Anomeric effect in N-azidomethylpyrrolidine: gas-phase electron diffraction and theoretical study
Olga V Dorofeeva1, Alexander V Mitin, Ekaterina P Altova
1Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russia. dorofeeva@phys.chem.msu.ru
Abstract:
Gas-phase electron-diffraction data and high-level quantum chemical calculations have been used to study the conformational behaviour of N-azidomethylpyrrolidine. The two most stable conformers with a relative abundance of about 80% at 298 K possess gauche orientation of the azidomethyl group around the C-N(pyr) bond (C-N(azido)gauche with respect to the endocyclic N(pyr)-C bond). This orientation is a strong manifestation of an anomeric effect. The influence of the anomeric effect is also reflected in shortening of the C-N(pyr) bond and lengthening of the C-N(azido) bond as compared to such bonds in other compounds.
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