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Search query: syn conformation
674 articles match your search "syn conformation"Results 1 to 10, sorted by relevance:
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The tennimide macrocycle (I) resides on a twofold axis and adopts an alternate (syn/anti)2 conformation with no inner cavity (niche), unlike all previously reported (syn)4 tennimide conformations. A partial occupancy water molecule (with 0.167 site occupancy) at hydrogen-bonding distances to two symmetry-related carbonyl O atoms (as O—H
O=C) resides on the twofold axis in a molecular niche between two of the pyridine rings. Macrocycle aggregation occurs as one-dimensional chains along the (010) direction.
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The structure of N-bromo-S-(4-nitrophenyl)-S-phenylsulfimide, the first crystal structure of an N-halosulfimide, is reported.
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The title compound [systematic name: 4-amino-5-cyano-1-(β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine hemihydrate], C12H13N5O4·0.5H2O, is a regioisomer of toyocamycin with the ribofuranosyl residue attached to the pyrimidine moiety of the heterocycle. This analogue exhibits a syn glycosylic bond conformation with a χ torsion angle of 57.51 (17)°. The ribofuranose moiety shows an envelope C2′-endo (2E) sugar conformation (S-type), with P = 161.6 (2)° and τm = 41.3 (1)°. The conformation at the exocyclic C4′—C5′ bond is +sc (gauche, gauche), with a γ torsion angle of 54.4 (2)°. The crystal packing is stabilized by intermolecular O—H
O, N—H
N and O—H
N hydrogen bonds; water molecules, located on crystallographic twofold axes, participate in interactions. An intramolecular O—H
N hydrogen bond stabilizes the syn conformation of the nucleoside.
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In the anhydrate crystal of diammonium aquabis(malonato)oxidovanadate(IV), (NH4)2[VO(C3H2O4)2(H2O)], two conformers (syn or anti conformation on the equatorial plane) of complex cations are detected. The DFT calculations for the isomers indicate a slight influence of the conformation on their thermodynamic stability. The anionic complexes interact with adjacent anions and counter-cations through hydrogen bonds, and the hydrogen bonds lead to a structure with alternate stacking of layers consisting of either anti or syn isomers.
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Two new polymorphic forms of 5-nitrofurazone (5-nitro-2-furaldehyde semicarbazone) have been synthesized and structurally characterized by single-crystal and powder X-ray diffraction methods, vibrational spectroscopy, thermal and Hirshfeld surface analysis.
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The phenyloxalamate group has become a particularly important and versatile supramolecular building block in the context of conformationally controlled molecular clefts.
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The title functionalized metacyclophane was crystallized as an ethyl acetate solvate.
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In the title compound, the imidizadoline ring adopts an envelope conformation and the nitrogen lone pairs are oriented in a syn disposition. The crystal packing is stabilized by C—H
O hydrogen-bonding interactions.
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Five crystals of purine 3′:5′-cyclic nucleotides, viz. cAMP·2H2O, cAMP·0.3H2O, cGMP·5H2O, Na(cGMP)·4H2O and Na(cIMP)·4H2O, have been characterized in terms of the nucleobase syn–anti conformation, ribose and O/P/O/C/C/C ring puckering, inter-nucleotide interactions and nucleotide–Na interactions. The syn–anti preference of various purine nucleotides is analysed statistically based on data from the Cambridge Structural Database.
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The structures of eight benzoylhydrazones show similar conformations and hydrogen-bonding patterns. In most cases, the phenyl ring of the benzoyl group is rotated by about 30° with respect to the keto group. Only one of the amide groups exhibits the syn conformation.