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The title compound, C 15 H 28 O 4 , was prepared by the condensation of pivalaldehyde with penta­erythritol. In the crystal, the two halves of the mol­ecule are related by a crystallographic twofold rotation axis passing through the central spiro-C atom. The two non-planar six-membered heterocycles both adopt chair conformations with the two  tert -butyl groups both located in the equatorial positions.

3,9-Di-tert-butyl-2,4,8,10-tetraoxaspiro[5.5]undecane