FeCl₃–SiO₂ as a reusable heterogeneous catalyst for the synthesis of 5-substituted 1H-tetrazoles via [2+3] cycloaddition of nitriles and sodium azide

Mahmoud Nasrollahzadeh, Yadollah Bayat, Davood Habibi and Saeed Moshaee

Tetrahedron Letters 50 ( 31 ): 4435 - 4438 , 2009