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1.  Crystal structure of 2-(1,3-dioxoindan-2-yl)iso­quinoline-1,3,4-trione 
In the title iso­quinoline-1,3,4-trione derivative, C18H9NO5, the five-membered ring of the indane fragment adopts an envelope conformation with the nitro­gen-substituted C atom being the flap. The planes of the indane benzene ring and the iso­quinoline-1,3,4-trione ring make a dihedral angle of 82.06 (6)°. In the crystal, mol­ecules are linked into chains extending along the bc plane via C—H⋯O hydrogen-bonding inter­actions, enclosing R 2 2(8) and R 2 2(10) loops. The chains are further connected by π–π stacking inter­ations, with centroid-to-centroid distances of 3.9050 (7) Å, forming layers parallel to the b axis.
doi:10.1107/S2056989014025997
PMCID: PMC4331915
crystal structure; iso­quinoline-1,3,4-trione derivative; synthesis; hydrogen bonding; pharmacological properties
2.  2-Hy­droxy-2-(3-oxobutan-2-yl)indan-1,3-dione 
In the indane ring system of the title mol­ecule, C13H12O4, the hy­droxy-bearing C atom is 0.134 (1) Å out of the plane of the remaining essentially planar atoms (r.m.s. deviation = 0.010 Å). In the crystal, mol­ecules are linked into chains along the b axis by inter­molecular O—H⋯O hydrogen bonds. Additional stabilization is provided by weak inter­molecular C—H⋯O hydrogen bonds.
doi:10.1107/S1600536811020253
PMCID: PMC3152143  PMID: 21836987
3.  2-Methyl-5-nitro-1H-benzimidazole monohydrate 
In the title compound, C8H7N3O2·H2O, the 2-methyl-5-nitro-1H-benzimidazole mol­ecule, excluding the methyl H atoms, is approximately planar, with a maximum deviation of 0.137 (1) Å. The crystal structure is stabilized by water mol­ecules via N—H⋯O(water), O(water)—H⋯O and O(water)—H⋯N hydrogen bonds, forming sheets parallel to the (100) plane. A short inter­molecular contact between the benzene and imidazole rings, with a centroid–centroid distance of 3.6419 (10) Å, indicates a π–π inter­action.
doi:10.1107/S1600536811019027
PMCID: PMC3120310  PMID: 21754885
4.  3a,8a-Dihy­droxy-1,3,3a,8a-tetra­hydro­indeno­[1,2-d]imidazole-2,8-dione 
In the title mol­ecule, C10H8N2O4, the imidazolidine ring adopts a twisted conformation. In the crystal, the mol­ecules are linked via a pair of bifurcated inter­molecular O—H⋯O hydrogen bonds, forming an inversion dimer. The dimers are further linked via N—H⋯O hydrogen bonds into a tape along the b axis.
doi:10.1107/S1600536811019039
PMCID: PMC3120574  PMID: 21754886
5.  9-(3,4-Dimeth­oxy­phen­yl)-3,4,5,6,7,9-hexa­hydroxanthene-1,8(2H)-dione 
In the title compound, C21H22O5, the mean planes of the pyran and dimeth­oxy­phenyl rings are nearly perpendicular to one another, with the dihedral angle between them being 88.21 (8)°. The pyran ring adopts a boat conformation whereas the two fused cyclo­hexane rings adopt envelope conformations. In the crystal, mol­ecules are linked into a three-dimensional network by inter­molecular C—H⋯O hydrogen bonds.
doi:10.1107/S1600536811017867
PMCID: PMC3120437  PMID: 21754824
6.  Cholest-5-ene 
The asymmetric unit of the title compound, C27H46, contains two crytallographically independent cholest-5-ene mol­ecules (A and B). In each mol­ecule, the three six-membered rings are all in chair conformations, while the five-membered ring is in a twist conformation. The terminal isopropyl group of mol­ecule A has a (−)-gauche conformation, whereas that of mol­ecule B has a (+)-gauche conformation. No significant inter­molecular inter­actions are observed in the crystal structure.
doi:10.1107/S1600536811016783
PMCID: PMC3120455  PMID: 21754760
7.  3-(2-Amino-5-nitro­anilino)-5,5-dimethyl­cyclo­hex-2-en-1-one 0.25-hydrate 
The asymmetric unit of the title compound, C14H17N3O3·0.25H2O, comprises two independent organic mol­ecules and a water mol­ecule lying on a crystallographic twofold rotation axis with 50% site occupancy. In both independent mol­ecules, the cyclo­hexene rings adopt envelope conformations but superposition of the two molecules shows that the flap atoms point in opposite directions. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds inter­connect adjacent mol­ecules into a three-dimensional network. Weak inter­molecular π–π aromatic stacking inter­actions [centroid–centroid distances = 3.4985 (9) and 3.6630 (9) Å] are also observed.
doi:10.1107/S1600536810033933
PMCID: PMC3008006  PMID: 21588741
8.  2,3-Dimethyl-6-nitro­quinoxaline 
The asymmetric unit of the title quinoxaline compound, C10H9N3O2, contains two crystallographically independent mol­ecules (A and B). The quinoxaline ring systems are essentially planar, with maximum deviations of 0.006 (1) and 0.017 (1) Å, respectively, for mol­ecules A and B. In mol­ecule A, the dihedral angle formed between the quinoxaline ring system and nitro group is 10.94 (3)° [6.31 (13)° for mol­ecule B]. In the crystal, mol­ecules are linked into chains propagating along [001]: one forms zigzag chains linked by C—H⋯O hydrogen bonds, whilst the other forms ladder-like chains by way of C—H⋯N and C—H⋯O hydrogen bonds. The packing is further consolidated by weak π–π inter­actions [range of centroid–centroid distances = 3.5895 (7)–3.6324 (7) Å].
doi:10.1107/S1600536810024463
PMCID: PMC3006956  PMID: 21588035
9.  1,3,3-Trimethyl-1,2,3,4-tetra­hydro­pyrido[1,2-a]benzimidazol-1-ol 
In the title compound, C14H18N2O, the benzimidazole grouping is close to planar, with a maximum deviation of 0.042 Å; the six-membered non-aromatic ring adopts an envelope conformation. In the crystal structure, mol­ecules are linked into infinite sheets lying parallel to the bc plane by O—H⋯N and C—H⋯O hydrogen bonds.
doi:10.1107/S1600536810024487
PMCID: PMC3006987  PMID: 21588036
10.  Cholest-5-en-7-one 
In the deca­hydro­phenanthrenone ring system of the title compound, C27H44O, the two cyclo­hexane rings adopt chair conformations, whereas the cyclo­hexene ring adopts an envelope conformation. The cyclo­pentane ring is twisted. In the crystal structure, mol­ecules are stacked along the a axis, but no significant inter­molecular inter­actions are observed.
doi:10.1107/S1600536810021598
PMCID: PMC3007018  PMID: 21587894
11.  11H-Indeno­[1,2-b]quinoxalin-11-one 
In the title compound, C15H8N2O, the fused ring system is approximately planar, with a maximum deviation of 0.039 (1) Å. In the crystal, weak inter­molecular C—H⋯O inter­actions help to establish the packing.
doi:10.1107/S1600536810019252
PMCID: PMC2979415  PMID: 21579556
12.  3β-Chloro­cholest-5-en-7-one 
The title compound, C27H43ClO, is a steroid derivative composed of a saturated carbon fused-ring framework with an alkyl side chain. The A and C rings have chair conformations and the B and D rings assume half-chair conformations. The cholesterol side chain is fully extended with a gauche, trans conformation of the terminal methyl groups. In the crystal structure, the molecules are aligned in an antiparallel fashion, forming alternate layers. These layers are then linked via C—H⋯O hydrogen bonds, forming a three-dimensional network.
doi:10.1107/S1600536810006380
PMCID: PMC2983643  PMID: 21580431
13.  Cholest-5-en-3β-yl N-phenyl­carbamate 
In the title compound, C34H51NO2, the dihedral angle between the planes of the phenyl ring and the carbonyl group is 9.30 (2)°. No significant inter­molecular inter­actions are observed in the crystal structure. The C5H11 fragment is disordered over two positions with site occupancies of 0.611 (6) and 0.389 (6).
doi:10.1107/S1600536809049010
PMCID: PMC2972052  PMID: 21578937
14.  Redetermination of ethyl (3a-cis)-3a,8b-dihydr­oxy-2-methyl-4-oxo-3a,8b-dihydro-4H-indeno[1,2-b]furan-3-carboxyl­ate monohydrate 
The crystal structure of the title compound, C15H14O6·H2O, has been redetermined from single-crystal X-ray data. The structure was originally determined by Peet et al. [J. Heterocycl. Chem. (1995), 32, 33–41] but the atomic coordinates were not reported or deposited in the Cambridge Structural Database. The ethyl substituent is disordered over two sites with refined occupancies of 0.815 (6) and 0.185 (6). The indeno group is almost planar [maximum deviation 0.0922 (14) Å] and makes an angle of 68.81 (4)° with the furan ring. The fused ring molecules are assembled in pairs by intermolecular O—H⋯O hydrogen bonds. The resulting dimers are also hydrogen bonded to the water molecules, forming double-stranded chains running along the a axis.
doi:10.1107/S1600536809039403
PMCID: PMC2971414  PMID: 21578232

Results 1-14 (14)