The fragmentation of 1 is up to 1020 times faster if it is present as radical ion and not as neutral compound. This acceleration has thermodynamic reasons, which surprisingly lead almost exclusively to a lowering of the energy of the transition state, even for weakly endergonic processes. The term (catio-/anio) mesolytic is proposed for the fragmentations of radical ions.
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Maslak et al. (1990) studied this question.
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