Deidaclin and Tetraphyllin A, Epimeric Glucosides of 2-Cyclopentenone Cyanohydrin, in Adenia globosa ssp. globosa Engl. (Passifloraceae). Crystal Structure of Deidaclin Tetraacetate.

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Abstract
Deidaclin and tetraphyllin A, epimeric glucosides of 2-cyclopentenone cyanohydrin, co-occur in the passifloraceous plant Adenia globosa ssp. globosa Engl. Absolute configurations of the cyanohydrin centres of the glucosides were determined by low-temperature crystallographic study of deidaclin tetraacetate, established to be (R)-1-(tetra-O-acetyl-.beta.-D-glucopyranosyloxy)-2-cyclopentenecarbonitrile. Co-occurrence of epimeric pairs of natural glucosides derived from 2-cyclopentenone cyanohydrin appears to be more common than hitherto known, and may be universal within this class of plant products.