Key indicatorsSingle-crystal X-ray study T = 190 K Mean '(C±C) = 0.003 A Ê R factor = 0.033 wR factor = 0.073 Data-to-parameter ratio = 10.0 For details of how these key indicators were automatically derived from the article, see
The title compound, C20H25NO4, the product formed in the Amadori rearrangement of l‐rhamnose with dibenzylamine, is shown by X‐ray crystallographic analysis to be a rare example of an Amadori product crystallizing in a furanose form.
A second crystalline diacetonide, the title compound, C13H20O7, has been isolated from the sequential treatment of d‐tagatose with aqueous sodium cyanide, followed by acetone in the presence of acid. Structural ambiguities with regard to the size of both the lactone and ketal rings are resolved by the X‐ray crystallographic analysis.
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