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organic compounds
The title compound, C21H28O8, crystallizes with two independent molecules, each with a crystallographic twofold axis passing through the central CH2 group. The two molecules have different orientations of the terminal benzyl groups. The average C—O bond length in the polyoxymethylene helix, corrected for librational motion, is 1.419 Å. The molecules are connected into layers by intermolecular C—H
O and C—Hπ(phenyl) interactions.
O and C—Hπ(phenyl) interactions.organic compounds
The structure of the title compound, C14H18O5, has two independent molecules related by a local noncrystallographic a-glide plane perpendicular to the b axis. The pseudo-glide plane shows a discontinuity at z = 0. Both molecules have an intramolecular hydrogen bond between the hydroxy and aldehyde groups. There are stacks of molecules along the a-axis direction. Neighboring molecules in the stack have an interplanar angle of 1.6 (1)°, interplanar distances ranging between 3.399 (3) and 3.417 (3) Å, and a ring offset of 1.38 (1) Å.
