2,2'-Methylenebis(5,5-dimethyl-1,3,2-dioxaphosphorinane 2-oxide)

The title complex, C₁₁H₂₂O₆P₂, contains two tetrahedral P(^V) atoms connected by a bridging methylene group. The two P=O vectors are rotated away from each other, with an O-P-P-O torsion angle of -135.1 (1)°. Each P atom is contained in a six-membered ring with two O and three C atoms. The six-membered rings are in chair conformations, with the O atom of the P=O moiety in an equatorial position.