Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1400971 | Journal of Molecular Structure | 2016 | 12 Pages |
•Benzyl 2-deoxy-2-hydroxyimino-d-hexopyranosides were synthesized.•The E/Z oxime isomerization was observed.•DFT optimizations for the α-Z, α-E, β-Z the β-E stereoisomers were performed.•Tendency to E/Z oxime isomerization is indicated.•X-Ray analysis and NMR spectra confirm our theoretical studies.
The Z/E isomerisations of the synthesized benzyl 3,4,6-tri-O-acetyl-2-deoxy-2-hydroxyimino-d-hexopyranosides during the NMR measurement and during the Zemplén O-deacetylation were observed. In order to study stabilities and tendency of the obtained compounds to isomerise, B3LYP/6-311++G∗∗ level geometry optimisations for four stereoisomers of methyl 2-deoxy-2-hydroxyimino-d-arabino-hexopyranosides in both the O-acetylated and O-deacetylated forms were performed. The results of our theoretical studies are fully in agreement with the experimental data and NMR analysis. Additionally, a single-crystal X-ray diffraction data for benzyl 2-deoxy-2-hydroxyimino-α-d-lyxo-hexopyranoside are reported to supplement our theoretical studies.
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