α-Haloketal (1′R,4S,5S)-dimethyl 2-(1′-bromoethyl)-2-(3,4-dimethoxyphenyl)-1,3-dioxolane-4,5-dicarboxylate

The crystal structure and absolute configuration of the title compound, C₁₇H₂₁BrO₈, have been determined by X-ray analysis. They confirmed the 1′R absolute configuration at the 1′-bromoethyl moiety which has been assigned previously on the basis of chemical and spectroscopic data. Cohesion of the crystal can be attributed to weak intermolecular C—H⋯O and van der Waals interactions.