Photochemical synthesis of 1,2,4-triazoles via addition reaction of triplet intermediates to diazoalkanes and azomethine ylide intermediates

Photoexcitation of the azodicarboxylates results in a radical addition reaction with diazoalkanes and formation of an azomethine ylide to allow for dipolar cycloaddition reaction with nitriles to give a 1,2,4-triazole.