Coca, Adiel published the artcilePreparation of 5-substituted 1H-tetrazoles catalyzed by scandium triflate in water, SDS of cas: 2251-79-8, the publication is Synthetic Communications (2015), 45(2), 218-225, database is CAplus.
Several 5-substituted 1H-tetrazoles I (R = 4-O2NC6H4, 4-BrC6H4, 4-ClC6H4, etc.) were prepared in water or isopropanol/water mixtures using microwave heating. Good yields were obtained for the [2 + 3] cycloaddition of sodium azide with aryl nitriles, aliphatic nitriles, and vinyl nitriles when catalyzed by scandium triflate. The reactions were typically heated for 1h at 160°C in a 3:1 isopropanol/water mixture to obtain the best yields.
Synthetic Communications published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is C8H5F3N4, SDS of cas: 2251-79-8.
Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem