dc.creator | Abraham R.J. | |
dc.creator | Jones A.D. | |
dc.creator | Warne M.A. | |
dc.creator | Rittner R. | |
dc.creator | Tormena C.F. | |
dc.date | 1996 | |
dc.date | 2015-06-26T17:02:56Z | |
dc.date | 2015-11-26T14:18:37Z | |
dc.date | 2015-06-26T17:02:56Z | |
dc.date | 2015-11-26T14:18:37Z | |
dc.date.accessioned | 2018-03-28T21:19:54Z | |
dc.date.available | 2018-03-28T21:19:54Z | |
dc.identifier | | |
dc.identifier | Journal Of The Chemical Society. Perkin Transactions 2. , v. 4, n. , p. 533 - 539, 1996. | |
dc.identifier | 3009580 | |
dc.identifier | | |
dc.identifier | http://www.scopus.com/inward/record.url?eid=2-s2.0-54349110096&partnerID=40&md5=6e3f44d554781185bbe1be3c90a573ea | |
dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/95500 | |
dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/95500 | |
dc.identifier | 2-s2.0-54349110096 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1243687 | |
dc.description | The solvent and temperature dependence of the 1H and 13C NMR spectra of fluoroacetone (FA), 1,1-difluoroacetone (DFA) and 1,1,1-trifluoroacetone (TFA) are reported and the 4J HF, 1J CF, and 2J CF couplings analysed using ab initia calculations and solvation theory. In FA the energy difference (E cis - E tr) between the cis (F-C-C=O 0°) and trans (F-C-C=O 180°) conformers is 2.2 kcal mol -1 in the vapour, decreasing to 1.0 kcal mol -1 in CCl4 solution and to -0.6 kcal mol -1 in the pure liquid. In DFA the conformational equilibrium is between the less polar cis (H-C-C=O 0°) and a gauche conformation (H-C-C=O 104°). The energy difference (Eg - E cis) is +0.8 kcal mol -1 in the vapour, decreasing to 0.1 kcal mol -1 in CCl 4 solution and to -0.9 kcal mol -1 in the pure liquid. The vapour state energy difference for FA compares well with that calculated (2.8 kcal mol -1 at MP4/6-31G*). DFA calculations at this level gave only one minimum in the potential surface corresponding to the cis form. A minimum for the gauche conformer was only found when solvation was included in the ab initio calculations, or at much larger basis sets (6-311++G**). The conformer couplings obtained show that the 4J HF coupling (F-C-C-CH 3) is proportional to cos 2 θ, where θ is the F-C-C-C dihedral angle. The 1J CF and 2J CF couplings also show a pronounced orientation dependence which could be of particular utility in those cases where other couplings are not present. | |
dc.description | 4 | |
dc.description | | |
dc.description | 533 | |
dc.description | 539 | |
dc.description | Abraham, R.J., Leonard, P., Smith, T.A.D., Thomas, W.A., (1996) Magn. Reson. Chem., 34 (26 PART), p. 71 | |
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dc.description | Foreman, J.B., Frisch, A., (1993) Exploring Chemistry with Electronic Structure Methods: A Guide to Using Gaussian, , Gaussian Inc., Pittsburgh, PA | |
dc.description | Abraham, R.J., Bretschneider, E., (1974) Internal Rotation in Molecules, , ed. W. J. Orville-Thomas, Academic Press, London, ch. 13 | |
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dc.description | Veken, B.J.V., Truyen, S., Herrebout, W.A., Watkins, G., (1993) J. Mol. Struct., 293, p. 55 | |
dc.description | Abraham, R.J., Angiolini, S., Edgar, M., Sancassan, F., (1995) J. Chem. Soc., Perkin Trans. 2, p. 1973 | |
dc.description | Kaisen, C.R., (1982), Ph.D. Thesis, Universidade Estadual de Campines, Campinas | |
dc.language | en | |
dc.publisher | | |
dc.relation | Journal of the Chemical Society. Perkin Transactions 2 | |
dc.rights | fechado | |
dc.source | Scopus | |
dc.title | Conformational Analysis. Part 27. Nmr, Solvation And Theoretical Investigation Of Conformational Isomerism In Fluoro- And 1,1-difluoro-acetone | |
dc.type | Artículos de revistas | |