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Characterization of the title compound, C15H16O5, by X-ray diffraction affirms its linearly fused tricyclic structure and the chair conformation of the cyclohexane ring on which the methyl and adjacent formyloxy groups are cis, the former being axial and the latter equatorial. The C=C bond γ,δ to the carbonyl is longer while the C=C bond α,β to the carbonyl is shorter than their counterparts in a 3-substituted 4-hydroxy-6-methyl-2-pyrone.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, default

hkl

Structure factor file (CIF format)
Contains datablock shelxl

CCDC reference: 129299

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