Electrochemistry of electron transfer probes. The role of the leaving group in the cleavage of radical anions of α-aryloxyacetophenones.

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DOIResolve DOI: http://doi.org/10.1021/ja954093+
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TypeArticle
Journal titleJACS: Journal of the American Chemical Society
Volume118
Pages48714879; # of pages: 1
AbstractThe formal reduction potential (E°) of α-phenoxyacetophenone has been determined from the voltammetric peak potential obtained by linear sweep voltammetry in combination with the rate constant for fragmentation of the radical anion which had been determined by laser flash photolysis. The E° values of a number of α-aryloxyacetophenones were then estimated from a correlation of the ¹³C chemical shifts of the carbonyl carbon and a similar correlation (E° versus ¹³C chemical shift) within a series of substituted α-anilinoacetophenones. Using these potentials (which vary by only 34 mV over a wide range of substituents) the rate constants for fragmentation of the α-aryloxyacetophenone radical anions were determined from digital simulation of the corresponding voltammetric waves. The fragmentation rate constants were shown to correlate with the pKₐ of the corresponding phenols. However, the kinetic range was too small and the experimental errors too large to allow a distinction between a linear and quadratic free energy dependence. A thermochemical analogy between the leaving group ability in reactions of radical anions and that in simple heterolysis of closed shell compounds is developed. The utility of these compounds as potential electron transfer probes is discussed.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12338066
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Record identifier42215396-cb19-4f14-ae62-bec5b8653217
Record created2009-09-10
Record modified2016-05-09
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