Nucleophilic attack by pi electrons on an tetrahedral carbon electrophile can occur in an S N 1-like or S N 2-like fashion, and pi bonds can also attack carbonyl carbons in what is essentially an elec...Nucleophilic attack by pi electrons on an tetrahedral carbon electrophile can occur in an S N 1-like or S N 2-like fashion, and pi bonds can also attack carbonyl carbons in what is essentially an electrophilic variation on the carbonyl addition (chapter 11) mechanism. If the pi bond in question is part of an aromatic system, the reaction is referred to as an electrophilic aromatic substitution.
