NOVEL E–Z EQUILIBRIUM OF N-ALKYL-α-ALKOXYCARBONYLNITRONE IN SOLUTION

Four N-alkyl-α-alkoxycarbonylnitrones were prepared and their NMR spectra in C6D6, CDCl3, or CD3SOCD3 were measured. From the analyses of the spectra, it was found that the nitrones exhibited a facile equilibrium in all solvents used and E/Z ratio in equilibrium depended largely on the polarity of the solvent.