Scheme 18. (a) Photoredox catalysed 1-amino-1,2,3-triazole formation by α-diazo sulfonium salts and hydrazones. (b) Proposed mechanism of the 1-amino-1,2,3-triazole formation. (c) Utility as mesoionic 1-amino-1,2,3-triazol-4-ylidene ligands.
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