Problem: p-Fluoroanisole reacts with sulfur trioxide and sulfuric acid. Draw the major product of this substitution reaction; if applicable, minimize formal charges via expanded octets. Assume 1 equivalent of reagents is used.

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We are asked to draw the major product of this reaction.


Benzene derivative + SO3, H2SO4 → EAS Sulfonation → Product: Benzene-SO3H

  • Subtituent : F → Halogen → Weak Deactivator → o,p - director
  • Subtituent : O-CH3 → O-R → Strong Activator → o,p - director


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Problem Details

p-Fluoroanisole reacts with sulfur trioxide and sulfuric acid. Draw the major product of this substitution reaction; if applicable, minimize formal charges via expanded octets. Assume 1 equivalent of reagents is used.