Lecture Notes on Electrophilic Aromatic Substitution

Mechanistic Principles of ElectrophilicAromatic Substitution

Step1: Breaks aromaticity of ring
  • High Eact
  • Rate determining step
Step2: Rearomatizes ring
  • Relatively low Eact
  • Fast step
Each EAS reaction will have one or more pre-steps in which a sufficiently electrophilic species is generated.

The electrophile for the reaction is shown in the lower left-hand corner of the slide.

Direct suggestions, comments, and questions about this page to Arlene Courtney, courtna@wou.edu.
Last Modified February 12, 1998

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