Infrared spectroscopic investigation of the conformational properties of furan-2-carboxylates |
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| Affiliation: | 1. Laboratoire de Chimie Appliquée et Technologie des Matériaux LCATM, Université d''Oum El Bouaghi, Oum El Bouaghi, 04000, Algeria;2. Département Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Universite d''Oum El Bouaghi, Oum El Bouaghi, 04000, Algeria;3. Laboratoire des Sciences Analytiques, Matériaux et Environnement, Université d''Oum El Bouaghi, Oum El Bouaghi, 04000, Algeria;4. Plant and Animal Production Department, Technical Sciences Vocational School of Sivas, Sivas Cumhuriyet University, Sivas, Turkey;5. Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Saclay, 1 avenue de la Terrasse, Gif-sur-Yvette 91198, France;1. Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Cairo University, 11561, Cairo, Egypt;2. Microbiology and Immunology Department, Faculty of Pharmacy, Cairo University, 11561, Cairo, Egypt |
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| Abstract: | As an extension of previous studies on furan-2-aldehyde, we have investigated methyl furan-2-carboxylate, ethyl furan-2-carboxylate and methyl furan-2-thiolcarboxylate in order to obtain detailed information on their conformational properties. The skeletal vibrations of the i.r. spectra in different solvents (carbon tetrachloride, acetonitrile, chloroform) and in one liquid phase show the existence of two conformers, the syn and anti forms. The conformational equilibria do not appear to be temperature-dependent, or to be altered by change of phase from liquid to solid. The relative enthalpy differences between the two conformers is indicated by the effect of solvent polarity on their ratios. |
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