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Crystalline 3- O - α -d-glucopyranosyl- α -d-arabinopyranose monohydrate, mp 120 to 121 °C, and 3- O - α -d-gluecopyranosyl- β -d-arabinopyranose, mp 155 to 157 °C, were prepared from a sirup obtained by the Ruff degradation of calcium maltobionate. For the alpha monohydrate,[  α  ]   D   20    =  +  16.7  ×    10    -  0.024  t    -  9.6  ×    10    -  0.098  t    +  46.6   , and for the anhydrous beta form,[  α  ]   D   20    =  -  25.6  ×    10    -  0.025  t    -  9.4  ×    10    -  0.097  t    +  49.2   . The structure of the sugar was established by converting it into maltose. Treatment of the alpha form with pyridine-acetic anhydride gave a heptaacetate, mp 127 to 128 °C,[  α  ]   D   20    +    62.4   °    ( c 2.5, chloroform). The beta form gave a heptaacetate, mp 194.5-195.5° C,[  α  ]   D   20    +    13.4   °    ( c 2.5, chloroform).

Crystalline alpha and beta forms of 3-O-a-D-glucopyranosyl-D-arabinopyranose