Effect of sulfur oxidation on the transmission mechanism of4JHH NMR coupling constants in 1,3-dithiane
Long-range 4JHH couplings in 1,3-dithiane derivatives are rationalized in terms of the effects of hyperconjugative interactions involving the S=0 group. Theoretical and experimental studies of 4JHH couplings were carried out in 1,3-dithiane-l-oxide (2), cw-l,3-dithiane-l,3-dioxide (3), l,3-dithiane-...
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| Otros Autores: | , , |
| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
2009
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | Long-range 4JHH couplings in 1,3-dithiane derivatives are rationalized in terms of the effects of hyperconjugative interactions involving the S=0 group. Theoretical and experimental studies of 4JHH couplings were carried out in 1,3-dithiane-l-oxide (2), cw-l,3-dithiane-l,3-dioxide (3), l,3-dithiane-l,l,3-trioxide (4), and 1,3-dithiane-1,1,3,3-tetraoxide (5) compounds. Hyperconjugative interactions were studied with the natural bond orbital, NBO, method. Hyperconjugative interactions involving the LP O, oxygen lone pair and σ*C2-S1 and σ*S1-C6 antibonding orbitals yield an increase of 4JHeq-Heq couplings. Long-range 4JHax-Hax couplings were also observed between hydrogen atoms in axial orientation, which are rationalized as originating in hyperconjugative interactions involving the bonding σC6-h axand antibonding σ*S=O orbitals. The symmetry for orbital interactions is possible only when the S=0 group is in the axial orientation. © 2009 American Chemical Society. |
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| ISSN: | 10895639 |
| DOI: | 10.1021/jp810981z |