SCHEDULED MAINTENANCE:
Photocyclisation of 1,3-diphenyl-5-(2′-halogenophenyl)pyrazoles proceeds in high quantum yield from the S0v state followed by homolytic cleavage of the carbon–halogen bond assisted by intramolecular radical complexation whereas that of 1,3-diphenyl-5-(2′-methoxyphenyl)pyrazole proceeds by a different and low quantum yield pathway.
J. Grimshaw and A. P. de Silva, J. Chem. Soc., Chem. Commun., 1979, 193 DOI: 10.1039/C39790000193
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