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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.

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Sydnones, which contain a mesoionic five-membered heterocyclic ring, are more stable if synthesized with an aromatic substutuent at the N3 position. In the title compound {sys­tematic name: 4-acetyl-3-[2-(eth­oxy­carbon­yl)phen­yl]-1,2,3-oxa­diazol-3-ylium-5-olate}, C13H12N2O5, the aromatic substitutent is 2-(eth­oxy­carbon­yl)phenyl. Intra- and inter­molecular hydrogen bonds are observed. The inter­planar angle between the sydnone and benzene rings is 71.94 (8)°. π-ring...carbon­yl inter­actions of 3.2038 (16) Å arise between the sydnone ring and a symmetry-related C=O group.
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