Intramolecular hydrogen bond directed stable conformations of benzoyl phenyl oxalamides: unambiguous evidence from extensive NMR studies and DFT-based computations |
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| Authors: | P. Dhanishta P. Sai Siva kumar Sandeep Kumar Mishra N. Suryaprakash |
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| Affiliation: | NMR Research Centre, Indian Institute of Science, Bangalore 560 012 India, Fax: +91-80-23601550, +91-80-23607344, +91-80-22933300, +91-9845124802 ; Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 India ; Department of Chemistry, University of Missouri, Kansas City USA |
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| Abstract: | A number of benzoyl phenyl oxalamide derivatives have been synthesized and characterized by the extensive utility of one- and two-dimensional NMR experimental techniques. The manifestation of intramolecular hydrogen bonds in all of the synthesized molecules, convincingly established using NMR studies, governs the stable conformations of the molecules. In the fluorine substituted molecules, the coupling between two NMR active nuclei mediated through hydrogen bonds has been detected. The measured chemical shift difference of an NH proton has been employed to calculate the energy of the HBs. NMR analysis revealed the electrostatic nature of the hydrogen bonds in all of the molecules. The NMR experimental findings have been validated using Density Functional Theory (DFT)-based Non Covalent Interactions (NCIs) and Quantum Theory of Atoms In Molecules (QTAIM) computations.Hydrogen bond directed stable conformations of benzoyl phenyl oxalamide derivatives. |
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