The title compound has a bi­cyclo­[2.2.2] structure with the P atom at the prow and the bridge-head C atom, with the bonded methyl group, at the stern. The three six-membered rings in the bi­cyclo­[2.2.2] structure have essentially identical good boat conformations.

In the title compound, the six-membered ring which includes the P atom has a chair conformation and three O atoms are bonded in a trigonal–pyramidal manner to the P atom. In the crystal, mol­ecules are linked via C—H⋯π inter­actions, forming slabs lying parallel to (10).