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

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 α-D-furanose ring cis-fused with a dioxolane ring as well as a δ-lactone ring, exhibits a twisted conformation. The CCl3 group has an axial orientation. The furanose ring approximates an envelope conformation due to the α,β-unsaturated lactone functionality. The asymmetric unit contains two independent molecules with almost identical geometries.