Uncatalyzed reactions of α-(trihaloethylidene)nitroalkanes with push-pull enamines: a new type of ring-ring tautomerism in cyclobutane derivatives and the dramatic effect of the trihalomethyl group on the reaction pathway
Keywords: Conjugated nitroalkenes; Push-pull enamines; Cyclobutanes; 1,2-Oxazine N-oxides; Ring-ring tautomerism; Michael addition; 1D and 2D NMR spectroscopy; X-ray diffraction analysis;