The planar title compound 4,5-dimethyl-1,3-dioxol-2-one, CHO, , crystallizes with its mol-ecular axis coincident with a crystallographic mirror plane in space group 2/. In the plane defined by the axis and an face diagonal, anti-parallel linear strands of , formed by simple translation, associate to form sheets with close H⋯H and O⋯O inter-molecular contacts. Between the sheets, parallel strands of place the carbonyl O atom near the five-membered ring centroid of a neighboring mol-ecule with close O⋯O and O⋯C contacts.
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