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The five-membered ring in the title compound, C 6 H 13 O 3 P, exists in an envelope conformation with one of the ring C atoms at the flap position. The coordination geometry around the P atom is a distorted tetra­hedron. The crystal structure is stabilized by several weak C—H⋯O and P—H⋯O hydrogen bonds, forming a three-dimensional network.

4,4,5,5-Tetramethyl-1,3,2λ5-dioxaphospholan-2-one

4,4,5,5-Tetramethyl-1,3,2λ⁵-dioxaphospholan-2-one