α-D,l-Sorbose

摘要

The racemic title compound, C 6 H 12 O 6 , consisting of C-4 epimers of psicose, was crystallized from an aqueous solution of an equimolar mixture of D - and L -sorboses. It was confirmed that D -sorbose (or L -sorbose) formed α -pyran-ose with a 4 C 1 (or 1 C 4 ) conformation where the anomer position was designated as carbon-1. The asymmetric unit comprises two crystallographically independent mol-ecules. In the crystal, mol-ecules are linked by O—H?O hydrogen bonds, forming a three-dimensional framework. The unit-cell volume of the title racemic α - D , L -sorbose is 1450.86?(6)?? 3 ( Z = 8), which is about 41?? 3 smaller than that of twice the amount of chiral α - L -sorbose [ V = 745.942?? 3 ( Z = 4)].