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1.  (Z)-4-[2-(2,4-Dimethyl­phen­yl)hydrazinyl­idene]-3-methyl­pyrazol-5(1H)-one 
The mol­ecule of the title compound, C12H14N4O, is roughly planar, with a dihedral angle of 8.0 (8)° between the benzene and pyrazole rings, and an intra­molecular N—H⋯O hydrogen bond forms an S(6) ring motif. In the crystal, mol­ecules are linked into an inversion dimer by a pair of N—H⋯O hydrogen bonds, which form an R 2 2(8) ring motif.
doi:10.1107/S1600536813006661
PMCID: PMC3629586  PMID: 23634073
2.  Ethyl 6-(4-meth­oxy­phen­yl)-2-oxo-4-phenyl­cyclo­hex-3-ene­carboxyl­ate 
The asymmetric unit of the title compound, C22H22O4, consists of two independent mol­ecules (A and B). The cyclo­hexene rings adopt slightly distorted sofa conformations in both mol­ecules. The dihedral angles between the benzene rings are 74.16 (13) and 71.85 (13)° in mol­ecules A and B, respectively. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into a ribbon-like structure along the b axis. Weak C—H⋯π inter­actions are also observed.
doi:10.1107/S1600536812036446
PMCID: PMC3435819  PMID: 22969665
3.  1-(6-Chloro-1,3-benzothia­zol-2-yl)-2-[1-(4-meth­oxy­phen­yl)ethyl­idene]hydrazine 
The asymmetric unit of the title compound, C16H14ClN3OS, contains two independent mol­ecules (A and B) linked into dimers via N—H⋯N hydrogen bonds. The 1,3-benzothia­zol-2-yl ring system and the benzene ring form dihedral angles of 17.08 (8) and 8.63 (7)° in mol­ecules A and B, respectively.
doi:10.1107/S1600536812032606
PMCID: PMC3435704  PMID: 22969575
4.  1-(5-Chloro-6-fluoro-1,3-benzothia­zol-2-yl)hydrazine 
In the title compound, C7H5ClFN3S, the 1,3-benzothia­zole ring system is nearly planar (r.m.s. deviation = 0.023 Å). In the crystal, mol­ecules are linked via inter­molecular N—H⋯N hydrogen bonds into a two-dimensional network parallel to (100).
doi:10.1107/S160053681203156X
PMCID: PMC3414915  PMID: 22904902
5.  1-[2,6-Dichloro-4-(trifluoro­meth­yl)phen­yl]-3,4-dimethyl­pyrano[2,3-c]pyrazol-6(1H)-one 
In the title compound, C15H9Cl2F3N2O2, the 1,6-dihydro­pyrano[2,3-c]pyrazole ring system is almost planar, with a maximum deviation of 0.0226 (14) Å, and forms a dihedral angle of 69.90 (6)° with the benzene ring. In the crystal, mol­ecules are linked into a helical chain along the c axis by C—H⋯O hydrogen bonds.
doi:10.1107/S1600536812029789
PMCID: PMC3414285  PMID: 22904818
6.  1-(6-Chloro-1,3-benzothia­zol-2-yl)hydrazine 
The asymmetric unit of the title compound, C7H6ClN3S, consists of two crystallographically independent mol­ecules (A and B). The dihedral angle between the benzothia­zole ring system and the hydrazine group is 8.71 (6)° in mol­ecule A and 7.16 (6)° in mol­ecule B. The N—N—C—N and N—N—C—S torsion angles involving the hydrazine group are 170.89 (9) and −9.96 (13)°, respectively, in mol­ecule A and 172.50 (9) and −7.43 (13)°, respectively, in mol­ecule B. In the crystal, neighbouring mol­ecules are connected via pairs of N—H⋯N hydrogen bonds, generating R 2 2(8) ring motifs, and are connected further by N—H⋯N hydrogen bonds into sheets lying parallel to the ab plane. The crystal studied was an inversion twin, the refined ratio of the twin components being 0.50 (3):0.50 (3).
doi:10.1107/S1600536812005442
PMCID: PMC3295472  PMID: 22412583

Results 1-6 (6)