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Intramolecular hydrogen bonds of gossypol imine derivatives
Physical Chemistry Chemical Physics, 2023Study of the intramolecular hydrogen bonds of gossypol imine derivatives helps in understanding and predicting tautomeric transitions in different media.
Oleksii M. Dykun +3 more
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Intramolecular hydrogen bonding in silanediols
Journal of Molecular Structure: THEOCHEM, 2004Abstract The analysis of equilibrium geometries and energies of silanediols with NH 2 and carbonyl groups in their side chains shows that the intramolecular hydrogen bonding exist in all studied systems. In the (CH 2 NH 2 )(CH 3 )Si(OH) 2 system, these bonds are weak and do not play the decisive role in the relative stabilities of isomers, while in
Igor S. Ignatyev +2 more
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Intramolecular Hydrogen Bonding in Calixarenes
Chemistry - A European Journal, 2000The construction of a molecular cavity for recognition and catalysis requires either covalent synthesis or intermolecular self-assembly of complementary units. Intramolecular hydrogen bonding is another tool to control the cavity-forming process. When properly positioned within the same molecular structure, hydrogen bonding sites are responsible for ...
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Intramolecular Hydrogen Bonding in Substituted Aminoalcohols
The Journal of Physical Chemistry A, 2016The qualifying features of a hydrogen bond can be contentious, particularly where the hydrogen bond is due to a constrained intramolecular interaction. Indeed there is disagreement within the literature whether it is even possible for an intramolecular hydrogen bond to form between functional groups on adjacent carbon atoms.
Lane, Joseph R. +3 more
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2020
In intramolecular hydrogen bonds the proton donor and proton acceptor belong to the same species: molecule or ion. These links, in comparison with the intermolecular hydrogen bonds, are more often far from linearity, because of steric constraints. The six-member rings closed by intramolecular hydrogen bonds are most often analysed because they are more
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In intramolecular hydrogen bonds the proton donor and proton acceptor belong to the same species: molecule or ion. These links, in comparison with the intermolecular hydrogen bonds, are more often far from linearity, because of steric constraints. The six-member rings closed by intramolecular hydrogen bonds are most often analysed because they are more
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Intramolecular hydrogen bonding of nucleobases
Tetrahedron Letters, 2002The intramolecular hydrogen bonding of a series of linked uracil, thymine and adenine derivatives is described. The nucleoside bases have been linked by semi-flexible spacers and the chemical shifts and ΔδNH/ΔT values for the nucleoside NH protons confirm the strong intramolecular hydrogen bonding motif.
Crisp, Geoffrey T., Jiang, Yu-Lin
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Intramolecular hydrogen bonding in hydroxy-keto-steroids
Journal of the Chemical Society, Perkin Transactions 1, 1972The i.r. spectra of hydroxy-keto-steroids with an equatorial-hydroxy-group α to the ketone show a band due to hydrogen bonding (OH ⋯ O type); those with an axial hydroxy-group α or β to the ketone exhibit two absorption bands, due to a free and a bonded hydroxy-group (OH ⋯π type).
T, Suga, T, Shishibori, T, Matsuura
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Intramolecular Hydrogen Bonding in Mononitronaphthylamines
Australian Journal of Chemistry, 1960The presence of intramolecular hydrogen bonding in 2-nitro-1-naphthylamine, 1-nitro-2-naphthylamine, 3-nitro-2-naphthylamine, and 8-nitro-1-naphthylamine is inferred from a study of the NH frequencies of the 14 isomeric mononitronaphthylamines in the solvents carbon tetrachloride and pyridine.
A Bryson, RL Werner
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Intramolecular charge-inverted hydrogen bond
Journal of Molecular Structure: THEOCHEM, 2010Abstract It is shown that the Si δ + H δ - ⋯ ⊃ Al interaction, where ‘ ⊃ ’ denotes the electron lone-pair vacancy, may exist if Si δ + H δ - and ⊃ Al subunits belong to the same molecule, i.e. they may form the intramolecular charge-inverted hydrogen bond.
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The Journal of Organic Chemistry, 2010
A series of oligo(ethylene oxide) (oligoEO) substituted 2-ureido-pyrimidinones (UPy), differing in the number of ethylene oxide units and the length of the aliphatic spacer connecting the oligoEO side chain with the UPy group, have been prepared. It was found that variation in these structural parameters strongly influences the dimerization constant (K(
Greef, de, T.F.A. +3 more
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A series of oligo(ethylene oxide) (oligoEO) substituted 2-ureido-pyrimidinones (UPy), differing in the number of ethylene oxide units and the length of the aliphatic spacer connecting the oligoEO side chain with the UPy group, have been prepared. It was found that variation in these structural parameters strongly influences the dimerization constant (K(
Greef, de, T.F.A. +3 more
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