SEARCH Articles Figures Tables Cycloaddition facial selectivity Cycloaddition oxide Cycloadditions oxidative Facial Facial selection Facial selectivity Nitrile oxide cycloaddition Nitrile oxides Nitrile oxides cycloadditions Nitriles cycloaddition Nitriles cycloadditions Nitriles nitrile oxides Oxidative cycloaddition Oxidative nitriles