ChemInform Abstract: Pyrolysis and Photolysis of 1‐Aroylamino‐4,5‐diaryl‐1,2,3‐triazoles: Generation and Thermal Transformations of 4,5‐Diaryl‐1,2,3‐triazolyl Radicals.

Abstract

Pyrolysis and Photolysis of 1-Aroylamino-4,5-diaryl-1,2,3-triazoles: Generation and Thermal Transformations of 4,5-Diaryl-1,2,3-triazolyl Radicals. -The pyrolysis of the triazole systems (I), (IX), and (XII) yields the imidazoles (II), (X), and (XIII) and azirine (III) as main products. It is assumed that heating of the triazoles leads to the homolytic cleavage of the weak exocyclic N-N bond with the concomitant formation of the triazolyl radical and the aroylamino radical. In the photolysis experiment a similar fragmentation pattern is realized which also supports the photoinduced elimination of the triazole group by means of the triazolyl radical.-(HADJIANTONIOU-MAROULIS, C. P.; CHARALAMBOPOULOS, A. PH.; MAROULIS, A. J.;