Acetic Anhydride → 1,2,3,4-Tetra-O-acetyl-beta-D-xylopyranose

HRID 1372449Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1372449
[C:1]([O-:4])(=[O:3])[CH3:2].[Na+].C(O[C:10](=[O:12])[CH3:11])(=O)C.O=[CH:14][C@@H:15]([C@H:17]([C@@H:19]([CH2:21][OH:22])[OH:20])[OH:18])[OH:16]>>[C:1]([O:4][C@@H:21]1[O:22][CH2:14][C@@H:15]([O:16][C:10](=[O:12])[CH3:11])[C@H:17]([O:18][C:17](=[O:18])[CH3:19])[C@H:19]1[O:20][C:15](=[O:16])[CH3:14])(=[O:3])[CH3:2]

Komponenten

4

Edukt 3

HCID 7918Acetic AnhydrideHCID 517045Sodium AcetateHCID 644160aldehydo-D-Xylose

Produkt 1

HCID 28172551,2,3,4-Tetra-O-acetyl-beta-D-xylopyranose

Reaktionsbedingungen

Temperatur
130 °C

Versuchsvorschrift

A 200 mL round bottom flask containing sodium acetate (3.0 g) and acetic anhydride (36 mL) was heated to 130° C. on oil bath. When bubbles started to come out, D-xylose (5.0 g, 33.3 mmol) was added gradually. When bubbles did not come out any more, the flask was put away from the oil bath and cooled to room temperature. The reaction mixture was put in a 500 mL beaker containing ice (150 g), stirred for a while and then allowed to stand for 2 hours. The resultant light-brown precipitate was filtered by suction, washed with cold water and then dried by vacuum. The crude product was recrystallized using hot ethanol. The crystals were filtered by suction, washed with cold ethanol, and dried to give the title compound. White crystals. Yield 5.55 g, 53%.

Aufarbeitung

  1. temperaturecooled to room temperature
  2. filtrationThe resultant light-brown precipitate was filtered by suction
  3. washwashed with cold water
  4. customdried by vacuum
  5. customThe crude product was recrystallized
  6. filtrationThe crystals were filtered by suction
  7. washwashed with cold ethanol
  8. customdried

Quellen und Nachweise

ORD-Eintrag
ord-a93427b1a4124ba08f3f8329c749c6dc
Quelldatensatz
uspto-grants-2007_01
Patentnummer
US07157432B2

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