1,2,3-Triazole formation

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The azide and the alkyne undergo 1,3-dipolar cycloaddition to yield the 1,2,3-triazole.This regiochemistry is favoured by copper catalysis.

H. Jalani, A. Karagöz and S. Tsogoeva, Synthesis (Stuttg)., 2016, 49, 29–41.