The missing link between conventional SN1 reactions and the chemistry of stable carbocations has been found. When water is added to the colorless solution of the covalent compound Ar2CH-OAc (Ar=morpholinophenyl) in acetone, the appearance and disappearance of the intermediate carbocation ArCH+ can be observed with the naked eye!
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Schaller et al. (2008) studied this question.
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