Zinc Hydroxyapatite–Catalyzed Efficient Synthesis of 5‐Substituted 1<i>H</i>‐Tetrazoles

Abstract

Abstract Zinc hydroxyapatite (ZnHAP) is an effective heterogeneous catalyst for the (2+3)‐cycloaddition of sodium azide with nitriles to afford 5‐substituted 1H‐tetrazoles in good yields. The catalyst is recovered and reused for several cycles with consistent activity.