Ethanol → Ethyl 7-methoxy-9-oxoxanthene-2-carboxylate

HRID 435999

Reaktionsgleichung

Reaktionsgleichung von HRID 435999
[CH3:1][O:2][C:3]1[CH:16]=[C:15]2[C:6]([O:7][C:8]3[CH:9]=[CH:10][C:11]([C:18]([OH:20])=[O:19])=[CH:12][C:13]=3[C:14]2=[O:17])=[CH:5][CH:4]=1.[CH2:21](O)[CH3:22]>S(=O)(=O)(O)O>[CH3:1][O:2][C:3]1[CH:16]=[C:15]2[C:6]([O:7][C:8]3[CH:9]=[CH:10][C:11]([C:18]([O:20][CH2:21][CH3:22])=[O:19])=[CH:12][C:13]=3[C:14]2=[O:17])=[CH:5][CH:4]=1

Komponenten

4

Edukt 2

HCID 702EthanolHCID 1931602-Carboxy-7-methoxyxanthen-9-one

Produkt 1

HCID 21455094Ethyl 7-methoxy-9-oxoxanthene-2-carboxylateAusbeute 84 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1118Sulfuric AcidLösungsmittel

Versuchsvorschrift

A mixture of 7-methoxy-9-oxoxanthene-2-carboxylic acid in ethanol (100ml) and concentrated sulfuric acid (10 ml) was refluxed under nitrogen for 24 hours. The reaction mixture was concentrated and cooled. The product, which precipitated, was filtered off and recrystallized from ethanol to give white crystals (2.53g, 84%), mp. 170°-172° C.

Aufarbeitung

  1. temperaturewas refluxed under nitrogen for 24 hours
  2. concentrationThe reaction mixture was concentrated
  3. temperaturecooled
  4. customThe product, which precipitated
  5. filtrationwas filtered off
  6. customrecrystallized from ethanol

Quellen und Nachweise

ORD-Eintrag
ord-675d50573a774e7fad237b71e5dc3df1
Quelldatensatz
uspto-grants-1977_02
Patentnummer
US04007205

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