organic compounds
Open access
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—HO=C hydrogen bonds.
organic compounds
Open access
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-ringcarbonyl interactions of 3.2038 (16) Å arise between the sydnone ring and a symmetry-related C=O group.