2',4'-Dihydroxyacetophenone → 7-Hydroxy-4-benzopyrone

HRID 333038

Reaktionsgleichung

Reaktionsgleichung von HRID 333038
[OH:1][C:2]1[CH:7]=[C:6]([OH:8])[CH:5]=[CH:4][C:3]=1[C:9](=[O:11])[CH3:10].[CH:12](OCC)(OCC)OCC.Cl(O)(=O)(=O)=O>CCOCC>[OH:8][C:6]1[CH:7]=[C:2]2[C:3]([C:9](=[O:11])[CH:10]=[CH:12][O:1]2)=[CH:4][CH:5]=1

Komponenten

5

Edukt 3

HCID 69902',4'-DihydroxyacetophenoneHCID 24247Perchloric AcidHCID 31214Ethyl orthoformate

Produkt 1

HCID 54092797-Hydroxy-4-benzopyroneAusbeute 53,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 3283Diethyl EtherLösungsmittel

Versuchsvorschrift

To a round bottomed flask, 0.26 mol of 2′,4′-dihydroxyacetophenone was added and mixed thoroughly with 232 mL of triethyl orthoformate. Then 26.4 mL of perchloric acid was dropped slowly into the resultant mixture. After 30 min reaction, 300 mL ether was added, and solids were precipitated. Following sucking filtration, the dried solids were transferred into a 1000 mL round bottomed flask, and refluxed for 2 hours after 250 mL hot water was added. Sucking filtration was conducted again, and then 22.69 g of 7-hydroxychromone was obtained by recrystallization with ethanol, with a yield of 53.2% and MS m/z (M)162.

Aufarbeitung

  1. additionwas added
  2. customsolids were precipitated
  3. filtrationfiltration
  4. customthe dried solids were transferred into a 1000 mL round bottomed flask
  5. temperaturerefluxed for 2 hours after 250 mL hot water
  6. additionwas added
  7. filtrationSucking filtration

Quellen und Nachweise

ORD-Eintrag
ord-34c7645a78fd4fd8bd6cdfc84e744fcc
Quelldatensatz
uspto-grants-2014_11
Patentnummer
US08877949B2

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