4-Methyl-1,7-diphenyl-1,6-heptadiene-3,5-dione → 4-Methyl-1,7-diphenylheptane-3,5-dione

HRID 714159Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 714159
[CH3:1][CH:2]([C:13](=[O:22])[CH:14]=[CH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[C:3](=[O:12])[CH:4]=[CH:5][C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1>[Pd].C(OCC)(=O)C>[CH3:1][CH:2]([C:3](=[O:12])[CH2:4][CH2:5][C:6]1[CH:7]=[CH:8][CH:9]=[CH:10][CH:11]=1)[C:13](=[O:22])[CH2:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Komponenten

4

Edukt 1

HCID 695017264-Methyl-1,7-diphenyl-1,6-heptadiene-3,5-dione

Produkt 1

HCID 695017724-Methyl-1,7-diphenylheptane-3,5-dioneAusbeute 73 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 23938PalladiumKatalysatorHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

4-Methyl-1,7-diphenyl-1,6-hetpadiene-3,5-dione (6b, 0.96 g, 3.3 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. The crude oil was twice chromatographed on silica gel with ethyl acetate/hexane to give an oil. The oil was distilled bulb to bulb to give 0.71 g (73%) of a clear oil; 1H NMR: δ enol form: 1.66 (s, 3H), 2.73 (m, 8H), 7.17 (m, 10H); keto form: 1.20 (d, 3H, J=7.2 Hz), 2.73 (m, 8H), 3.55 (q, 1H, J=7.0 Hz), 7.17 (m, 10H); 13C NMR: δ 12.3, 29.3, 31.0, 37.6, 42.8, 60.9, 104.2, 125.9, 128.1, 128.2, 140.4, 140.8, 174.6, 191.5, 205.6; Exact mass calcd for C20H22O2: 294.1620, observed (M+H) 295.1693.

Aufarbeitung

  1. customfor 2 hr
  2. customat room temperature
  3. filtrationThe resulting mixture was filtered through celite
  4. washthe filtrate was washed with saturated sodium chloride
  5. dry with materialdried over magnesium sulfate
  6. filtrationfiltered
  7. customevaporated
  8. customto afford an oil
  9. customThe crude oil was twice chromatographed on silica gel with ethyl acetate/hexane
  10. customto give an oil
  11. distillationThe oil was distilled bulb to bulb

Quellen und Nachweise

ORD-Eintrag
ord-5333404f7c1748e38f8ab1189533bda1
Quelldatensatz
uspto-grants-2015_11
Patentnummer
US09187397B2

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