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.beta.-D-Galactopyranose

.beta.-D-Galactopyranose Structure
.beta.-D-Galactopyranose
  • CAS No.7296-64-2
  • Chemical Name:.beta.-D-Galactopyranose
  • CBNumber:CB31208989
  • Molecular Formula:C6H12O6
  • Formula Weight:180.16
  • MOL File:7296-64-2.mol
.beta.-D-Galactopyranose Property
  • Melting point 179-179.5 °C
  • Boiling point 410.8±45.0 °C(Predicted)
  • Density 1.732±0.06 g/cm3(Predicted)
  • storage temp. Hygroscopic, Refrigerator, under inert atmosphere
  • solubility Water (Slightly)
  • form Solid
  • pka 12.12±0.70(Predicted)
  • color White to Off-White
  • Stability Hygroscopic
  • FDA UNII RQ6K52J67A
Hazard and Precautionary Statements (GHS)
  • Symbol(GHS)
  • Signal word
  • Hazard statements
  • Precautionary statements

.beta.-D-Galactopyranose Chemical Properties,Usage,Production

  • Uses β-D-Galactose s the beta anomer of D-Galactose (G155250), the C-4 epimer of Glucose (G595000). D-Galactose is found in milk and sugar beets as well as being synthesized by the body.
  • Definition ChEBI: A D-galactopyranose having beta-configuration at the anomeric centre.
  • Purification Methods D-Galactose (40g) is dissolved in hot H2O to establish the equilibrium of and anomers; then the solution is cooled to 0o and poured into absolute EtOH (500mL). Stir vigorously and crystallisation occurs within a few minutes, and more rapidly if seeded, filter the crystals immediately (7g, [] D 20 +65o (initial, c 4 in H2O). This mixture of and anomers is further separated by dissolving in an equal weight of cold H2O, filtering and adding to ice cold absolute EtOH (250mL) and stirring for 1minute when crystals separate, then filter them off. After two such crystallisations, the initial [] D 20 is +53o. This can be further purified by shaking with 80% EtOH for 2minutes, filtering, washing with EtOH and Et2O, and drying in a vacuum desiccator to give -Dgalactose (15g) with m 167o, [ ] D 20 +52o (initial, c 4 in H2O) mutarotating to +80.4o. Acetylation of Dgalactose with hot NaOAc/Ac2O gives -D-galactopyranoside pentaacetate m 1 4 2o, [ ] D 25 +25 (c 4 in CHCl3). [Wolfrom & Thompson Methods in Carbohydrate Chemistry I 120 1962, Academic Press, Beilstein 1 IV 4336.]
.beta.-D-Galactopyranose Preparation Products And Raw materials
Raw materials
Preparation Products
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.beta.-D-Galactopyranose Spectrum
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