An efficient method was developed for the [2 + 3] cycloaddition of sodium azide with nitriles to afford 5‐substituted 1H‐tetrazoles using nanonickel ferrite (NiFe2O4) as an effective heterogeneous catalyst in dimethylformamide. The main advantages of this method are high yields, simple methodology and easy work‐up. The catalyst can be recovered and reused for several cycles with predictable activity. Copyright © 2015 John Wiley & Sons, Ltd.

The substitution effect of various functional groups such as -NO 2 , -CN, -N 3 , -NF 2 , and -NH 2 on the density of tetrazolium nitrate salts is investigated through multiple linear regression method. The methodology of this work introduces a new model, which related density of tetrazolium nitrate salts to the number of fluorine and nitrogen atoms, the presence of NF 2 groups, NO 2 groups, as well as CH 3 groups in the structural formula. The new reliable correlation shows that the NF 2 and NO 2 group can cause increasing the density of tet-* Dr. N. Zohari Fax: +98-2122970195 E-Mail: nargeszohari@gmail.com [a]

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Synthesis of 5-Substituted 1H-Tetrazoles Using a Recyclable Heterogeneous Nanonickel Ferrite Catalyst. -An efficient approach to 5-substituted 1H-tetrazoles via nanonickel ferrite catalyzed [2+3] cycloaddition of sodium azide with nitriles is presented. The catalyst can be recovered for at least five times without significant loss of activity. -(ABRISHAMI*, F.; EBRAHIMIKIA, M.; RAFIEE, F.; Appl. Organomet. Chem. 29 (2015) 11, 730-735, http://dx.

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