3-{5-Bromo-2-[(tri­phenyl­phosphanyl­idene)amino]­phen­yl}-4,5-di­hydro-1,2,3-oxa­diazol-3-ylium-5-olate

In general, sydnone compounds are synthesized with an aromatic substituent at the N-3 position and this feature adds to the stability of the mesoionic five-membered heterocyclic ring. In the title compound, C₂₆H₁₉BrN₃O₂P, the aromatic substitutent is tri­phenyl­phosphine 4-bromo­phenyl­imide. The dihedral angle between the planes of the sydnone and the attached phenyl ring is 45.98 (7)°. In the crystal, the mol­ecules packed as pairs in which the sydnone rings lie in parallel planes separated by 0.849 Å and sandwiched between two parallel phenyl rings. The mol­ecules inter­act through cyclic C—H...O=C hydrogen bonds.