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artículo con referato
"On substituted pyrazole derivatives. II. (E)-1-(4-{[1-(4-Fluoro­phenyl)-3,5-di­methyl-1H-pyrazol-4-yl]diazenyl}phenyl)ethanone and (E)-1-(4-chloro­phenyl)-3,5-di­methyl-4-[2-(2-nitro­phenyl)diazenyl]-1H-pyrazole"
Carlos Bustos, Luis Alvarez-Thon, Tania Oportus, Angela Mesías-Salazar and Ricardo Baggio
Acta Cryst. C 71(1) (2015) 53-58
Abstract
The molecular structures of (E)-1-(4-{[1-(4-fluoro­phenyl)-3,5-dimethyl-1H-pyrazol-4-yl]diazenyl}phenyl)ethanone, C19H17FN4O, (III), and (E)-1-(4-chlorophenyl)-3,5-dimethyl-4-[2-(2-nitro­phenyl)diazenyl]-1H-pyrazole, C17H14ClN5O2, (IV), pre­pared by reaction of the corresponding β–diketo­hydrazones with substituted aryl­hydrazines in acid media, are nonplanar, with the planes of the lateral phenyl rings forming dihedral angles with that of the central pyrazole ring varying from 2.71 (7) to 45.22 (7)°. The crystal structures are supported by C–HO, C–Hπ and ππ weak intermolecular interactions together with some unusual trifurcated C–ClCl–C contacts, which are discussed in detail.
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