Abstract
Since ESR spectroscopists started to use the halocarbon matrix isolation technique about a decade ago to study radical cations, many unstable intermediates have been characterised [1]. Most notable in this context are perhaps the radical cations of saturated organic compounds. The radical cations of alkanes have their semi occupied molecular orbital (SOMO) confined into σ-bonds which can be extended over several carbons in the molecular framework. As a result, such bonds are weakened and elongated. The presence of a heteroatom in a saturated system gives a SOMO which involves the lone-pair orbital(s). In such cases, the radical cations usually have a π-type character, and the unpaired electron delocalises to hydrogens on the adjacent carbons via hyperconjugation.
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Lindgren, M., Shiotani, M. (1991). ESR Studies of Radical Cations of Cycloalkanes and Saturated Heterocycles. In: Lund, A., Shiotani, M. (eds) Radical Ionic Systems. Topics in Molecular Organization and Engineering, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3750-8_5
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