Hydroquinone → Potassium dobesilate

HRID 587811

Reaktionsgleichung

Reaktionsgleichung von HRID 587811
[C:1]1([CH:8]=[CH:7][C:5]([OH:6])=[CH:4][CH:3]=1)[OH:2].[S:9](=O)(=[O:12])([OH:11])[OH:10].C(C(CCCC)C([O-])=O)C.[K+:24]>C(OCC)(=O)C>[K+:24].[OH:2][C:1]1[CH:8]=[CH:7][C:5]([OH:6])=[CH:4][C:3]=1[S:9]([O-:12])(=[O:11])=[O:10]

Komponenten

5

Edukt 3

HCID 785HydroquinoneHCID 1118Sulfuric AcidHCID 23669619Potassium 2-ethylhexanoate

Produkt 1

HCID 23672329Potassium dobesilateAusbeute 77,9 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8857Ethyl AcetateLösungsmittel2×

Reaktionsbedingungen

Temperatur
12.5 °C

Versuchsvorschrift

Hydroquinone (10 g, 0.09 mol) was taken in a round bottom flask, after cooling the flask to about 10-15° C., sulfuric acid (36 N, 8.9 g) was added dropwise at the same temperature and stirring continued further for about 10-15 min. Temperature was slowly raised to 50-60° C. then stirred for 3-8 h. The reaction mass was then cooled to 25-35° C. and ethyl acetate (100 mL) added to dissolve the solid formed. A solution of potassium 2-ethylhexanoate (18.2 g, 0.099 mol) in ethyl acetate (100 mL) was added slowly. The reaction was further stirred for an hour. The precipitated crude solid was filtered, washed with ethyl acetate to give 16 g of 2,5-dihydroxybenzenesulfonic acid potassium salt.

Aufarbeitung

  1. temperatureTemperature was slowly raised to 50-60° C.
  2. stirringthen stirred for 3-8 h
  3. temperatureThe reaction mass was then cooled to 25-35° C.
  4. dissolutionto dissolve the solid
  5. customformed
  6. stirringThe reaction was further stirred for an hour
  7. customThe precipitated crude solid
  8. filtrationwas filtered
  9. washwashed with ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-a1d51e9620bc4d46b9702780e94cd91b
Quelldatensatz
uspto-grants-2016_01
Patentnummer
US09227928B2

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