Abstract
The nucleophilic substitution is an heterolytic reaction of the type
Y is called the nucleophile (usually an anion or a neutral base), X is called the leaving group. The atom which undergoes the substitution (usually a carbon atom in what follows) is called the electrophilic center. Two mechanisms are generally considered for the nucleophilic substitutions 1:
the SN1 unimolecular substitution, which takes place in two steps:
the first step corresponding to a slow and reversible dissociation to a cationic species. This mechanism usually leads to the racemization of an optically active substrate.
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Dedieu, A., Veillard, A. (1979). Theoretical Studies of SN2 Reactions. In: Daudel, R., Pullman, A., Salem, L., Veillard, A. (eds) Quantum Theory of Chemical Reactions. Quantum Theory of Chemical Reactions, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9516-1_4
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