“…In this context, nickel as a transition metal catalyst, creates a promising center of attraction toward the researchers. Nanoparticles (NPs), having unusually huge surface area and large number of active sites, can efficiently catalyze several organic reactions providing the advantages of high atom economy, mild reaction conditions, simplified isolation of product, easy recovery, and recyclability of the catalysts. − Considering the ongoing attempts and increasing awareness to develop simple, environment-friendly, economic, and profitable synthetic methods, nickel-based NPs can serve as a powerful alternative. , Incidentally, several reports are available in the literature regarding the synthesis of tetrazole compounds catalyzed by diverse type of nickel-based NPs. − Moreover, aldoxime derivatives have captured the attention of synthetic organic chemists during the past few years − because of their good reactivity and less toxic nature and the fact that they can be prepared very easily. Very recently, Patil, Babu, and Matsugi have reported, respectively, the homogeneous Cu(OAc) 2 , InCl 3 , and DPPA catalyzed synthesis of 5-substituted 1 H -tetrazoles from aldoxime and sodium azide.…”