Z/E (C= C)-isomerization of coumarin enamines induced by organic solvents
VF Traven, IV Ivanov, VS Lebedev, BG Milevskii… - Mendeleev …, 2009 - Elsevier
… Here, we report the Z/E-isomerization of imines 1 and 2 of 3-formyl-4-hydroxycoumarin
induced by organic solvents. Spectral grade CDCl3 and [2H6]DMSO have been used. The
structure of imine 1 has been studied by Wolfbeis et al.,12 however, its E/Z-… We have found
that the solvent effect on Z/E-isomerization becomes greater when a more polar solvent is used.
Thus, the 1H NMR spectrum of imine 1 reflects evidences of its much faster isomerization in
[2H6]DMSO solution. Signal of 9-H at 8.70 ppm is a broad singlet immediately after dissolution …
induced by organic solvents. Spectral grade CDCl3 and [2H6]DMSO have been used. The
structure of imine 1 has been studied by Wolfbeis et al.,12 however, its E/Z-… We have found
that the solvent effect on Z/E-isomerization becomes greater when a more polar solvent is used.
Thus, the 1H NMR spectrum of imine 1 reflects evidences of its much faster isomerization in
[2H6]DMSO solution. Signal of 9-H at 8.70 ppm is a broad singlet immediately after dissolution …
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