The book began with chemistry that is by no means uncommon, but the bulk of organic chemistry has and continues to be based on two electron processes. Substitution reactions comprise one class of reactions involving such chemistry. Addition reactions comprise the other. You should have been introduced to both by now.
CITATION STYLE
Bruckner, R. (2010). Nucleophilic Substitution Reactions at the Saturated C Atom. In Organic Mechanisms (pp. 53–101). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-03651-4_2
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