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

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Prepared as above from 165.4 mg (0.44 mmol) of the pyridyl ketone and 395.6 mg (0.87 mmol) of the Wittig salt. Preparative HPLC with MeOH-AcOH-CH2Cl2 (2:1:97) furnished 94.8 mg (46%) of the pure (E)-heptenoic acid: mp 67-72° C.; 1H NMR (CDCl3) δ8.60 (s, 1H), 8.48 (br s, 1H), 8.25 (s, 1H), 8.05 (d, J=8.2 Hz, 2H), 7.62 (distorted t, J=~5.3 Hz, 1H), 7.43 (br d, J=7.8 Hz, 1H), 7.28 (buried, 1H), 7.26 (d, 2H), 6.22 (t, J=7.4 Hz, 1H), 3.50 (m, 6H), 2.30 (ddd, J=7.1, 7.1, 6.9 Hz, 2H), 2.20 (ddd, J=7.6, 7.2, 6.9 Hz, 2H), 1.90 (tt, J=6.1, 6.1 Hz, 2H), 1.64-1.54 (m, 4H), 1.28 (t, J=7.0 Hz, 3H); FDMS 478 (M+1). Anal. (C27H31N3O5.0.6CH4O.0.8H2O) C, H, N.

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