scholarly journals (1S,2R,8R)-11-Amino-2,2-dichloro-3,7,7,10-tetramethyltricyclo[6.4.0.01,3]dodec-10-en-9-one

IUCrData ◽  
2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Mustapha Ait Elhad ◽  
Ahmed Benharref ◽  
Lahcen El Ammari ◽  
Mohamed Saadi ◽  
Abdelouahd Oukhrib ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Monoclinic Space Group ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Space Group ◽  
Axis Direction ◽  
Compound C ◽  
Independent Molecules

The title compound, C16H23Cl2NO, crystallizes in the monoclinic space groupP21with two independent molecules (AandB) in the asymmetric unit. They have essentially the same conformation. Each molecule is built up from fused six- and seven-membered rings and an additional three-membered ring. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, while the seven-membered ring displays a boat conformation. In the crystal, molecules are linked into chains propagating along thea-axis direction by N—H...O hydrogen bonds.

scholarly journals N-[1,4,4-Trimethyltricyclo[6.3.1.03,9]dodec-8(12)-en-2-yl]acetamide

IUCrData ◽  
2017 ◽  
Vol 2 (6) ◽  
Author(s):  
Noureddine Mazoir ◽  
Ahmed Benharref ◽  
Jean-Claude Daran ◽  
Abdelouahd Oukhrib ◽  
Mustapha Ait Elhad ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Compound C ◽  
Independent Molecules

The title compound, C17H27NO, crystallizes with three independent molecules in the asymmetric unit with almost identical conformations. Each molecule is built up from a seven-membered ring to which a bridged six-membered ring is fused. In each of the three molecules, the seven-membered rings have a twist-chair conformation, while the cyclohexenyl rings display perfect boat conformations. In the crystal, N—H...O hydrogen bonds link the molecules into zigzag chains running along theb-axis direction.

scholarly journals (1R,2R,7S,8R,9R)-N-(2-Hydroxy-2,6,6,9-tetramethyl-12-oxatricyclo[7.2.1.01,7]dodecan-8-yl)acetamide

IUCrData ◽  
2017 ◽  
Vol 2 (7) ◽  
Author(s):  
Amed Benharref ◽  
Mustapha Ait Elhad ◽  
Noureddine Mazoir ◽  
Jean-Claude Daran ◽  
Abdelouahd Oukhrib ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Cedrus Atlantica ◽  
Compound C ◽  
Independent Molecules

The title compound, C17H29NO3, was synthesized in two steps from β-himachalene (2,6,6,9-tetramethylbicyclo[5.4.01,7]undeca-1,8-diene), which was isolated from an oil of the Atlas cedar (Cedrus Atlantica). The asymmetric unit contains two independent molecules (A and B): B features an intramolecular O—H...O hydrogen bond whereas A forms an intermolecular O—H...O link to B. Each molecule is built up from a seven-membered ring to which a bridged six-membered ring is fused: the cycloheptane rings have twist-chair conformations, while the bridged cyclohexane rings display near-perfect boat conformations. In the crystal, the molecules are linked by N—H...O and O—H...O hydrogen bonds forming helical chains propagating along the b-axis direction. Some weak C—H...O interactions are also observed.

scholarly journals Crystal structure of tetraethyl 27,30-dioxo-7,12,20,25-tetra-tert-butyl-3,16-dioxa-9,22,28,31-tetrathiaheptacyclo[21.3.1.11,5.14,8.110,14.114,18.117,21]dotriaconta-4,6,8(29),10,12,17,19,21(32),23,25-decaene-2,2,15,15-tetracarboxylate

2015 ◽  
Vol 71 (10) ◽  
pp. o778-o779
Author(s):  
Mehmet Akkurt ◽  
Jerry P. Jasinski ◽  
Shaaban K. Mohamed ◽  
Omran A. Omran ◽  
Mustafa R. Albayati
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Tert Butyl ◽  
Envelope Conformation ◽  
Compound C ◽  
A Chain

The asymmetric unit of the title compound, C54H64O12S4, consists of one half of the molecule, which is located on an inversion centre. The heterocyclic six-membered ring adopts a distorted envelope conformation with the spiro C atom as the flap. In the crystal, molecules are linked by weak C—H...O hydrogen bonds with anR22(14) motif, forming a chain along theb-axis direction.

scholarly journals (1R,4R,6S,7R)-5,5-Dibromo-1,4,8,8-tetramethyltricyclo[5.4.1.04,6]dodecan-12-one

2014 ◽  
Vol 70 (5) ◽  
pp. o526-o526 ◽  
Author(s):  
Mohamed Zaki ◽  
Ahmed Benharref ◽  
Jean-Claude Daran ◽  
Moha Berraho
Keyword(s):  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
The Other ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Cedrus Atlantica ◽  
Compound C ◽  
Independent Molecules

The title compound, C16H24Br2O, was synthesized from the reaction of β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from Atlas cedar (Cedrus atlantica). The asymmetric unit contains two independent molecules with similar conformations. Each molecule is built up from two fused seven-membered rings and an additional three-membered ring. In both molecules, one of the seven-membered rings has a chair conformation, whereas the other displays a screw-boat conformation.

(1R,4S,8R,12S,13S,14R,16S,19R)-14-Hydroxy-7,7-dimethyl-17-methylene-2,9,18-trioxo-3,10-dioxapentacyclo[14.2.1.01,13.04,12.08,12]nonadec-19-yl acetate

2007 ◽  
Vol 63 (11) ◽  
pp. o4439-o4439
Author(s):  
Hao Shi
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Chair Conformation ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Compound C ◽  
Independent Molecules ◽  
The Absolute

The title compound, C22H26O8, prepared from the natural diterpenoid Macrocalyxin J, is built up from five fused rings. Cyclohenane ring A adopts a chair conformation, ring B exists in a screw-boat conformation and ring C adopts a boat conformation; the two five membered rings adopt envelope conformations. Two unique molecules are present in the asymmetric unit; both independent molecules have the same absolute configuration, the absolute configuration being deduced from the chirality of Macrocalyxin A, which was isolated from the same plant (i.e. Rabdosia macrocalyx) as Macrocalyxin J. The crystal structure displays intermolecular O—H...O hydrogen bonds.

scholarly journals N-Methyl-2-(1,2,3,4-tetrahydronaphthalen-1-ylidene)hydrazinecarbothioamide

2014 ◽  
Vol 70 (3) ◽  
pp. o301-o302 ◽  
Author(s):  
Adriano Bof de Oliveira ◽  
Bárbara Regina Santos Feitosa ◽  
Christian Näther ◽  
Inke Jess
Keyword(s):  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Crystal Packing ◽  
Dihedral Angles ◽  
Independent Molecule ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Compound C ◽  
Independent Molecules

There are two independent molecules in the asymmetric unit of the title compound, C12H15N3S, both of which display disorder of several C atoms in the N-bound ring (occupancy ratios of 0.75:0.25 in the first independent molecule and 0.50:0.50 in the second) with the methyl H atoms also being disordered in the first molecule (occupancy ratio of 0.70:0.30). The planes of the benzene ring and the N—N—C—N fragment make dihedral angles of 12.92 (14)° in the first independent molecule and 7.60 (13)° in the second. In the crystal, molecules are linked by weak N—H...S hydrogen bonds into chains along thea-axis direction. The crystal packing ressembles a herringbone arrangement.

scholarly journals (1S,2R,3S,6S,7R)-3,7,11,11-Tetramethyl-6,7-epoxybicyclo[5.4.0]undecane-2-ol

2014 ◽  
Vol 70 (5) ◽  
pp. o595-o595
Author(s):  
Mohamed Loubidi ◽  
Ahmed Benharref ◽  
Lahcen El Ammari ◽  
Mohamed Saadi ◽  
Moha Berraho
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Axis Direction ◽  
Cedrus Atlantica ◽  
Compound C ◽  
Twist Boat

The title compound, C15H26O2, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the Atlas cedar (cedrus atlantica). The molecule is built up from a seven-membered ring to which a six- and a three-membered ring are fused. The seven- and six-membered rings each have a twist-boat conformation. In the crystal, O—H...O hydrogen bonds link the molecules into zigzag chains running along theb-axis direction.

scholarly journals Crystal structure of 1-cyclopropanecarbonyl-3-methyl-2,6-di-p-tolylpiperidin-4-one

2014 ◽  
Vol 70 (9) ◽  
pp. o1056-o1057
Author(s):  
A. Kamaraj ◽  
S. Ranjith ◽  
R. Rajkumar ◽  
G. Mohanraj ◽  
K. Krishnasamy
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Piperidine Ring ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Compound C ◽  
The Mean ◽  
Independent Molecules

The title compound, C24H27NO2, crystallizes with two independent molecules (AandB) in the asymmetric unit. The two molecules have very similar conformations and each exhibits an intramolecular C—H...π interaction. The central piperidine rings adopt boat conformations and thep-tolyl rings are inclined to the mean plane of the piperidine ring by 71.21 (11) and 89.86 (12)° in moleculeAand by 68.01 (12) and 89.33 (12)° in moleculeB. The cyclopropanecarbonyl group is oriented at an angle of 68.5 (2)° with respect to the mean plane of the piperidine ring in moleculeAand 66.2 (2)° in moleculeB. In the crystal, theAandBmolecules are linked by C—H...O hydrogen bonds, enclosingR21(6) ring motifs, forming ribbons running along thea-axis direction.

scholarly journals 3-Methylbenzo[1,2-c:5,4-c′]dichromen-6(8H)-one

2014 ◽  
Vol 70 (8) ◽  
pp. o838-o838
Author(s):  
M. Kayalvizhi ◽  
G. Vasuki ◽  
Adil I. Khatri ◽  
Shriniwas D. Samant
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Pyran Ring ◽  
Compound C ◽  
Dimensional Network ◽  
Independent Molecules

The title compound, C21H14O3, crystallizes with eight independent molecules (A–H) in the asymmetric unit which are arranged in four groups of two molecules each (AB,CD,EFandGH). In each molecule, the pyran-2-one ring is planar (r.m.s. deviations vary from 0.001 to 0.017 Å), while the pyran ring has a screw-boat conformation. In the crystal, molecules stack in two columns, along the [10-1] direction, composed of moleculesC,B,EandG, andD,A,FandH. MoleculesAandFare linkedviaC—H...O hydrogen bonds. In addition, there are a number of C—H...π contacts present involving all of the molecules. These interactions result in the formation of a three-dimensional network.

scholarly journals 4-(Prop-2-yn-1-ylsulfanyl)-1H-pyrazolo[3,4-d]pyrimidine

IUCrData ◽  
2017 ◽  
Vol 2 (10) ◽  
Author(s):  
Mohamed El Hafi ◽  
Mohammed Boulhaoua ◽  
Youssef Ramli ◽  
Mohammed Benchidmi ◽  
El Mokhtar Essassi ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Side Chain ◽  
Stacking Interactions ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Compound C ◽  
Π Stacking ◽  
Two Component ◽  
Independent Molecules

The asymmetric unit of the title compound, C8H6N4S, consists of two independent molecules differing in the orientation of the side chain. In the crystal, molecules form dimers through N—H...N hydrogen bonds. The dimers stack along thea-axis direction with weak π–π stacking interactions [centroid–centroid distances of 3.898 (2) and 3.908 (2) Å]. The crystal studied was refined as a two-component twin.

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