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5-Aminotetrazole monohydrate is a useful reagent in condensation reactions to form pyrimidines.
Thomas M. Klapötke and Jörg Stierstorfer. Nitration Products of 5-Amino-1H-tetrazole and Methyl-5-amino-1H-tetrazoles - Structures and Properties of Promising Energetic Materials. Helvetica Chimica Acta. 2007, 90 (11), 2132-2150.
Anton Hammerl; Michael A. Hiskey; Gerhard Holl; Thomas M. Klapötke; Kurt Polborn; Jörg Stierstorfer; and Jan J. Weigand. Azidoformamidinium and Guanidinium 5,5-Azotetrazolate Salts. Chem. Mater. 2005, 17 (14), 3784-3793.
Aldehydes can be converted to isonitriles via imine formation, catalytic reduction and hypobromite oxidation of the tetrazole ring: Angew. Chem. Int. Ed., 15, 113 (1976): Org. Synth. Coll., 7, 27 (1990):
Gefahrenhinweise (EU): H228-H240-H315-H319-H335
Flammable solid. Heating may cause an explosion. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Keep/Store away from clothing/combustible materials. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. In case of fire: Evacuate area. Fight fire remotely due to the risk of explosion. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.