A Simple, Advantageous Synthesisof 5-Substituted 1H-Tetrazoles

An advantageous synthesis of 5-substituted 1 H-tetrazoleshas been developed by treatment of organic nitriles with NaN 3 inthe presence of iodine or the heterogeneous catalyst, silica--supportedsodium hydrogen sulfate (NaHSO 4 ˙SiO 2 ).