Fischer3 was the first to describe a definite condensation product from the interaction of glycerol with benzaldehyde and the molecular structure of the cyclic acetal formed was represented as being

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ACYL t JO-UREAS 3177 specific rotational values of these halogen derivatives shows that these straight chain biose derivatives behave the same as the branched chain biose derivatives investigated in the previous article, as agreement with the regular relationship observed for the corresponding derivatives of the monose sugars is obtained only by excluding the values for the fluoro derivatives.Besides the pure -halogen derivatives of gentiobiose, impure ß-chloro and iodo compounds were obtained.The Walden inversion from ß-octa-acetylgentiobiose to -chloroand iodo-hepta-acetyl gentiobiose by the action of hydrochloric and hydriodic acids proceeds at least in two definite steps, ß-chloro-or iodo-hepta-acetylgentiobiose being intermediately formed.