Raney Ni efficiently catalyzes acetylene azide cycloaddition reactions to form 1,2,3-triazoles. Unlike the CuSO4/sodium ascorbate reagent system, there is no need for a reducing agent under Raney Ni catalysis. Terminal acetylene selectivity, 1,4-regioselectivity and mild reaction conditions are prominent features of the method. Mechanistic probing revealed that the reaction does not go through nickel acetylides.
H. Surya Prakash Rao and G. Chakibanda, RSC Adv., 2014, 4, 46040 DOI: 10.1039/C4RA07057G
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