The title compound crystallises in the monoclinic space group, Cc, Z = 4, with a = 12.370(1), b = 19.447(1), c = 7.786(1) Å, β = 90.82(1)°. The structure was solved by direct methods and refined to R = 0.070 for 2163 independent reflections. Trigonal-bipyramidal geometry is observed at phosphorus with the ring oxygens occupying the axial sites. The plane of the phenyl substituent makes a dihedral angle of 20.2° with the equatorial plane. The molecules are linked into infinite chains in the

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... plane through (CH2)O ••• H—O(CH2) hydrogen bonds of length 2.77 A.