N.W. Smith, et al. “Base and Concentration Effects on the Product Distribution in Copper-promoted Alkyne-Azide Cycloaddition: Additive-free Route to 5-iodo-triazoles,” Tetrahedron Letters, 2010, 51(3), 550-553

Abstract: Formation of 5-iodo-triazoles in CuI-promoted cycloadditions between alkynes and azides is controlled by DMAP and low alkyne concentrations.