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Topic: Hydration inactivating FeBr3 in Electrophilic Aromatic Substitution  (Read 7400 times)

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Offline zeoblade

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Hydration inactivating FeBr3 in Electrophilic Aromatic Substitution
« on: May 20, 2011, 10:08:32 PM »
In a section on halogenation of benzene, a question asks, "why does hydration inactivate FeBr3?"

Maybe I can't understand what they are asking. Are they asking to add water to benzene? Or hydrating FeBr3?

Water coordinating to Fe as a ligand will inactivate FeBr3 to catalyse halogenation of benzene?
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Offline Schrödinger

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Re: Hydration inactivating FeBr3 in Electrophilic Aromatic Substitution
« Reply #1 on: May 21, 2011, 02:23:27 AM »
Well, I'm guessing that H2O, as you said binds to FeBr3, which is a Lewis acid, and prevents breakdown of the Br-Br bond.
    Br2 + FeBr3 = Br+ + [FeBr4]-
   The above reaction might not occur due to the absence of FeBr3

Please correct me if I'm wrong.

 
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