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Springer
Spin Trapping by Nitrosoalkanes: Mechanisms of Some Photochemically Induced Reactions
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This thesis is based on the excellent radical scavenging properties of mono- meric nitrosoalkanes RNO. Thus, addition of a small amount of RNO to a reacting system in which unstable radicals X- are generated usually results in the formation of relatively stable nitroxides, which can be studied by ESR spectroscopy at room temperature . . R-N=O + X --R-N-X, . o The nature of the trapped radical X- can very often be deduced from the hyperfine splittings (hfs) and g-value of the ESR spectrum of the derived nitroxide. Thus the ESR Spin Trapping technique is useful for the identifi- cation of highly reactive (short-living) radicals X-. Chapter 1 contains a survey of the literature and a short description of the most important features of nitrosoalkanes, nitroxides and the Spin Trapping technique in general. In chapter 2 the synthesis of hitherto unknown I-nitrosoadamantane is described. Together with a number of other nitrosoalkanes it is used as a scavenger for trifluoromethyl radicals, generated by photolysis of trifluoro- iodomethane. The derived alkyl trifluoromethyl nitroxides with aN = aF = 11.5-12.0 gauss are easily identified and are found to be very stable at room temperature. Chapter 3 illustrates the limitations of the Spin Trapping technique, i.e.
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