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1.  1,1′-Bis(4-fluoro­phen­yl)-3,3′-diisobutyl-4,4′-diphen­oxy-1H,1′H-4,4′-bipyrazole-5,5′(4H,4′H)-dione 
In the title compound, C38H36F2N4O4, the pyrazole rings form dihedral angles of 50.02 (4) and 18.05 (4)° with their attached fluorobenzene rings, and make dihedral angles of 76.08 (4) and 73.54 (5)° with the aromatic ring of the attached phen­oxy group. In the crystal, the molecules are connected by weak C—H⋯π inter­actions.
doi:10.1107/S1600536811011664
PMCID: PMC3089260  PMID: 21754364
2.  5-Ethyl-2-(4-fluoro­phen­yl)-4-phen­oxy-1H-pyrazol-3(2H)-one 
In the title compound, C17H15FN2O2, the essentially planar pyrazole ring [maximum deviation = 0.026 (1) Å] makes dihedral angles of 72.06 (7) and 33.05 (7)°, with the phenyl and fluoro­benzene rings, respectively. The dihedral angle between the two six-membered rings is 87.88 (7)°. In the crystal, inter­molecular N—H⋯O and C—H⋯F hydrogen bonds link the mol­ecules into layers lying parallel to the bc plane.
doi:10.1107/S1600536811000754
PMCID: PMC3051690  PMID: 21523133
3.  5-Ethyl-4-phenyl-1H-pyrazol-3(2H)-one 
The asymmetric unit of the title compound, C11H12N2O, consists of two crystallographically independent mol­ecules (A and B) with similar geometries. Both mol­ecules exist in a keto form, the C=O bond length being 1.286 (2) Å in A and 1.283 (2) Å in B. The dihedral angles between the pyrazole ring and the attached phenyl ring are 43.28 (12) and 46.88 (11)°, respectively, for A and B. The ethyl unit in mol­ecule B is disordered over two positions with a site-occupancy ratio of 0.508 (5):0.492 (5). In the crystal, each of the independent mol­ecules forms a centrosymmetric dimer with an R 2 2(8) ring motif through a pair of N—H⋯O hydrogen bonds. These dimers are further connected into a three-dimensional network by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds. Inter­molecular C—H⋯π inter­actions are also present.
doi:10.1107/S1600536811001589
PMCID: PMC3051742  PMID: 21523076
4.  1-{[5-(4-Chloro­phen­yl)-1-(4-fluoro­phen­yl)-1H-pyrazol-3-yl]carbon­yl]}piperidin-4-one 
In the title compound, C21H17ClFN3O2, the 1H-pyrazole ring makes dihedral angles of 36.73 (7), 18.73 (7) and 60.88 (8)°, respectively, with the mean planes of the chloro­phenyl, 4-oxo­piperidine and fluoro­phenyl rings. The mol­ecular structure is stabilized by an intra­molecular C—H⋯N hydrogen bond, which forms an S(6) ring motif. In the crystal, inter­molecular C—H⋯O hydrogen bonds link mol­ecules into chains along [101]. In addition, inter­molecular C—H⋯F hydrogen bonds with an R 2 1(7) ring motif connect neighbouring chains into layers parallel to the ac plane.
doi:10.1107/S1600536810047215
PMCID: PMC3011612  PMID: 21589523
5.  5-Isobutyl-4-phenyl­sulfonyl-1H-pyrazol-3(2H)-one 
The title compound, C13H16N2O3S, consists of two crystallographically independent mol­ecules with similar geometries and exists in a keto form, the C=O bond lengths being 1.267 (2) and 1.254 (2) Å. In both mol­ecules, the pyrazole rings are approximately planar, with maximum deviations of 0.017 (2) and 0.010 (2) Å, and the dihedral angles between the pyrazole and phenyl rings are 83.63 (11) and 70.07 (12)°. In one mol­ecule, an intra­molecular C—H⋯O hydrogen bond with an S(6) ring motif is observed. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into two-dimensional networks parallel to the ab plane.
doi:10.1107/S1600536810044181
PMCID: PMC3011737  PMID: 21589363
6.  1-(4-Fluoro­phen­yl)-3-methyl-4-phenyl­sulfanyl-1H-pyrazol-5(4H)-one 
The title compound, C16H13FN2OS, has undergone enol-to-keto tautomerism during the crystallization process. The 1H-pyrazole-5-one ring [maximum deviation = 0.0198 (11) Å] is inclined at angles of 33.10 (5) and 79.57 (5)° with respect to the fluoro­phenyl [maximum deviation = 0.0090 (12) Å] and phenyl­thiol [maximum deviation = 0.0229 (3) Å] rings attached to it. In the crystal, neighbouring mol­ecules are linked into inversion dimers, generating R 2 2(8) ring motifs. These dimers are further linked into two-dimensional arrays parallel to the bc plane via inter­molecular N—H⋯O, C—H⋯F and C—H⋯O hydrogen bonds. The crystal is further stabilized by weak π–π [centroid–centroid distance = 3.6921 (7) Å] and C—H⋯π inter­actions.
doi:10.1107/S1600536810040596
PMCID: PMC3009262  PMID: 21589006
7.  4-{[5-(4-Chloro­phen­yl)-1-(4-fluoro­phen­yl)-1H-pyrazol-3-yl]carbon­yl}-N-(4-cyano­phen­yl)piperazine-1-carboxamide 
In the title compound, C28H22ClFN6O2, the piperazine ring adopts a chair conformation and the least-squares plane through the four coplanar atoms forms dihedral angles of 69.37 (13) and 56.56 (12)°, respectively, with the pyrazole and cyano­phenyl rings. The dihedral angles formed between the pyrazole and the attached fluoro- and chloro­phenyl rings are 34.16 (10) and 73.27 (12)°, respectively. In the crystal, inter­molecular N—H⋯O, C—H⋯N and C—H⋯O hydrogen bonds link the mol­ecules into sheets parallel to the ac plane.
doi:10.1107/S1600536810036159
PMCID: PMC2983346  PMID: 21587549

Results 1-7 (7)