5.0 Hz, 2H), 3.87 (dt, J=5.4, 5.3 Hz, 2H), 2.31 (dd, J=7.1, 6.7 Hz, 2H), 2.19 (ddd, J=7.3, 7.1, 6.9 Hz, 2H), 1.67-1.51 (m, 4H); FDMS 512 (M+1). Anal. (C30H29N3O5) C, H, N.

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