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author:("jadera, R. N.")
1.  Crystal structure of (4Z)-1-(3,4-di­chloro­phen­yl)-4-[hy­droxy(4-methyl­phen­yl)methyl­idene]-3-methyl-4,5-di­hydro-1H-pyrazol-5-one 
The title compound, C18H14Cl2N2O2, crystallizes with two mol­ecules, A and B, in the asymmetric unit. In mol­ecule A, the dihedral angles between the central pyrazole ring and pendant di­chloro­benzene and p-tolyl rings are 2.18 (16) and 46.78 (16)°, respectively. In mol­ecule B, the equivalent angles are 27.45 (16) and 40.45 (18)°, respectively. Each mol­ecule features an intra­molecular O—H⋯O hydrogen bond, which closes an S(6) ring and mol­ecule A also features a C—H⋯O inter­action. In the crystal, weak C—H⋯π interactions and aromatic π–π stacking [shortest centroid–centroid separation = 3.707 (2) Å] generate a three-dimensional network.
doi:10.1107/S160053681402114X
PMCID: PMC4257223  PMID: 25484715
crystal structure; Schiff-base pyrazole derivative; hydrogen bonding; C—H⋯π inter­actions; aromatic π–π stacking
2.  Crystal structure of (Z)-1-(3,4-dichlorophenyl)-3-methyl-4-[(naphthalen-1-yl­amino)(p-tolyl)methylidene]-1H-pyrazol-5(4H)-one 
The title Schiff base compound, C28H21Cl2N3O, was synthesized by the condensation of 1-(3,4-di­chloro­phen­yl)-3-methyl-4-(4-methyl­benzo­yl)-1H-pyrazol-5(4H)-one with 1-aminona­phthalene. The p-tolyl ring is normal to the pyrazole ring, with a dihedral angle of 88.02 (14)°, and inclined to the naphthalene ring system by 78.60 (12)°. The pyrazole ring is inclined to the naphthalene ring system and the di­chloro-substituted benzene ring by 63.30 (12) and 11.03 (13)°, respectively. The amino group and carbonyl oxygen atom are involved in an intra­molecular N—H⋯O hydrogen bond enclosing an S(6) ring motif. There is also a short C—H⋯O contact involving the carbonyl O atom and the adjacent benzene ring. In the crystal, mol­ecules are linked by C—H⋯π inter­actions, forming a three-dimensional structure.
doi:10.1107/S1600536814017140
PMCID: PMC4186144  PMID: 25309277
crystal structure; Schiff base; naphthalene; pyrazolone; pyrrole
3.  (Z)-3-Methyl-4-[1-(4-methyl­anilino)propyl­idene]-1-phenyl-1H-pyrazol-5(4H)-one 
In the title mol­ecule, C20H21N3O, the central pyrazole ring forms dihedral angles of 4.75 (9) and 49.11 (9)°, respectively, with the phenyl and methyl-substituted benzene rings. The dihedral angle between the phenyl and benzene rings is 51.76 (8)°. The amino group and carbonyl O atom are involved in an intra­molecular N—H⋯O hydrogen bond. In the crystal, π–π inter­actions are observed between benzene rings [centroid–centroid seperation = 3.892 (2) Å] and pyrazole rings [centroid–centroid seperation = 3.626 (2) Å], forming chains along [111]. The H atoms of the methyl group on the p-tolyl substituent were refined as disordered over two sets of sites in a 0.60 (4):0.40 (4) ratio.
doi:10.1107/S1600536813019144
PMCID: PMC3793766  PMID: 24109353
4.  (Z)-3-Methyl-1-phenyl-4-[(p-tol­yl)(p-tolyl­amino)­methyl­idene]-1H-pyrazol-5(4H)-one 
In the title mol­ecule, C25H23N3O2, the pyrazole ring forms dihedral angles of 28.56 (7), 80.35 (7) and 31.99 (7)° with the phenyl ring, the p-tolyl ring and the p-tolyl­amino ring, respectively. The N—H group attached to the exocyclic C=C bond is in a syn arrangement with respect to the C=O bond of the pyrazolone group and an intra­molecular N—H⋯O hydrogen bond is observed. In the crystal, weak C—H⋯π inter­actions link mol­ecules along [100].
doi:10.1107/S1600536812040330
PMCID: PMC3470389  PMID: 23125802

Results 1-4 (4)