Acta Cryst. (2008). E64, o1784  [ doi:10.1107/S1600536808026196 ]

(R)-3,4,5-Trideoxy-5,6-didehydro-1,2-O-(2,2,2-trichloroethylidene)--D-glucofuranose-6,3-carbolactone: a new derivative of -chloralose

V. Aburto-Luna, R.-L. Meza-León and S. Bernès

Abstract: The title compound [systematic name: (R)-2-trichloromethyl-3a,3b,7a,8a-tetrahydro-5H-pyrano[2',3':4,5]furano[2,3-d][1,3]dioxol-5-one], C₉H₇Cl₃O₅, a triyclic system that contains a central -D-furanose ring cis-fused with a dioxolane ring as well as a -lactone ring, exhibits a twisted conformation. The CCl₃ group has an axial orientation. The furanose ring approximates an envelope conformation due to the ,-unsaturated lactone functionality. The asymmetric unit contains two independent molecules with almost identical geometries.

Online 20 August 2008

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