scholarly journals 1-Deacetoxy-1-oxocaesalmin

2014 ◽  
Vol 70 (6) ◽  
pp. o662-o662
Author(s):  
Juan Feng ◽  
Jian-Long Zhang ◽  
Rong-Rong Zhang ◽  
Li-Jun Ruan ◽  
Ren-Wang Jiang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Furan Ring ◽  
Chair Conformation ◽  
Chain Structure ◽  
Membered Ring ◽  
Axis Direction ◽  
Compound C ◽  
A Chain

The title compound, C24H30O7, is a diterpenoid isolated from the seeds ofCaesalpinia minax. It consists of two cyclohexane rings (AandB), one unsaturated six-membered ring (C) and one furan ring (D). The stereochemistry of the ring junctures isA/B transandB/C trans. RingsAandBhave normal chair conformations whileCadopts a twisted half-chair conformation due to fusion to the furan ring which is planar [r.m.s. deviation = 0.0009 (2) Å]. In the crystal, hydroxyl O—H...Ocarbonylhydrogen bonds link the molecules into a chain structure extending along thea-axis direction.

scholarly journals 4-Dichloromethyl-4-methyl-5-(nitromethyl)cyclohex-2-enone

2013 ◽  
Vol 69 (11) ◽  
pp. o1638-o1638 ◽  
Author(s):  
Sladjana B. Novaković ◽  
Marko V. Rodić ◽  
Željko K. Jaćimović ◽  
Zoran Ratković ◽  
Slobodan Sukdolak
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
Axis Direction ◽  
Compound C ◽  
Acceptor Atom ◽  
A Chain

In the title compound, C9H11Cl2NO3, the six-membered ring adopts a screw-chair conformation. In the crystal, two different C—H...O hydrogen bonds involving the same acceptor atom connect the molecules into a chain extending along thec-axis direction.

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 (−)-Benzyl 2,3-dideoxy-β-D-erythro-hex-2-enopyranoside

2013 ◽  
Vol 69 (12) ◽  
pp. o1811-o1811 ◽  
Author(s):  
Shigeru Ohba ◽  
Hayato Okazaki ◽  
Yuji Ueda ◽  
Kengo Hanaya ◽  
Mitsuru Shoji ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Site Occupancy ◽  
Phenyl Group ◽  
Chair Conformation ◽  
Membered Ring ◽  
Axis Direction ◽  
Sugar Moiety ◽  
Compound C ◽  
Common Plane

In the title compound, C13H16O4, the six-membered ring of the sugar moiety shows a half-chair conformation. In the crystal, molecules are connectedviaO—H...O hydrogen bonds, forming columns around twofold screw axes along theb-axis direction. There is a disorder of the benzyloxy group, which has two possible orientations with the phenyl group lying on a common plane [site-occupancy factors = 0.589 (9) and 0.411 (9)].

scholarly journals Crystal structure of (E)-N′-{[(1R,3R)-3-isopropyl-1-methyl-2-oxocyclopentyl]methylidene}-4-methylbenzenesulfonohydrazide

2015 ◽  
Vol 71 (2) ◽  
pp. o99-o100 ◽  
Author(s):  
David Tymann ◽  
Dina Christina Dragon ◽  
Christopher Golz ◽  
Hans Preut ◽  
Carsten Strohmann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Aromatic Ring ◽  
Title Compound ◽  
Membered Ring ◽  
Dihedral Angles ◽  
Relative Configuration ◽  
Axis Direction ◽  
Compound C ◽  
A Chain

The title compound, C17H24N2O3S, was synthesized in order to determine the relative configuration of the corresponding β-keto aldehyde. In the U-shaped molecule, the five-membered ring approximates an envelope with the methylene atom adjacent to the quaternary C atom being the flap. The dihedral angles between the four nearly coplanar atoms of the five-membered ring and the flap and the aromatic ring are 38.8 (4) and 22.9 (2)°, respectively. The bond angles around the S atom are in the range 104.11 (16)–119.95 (16)°. In the crystal, molecules are linkedviaN—H...O by hydrogen bonds, forming a chain along thea-axis direction.

scholarly journals N-[(3aR*,3bS*)-1,3b,7,7-Tetramethyl-3a,3b,4,5,6,7,7a,7b-octahydro-3H-cyclopenta[3,4]cyclobuta[1,2]benzen-3a-yl]acetamide

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 ◽  
Chair Conformation ◽  
Membered Ring ◽  
Dihedral Angles ◽  
Axis Direction ◽  
Compound C ◽  
The Mean ◽  
Cyclobutane Ring ◽  
Cyclopentene Ring

The title compound, C17H27NO, is built up from a four-membered ring to which a six- and a five-membered ring are fused. The cyclohexane ring has a chair conformation, while the cyclopentene ring has an envelope conformation, with the C atom substituted by the acetamide group as the flap. The dihedral angles between the mean plane of the central cyclobutane ring and the mean planes of the cyclopentene and cyclohexane rings are 62.52 (2) and 61.06 (11)°, respectively. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming chains propagating along theb-axis direction.

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.

3-Acetyl-4-furyl-1-methylspiro[pyrrolidine-2,2′-indol]-2′(3′H)-one

2006 ◽  
Vol 62 (5) ◽  
pp. o1964-o1965
Author(s):  
A. Subbiahpandi ◽  
D. Velmurugan ◽  
K. Ravikumar ◽  
R. R. Durga ◽  
R. Raghunathan
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Furan Ring ◽  
Chair Conformation ◽  
Pyrrolidine Ring ◽  
Axis Direction ◽  
Compound C

In the title compound, C18H18N2O3, the central pyrrolidine ring adopts a half-chair conformation. The furan ring is almost perpendicular to the oxindole system. Intermolecular C—H...O and N—H...N hydrogen bonds link the molecules into ribbons running along the b-axis direction.

scholarly journals tert-Butyl (2S,3R,4R)-7′-bromo-4-methyl-2′,5-dioxo-4,5-dihydro-3H-spiro[furan-2,3′-indoline]-3-carboxylate

IUCrData ◽  
2017 ◽  
Vol 2 (3) ◽  
Author(s):  
Chen-Hong Meng ◽  
Ai-Bao Xia
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Furan Ring ◽  
Axis Direction ◽  
Tert Butyl ◽  
Envelope Conformation ◽  
Compound C ◽  
The Mean

In the title compound, C17H18BrNO5, the furan ring has an envelope conformation with the carboxylate substituted C atom as the flap. The planar indoline ring is inclined to the mean plane of the furan ring by 87.5 (2)°. In the crystal, molecules are linked by N—H...O and C—H...O hydrogen bonds forming chains propagating along the a-axis direction.

scholarly journals Crystal structure of racemic [(1R,2S,3R,4S,6S)-2,6-bis(furan-2-yl)-4-hydroxy-4-(thiophen-2-yl)cyclohexane-1,3-diyl]bis(thiophen-2-ylmethanone)

2016 ◽  
Vol 72 (7) ◽  
pp. 976-979 ◽  
Author(s):  
Ísmail Çelik ◽  
Cem Cüneyt Ersanlı ◽  
Mehmet Akkurt ◽  
Hayrettin Gezegen ◽  
Rahmi Köseoğlu
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Hydroxy Group ◽  
Title Compound ◽  
Furan Ring ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Π Interactions ◽  
Compound C

In the title compound, C28H22O5S3, the central cyclohexane ring adopts a chair conformation. The atoms of the furan ring attached to the 6-position of the central cyclohexane ring are disordered over two sets of sites with occupancies of 0.832 (5) and 0.168 (5). The hydroxy group is disordered over two positions (at the 4- and 6-positions of the cyclohexane ring) in the ratio 0.832 (5):0.168 (5). In the crystal, molecules are linked by C—H...O hydrogen bonds and C—H...π interactions, forming layers parallel to (100).

scholarly journals Crystal structure of 7,7-dimethyl-6-methylidenetricyclo[6.2.1.01,5]undecane-2-carboxylic acid

2015 ◽  
Vol 71 (2) ◽  
pp. o94-o94
Author(s):  
Noureddine Beghidja ◽  
Samir Benayache ◽  
Fadila Benayache ◽  
David W. Knight ◽  
Benson M. Kariuki
Keyword(s):  
Crystal Structure ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Rotation Axis ◽  
Chair Conformation ◽  
Membered Ring ◽  
Envelope Conformation ◽  
Compound C ◽  
Carboxylic Groups

In the title compound, C15H22O2, both five-membered rings display an envelope conformation whereas the six-membered ring displays a chair conformation. In the crystal, pairs of O—H...O hydrogen bonds between carboxylic groups link molecules, related by a twofold rotation axis, into supramolecular dimers.

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