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Synthesis of 5-Substituted-1H-tetrazoles. -One-pot conversion of aryl iodides to nitriles and direct [2 + 3] cycloaddition with sodium azide offers a convenient synthesis of 5-aryl-1H-tetrazoles. The cyanation step is independently screened revealing nanosized CuO as optimal catalyst which can be easily recovered and reused at least four times without any significant loss of activity. -(YAPURI, U.; PALLE, S.; GUDAPARTHI, O.; NARAHARI, S. R.; RAWAT, D. K.; MUKKANTI, K.; VANTIKOMMU*, J.; Tetrahedron Lett. 54 (2013) 35, 4732-4734, http://dx.