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Beilstein J. Org. Chem. 2017, 13, 2396–2407, doi:10.3762/bjoc.13.237
Graphical Abstract
Figure 1: Hydrogen coupling constants (3JH-H) of (a) H6–H7 for 3a and (b) H5–H6 for 5h.
Figure 2: LUMO coefficients for (a) β-enaminones 1a,h, and their (b) conjugated acids.
Figure 3: (a) 1H and (b) 13C NMR spectra demonstrating the 3d4d equilibrium in DMSO-d6 at 25 °C.
Figure 4: ORTEP® [45] plot of 7a with thermal ellipsoids drawn at 50% probability level.
Figure 5: Tetrazolo[1,5-a]pyrimidine observed in solution (CDCl3 and DMSO-d6) and 2-azidopyrimidine observed ...
Figure 6: ORTEP® [45] plot of 8i with thermal ellipsoids drawn at 50% probability level.
Figure 7: Representation of the possible equilibrium existing between 6i, 7i, and 8i.