SEARCH Articles Figures Tables Alkynes 2+2]-cycloadditions Alkynes cycloaddition Azide-Alkyne Cycloaddition Azides cycloaddition Azides cycloadditions Copper -catalyzed azide-alkyne Copper azide Copper-catalyzed azide-alkyne cycloaddition Copper-catalyzed cycloadditions Cycloaddition copper catalyzed