Hexane → 4-Benzyl-1,7-diphenylheptane-3,5-dione

Participants

Reaction Steps

4-Benzyl-1,7-diphenyl-1,6-heptadiene-3,5-dione (9b, 0.26 g, 0.7 mmol) and palladium on activated carbon (0.25 g, 10%) were combined in ethyl acetate (50 ml). The mixture was placed under a hydrogen atmosphere (60 psi) on a Parr apparatus for 2 hr at room temperature. The resulting mixture was filtered through celite and the filtrate was washed with saturated sodium chloride, dried over magnesium sulfate, filtered and evaporated to afford an oil. Hexane was added to the crude oil and the resulting precipitate was filtered. The crude solid was recrystallized twice from hexane to give 0.18 g (69%) of white needles: mp 74-75° C.; 1H NMR: δ enol form: 2.61 (m, 10H), 7.14 (m, 15H); keto form: 2.61 (m, 8H), 3.07 (d, 2H, J=7.2 Hz), 3.90 (t, 1H, J=7.6 Hz), 7.14 (m, 15H); 13C NMR: δ 29.3, 34.3, 44.3, 69.2, 126.1, 126.7, 128.3, 128.4, 128.6, 128.7, 137.9, 140.4, 204.3; Exact mass calcd for C26H26O2: 370.1933, observed (M+H) 371.2014.

Provenance & Evidence