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Four 1-aryl-1H-pyrazole-3,4-dicarboxylate derivatives: synthesis, molecular conformation and hydrogen bonding
Four 1-aryl-1H-pyrazole-3,4-dicarboxylate derivatives, one acid, two esters and a dicarbohydrazide have been synthesized starting from 3-aryl sydnones, and structurally characterized. There is an intramolecular O—H⋯O hydrogen bond in 1-phenyl-1H-pyrazole-3,4-dicarboxylic acid, C(11)H(8)N(2)O(4...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6281123/ https://www.ncbi.nlm.nih.gov/pubmed/30574374 http://dx.doi.org/10.1107/S2056989018015864 |
Sumario: | Four 1-aryl-1H-pyrazole-3,4-dicarboxylate derivatives, one acid, two esters and a dicarbohydrazide have been synthesized starting from 3-aryl sydnones, and structurally characterized. There is an intramolecular O—H⋯O hydrogen bond in 1-phenyl-1H-pyrazole-3,4-dicarboxylic acid, C(11)H(8)N(2)O(4), (I), and the molecules are linked into a three-dimensional framework structure by a combination of O—H⋯O, O—H⋯N, C—H⋯O and C—H⋯π(arene) hydrogen bonds. In each of the two esters dimethyl 1-phenyl-1H-pyrazole-3,4-dicarboxylate, C(13)H(12)N(2)O(4), (II), and dimethyl 1-(4-methylphenyl)-1H-pyrazole-3,4-dicarboxylate, C(14)H(14)N(2)O(4), (III), C—H⋯O hydrogen bonds lead to the formation of cyclic centrosymmetric dimers: in (III), one of the methoxycarbonyl groups is disordered over two sets of atomic sites having occupancies 0.71 (2) and 0.29 (2). An intramolecular N—H⋯O hydrogen bond is present in the structure of 1-(4-methoxyphenyl)-1H-pyrazole-3,4-dicarbohydrazide, C(12)H(14)N(6)O(3), (IV), and the molecules are linked into a three-dimensional framework structure by a combination of N—H⋯O, N—H⋯N, N—H⋯π(arene) and C—H⋯O hydrogen bonds. Comparisons are made with the structures of a number of related compounds. |
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