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In the title compound, C 19 H 17 N 2 O 3 P, the six-membered 1,3,2-oxaza­phospho­rine ring adopts a twist-boat conformation with the phosphoryl O atom in an equatorial position. The P=O(oxide) bond length is 1.457 (1) Å and the average value of the P—O distances is 1.588 Å. The crystal structure is stabilized by C—H⋯O and C—H⋯π inter­actions.

3-(6-Methyl-2-pyridyl)-2-phenoxy-3,4-dihydro-1,3,2-benzoxazaphosphirine 2-oxide