Hageman, H.J. and Oosterhoff, P. and Verbeek, J. (1999) Photoinitiators and photoinitiation - Part 15. The photodecomposition of some [Z] O-sulphonyl 2-oximinoketones and some [Z] O-sulphamoyl 2-oximinoketones. Journal of Photochemistry and Photobiology a-Chemistry, 121 (3). pp. 207-211. ISSN 1010-6030.
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The photodecomposition of some [Z]-O-sulphonyl 2-oximinoketones is studied by ESR spectroscopy At low temperatures (T < -70 degrees C), alpha-ketoiminyl radicals are observed, indicative of initial N-O bond cleavage, implying that O-sulphonyl land O-sulphamoyl) fragments are split off as sulphonyloxy land 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 alpha-ketoiminyl radical. The title compounds are shown to photoinitiate the polymerization of acrylates and to photoinduce the acid-catalyzed crosslinking of a melamine resin.
|Uncontrolled keywords:||z] O-sulphonyl 2-oximinoketones; [Z] O-sulphamoyl 2-oximinoketones; photodecomposition; alpha-ketoiminyl radicals|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||I.T. Ekpo|
|Date Deposited:||13 Sep 2009 16:04|
|Last Modified:||13 Sep 2009 16:04|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/16828 (The current URI for this page, for reference purposes)|
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