Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9769871 | Journal of Molecular Structure | 2005 | 8 Pages |
Abstract
Rotation around the conjugated C-N bond was investigated through dynamic NMR experiments, employing both 1H and 13C spectra, and theoretical calculations (HF and B3LYP with the 6-311+G** and 6-31G** basis sets). Theoretical results predicted slightly distinct gas-phase rotational barriers for the isomers, although inclusion of solvation effects causes the barriers to be essentially equal. Experiments corroborate with this result. 1H and 13C spectra provided somewhat different rate constants but the activation parameters (ÎSâ¡, ÎHâ¡ and ÎGâ¡) are very similar for both. Additionally, we investigated the solvent effect through experiments in CDCl3, CD3OD, DMSO-d6 and D2O solutions and SCRF calculations. The results agree with previous studies that the rotational barrier in carbamates is solvent insensitive.
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Authors
Ernani A. Basso, Paulo R. Oliveira, Franciele Wiectzycoski, Rodrigo M. Pontes, Barbara C. Fiorin,