Abstract
Pentafluoronitrosobenzene reacts readily with aniline and with p-methoxyaniline to give the corresponding 2,3,4,5,- 6-pentafluoroazobenzenes (1a and 1b) in good yield. Minor components detected by n.m.r, spectroscopy in the analytically pure products are shown by a combination of lanthanide-induced shift studies and photochemical reactions to be the cis -azo compounds these cis -azo compounds are unusually stable in the dark, with half lives ranging from 19h to > 100 days at room temperature.
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