Abstract
The photodecomposition of some [Z]- O-sulphonyl 2-oximinoketones is studied by ESR spectroscopy. At low temperatures ( T < −70°C), α-ketoiminyl radicals are observed, indicative of initial N–O bond cleavage, implying that O-sulphonyl (and O-sulphamoyl) fragments are split off as sulphonyloxy (and sulphamoyloxy) radicals in much the same way as acyloxy radicals in the case of O-acyl 2-oximinoketones studied before. At room temperature in the presence of a spin-trap, the trapped benzoyl radical is observed, which must have been formed by fragmentation of the α-ketoiminyl radical. The title compounds are shown to photoinitiate the polymerization of acrylates and to photoinduce the acid-catalyzed crosslinking of a melamine resin.
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