NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY AND THE STRUCTURES OF THE REGIOISOMERIC PRODUCTS OF THE CYCLOADDITION OF C-ETHOXYCARBONYL-N-ARYLNITRILIMINES TO ALPHA,BETA-UNSATURATED KETONES
NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY AND THE STRUCTURES OF THE REGIOISOMERIC PRODUCTS OF THE CYCLOADDITION OF C-ETHOXYCARBONYL-N-ARYLNITRILIMINES TO ALPHA,BETA-UNSATURATED KETONES