Abstract
When crystalline 1,6-anhydrohexopyranoses are heated, they all undergo closely similar, first-order transitions in the solid phase; these transitions are accompanied by major changes in the entropy and heat capacity of the compounds. The high-temperature phase has a very low entropy of fusion, and can be classified as a plastic crystal. With levoglucosan it has been shown that the transition is accompanied by softening of the crystal and changes in the i.r. and broad-line n.m.r. spectra that indicate a decrease in hydrogen bonding and increased molecular motion. The nature of these transformations is discussed in the light of the information available from other examples of phase transition to plastic crystal.
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