Optical rotatory data for a number of previously reported as well as new pentose derivatives are tabulated. Comparisons among these rotations lead to certain generalizations, especially regarding the relationship of the rotations of the pentose derivatives with those of the corresponding anhydropentitol derivatives. No anomalies are shown by those derivatives of 2-deoxy-o-erythro-pentose considered here. Based on rotatory considerations, evidence for the anomeric configuration of a number of pentose derivatives is discussed.
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