Abstract
This chapter reviews electron transfer reactions that arise from direct photochemical excitation of carbanions and carbocations or from carbanions and carbocations generated via an initial photochemical reaction. The types of carbanions and carbocations treated will be primarily (but not restricted to) those with hydrocarbon frameworks. Electron transfer from photoexcited iminium and onium ions and related compounds (which are formal carbocations) are not included since these reactions are discussed in chapters 1.7 and 1.8 of this monograph, respectively. This chapter has two principal sections for the two types of intermediates under review. Each section will begin with a consideration of the excited states available and reasons as to why the excited states of these species might be expected to undergo electron transfer reactions. This will be followed by a discussion of examples from the literature classified under their structural type.
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