Miura, Tomoya published the artcileRegioselective 1,3-Dipolar Cycloaddition of Nitriles with Nitrile Imines Generated from Tetrazoles, Quality Control of 2251-79-8, the publication is Chemistry Letters (2021), 50(1), 131-135, database is CAplus.
A synthesis of 3,5-disubstituted-1,2,4-triazoles from nitriles and 5-aryltetrazoles was reported. When 5-aryltetrazoles were triflylated in the presence of nitriles, the resulting 5-aryl-2-triflyltetrazoles thermally generated N-triflyl-nitrile imines through a sequence of ring-chain tautomerization and denitrogenation. The N-triflyl-nitrile imines immediately underwent 1,3-dipolar cycloaddition with nitriles in a regioselective manner, forming the corresponding 1,2,4-triazoles.
Chemistry Letters 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, Quality Control of 2251-79-8.
Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem