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Electrophilic Aromatic Substitution

=>. Electrophilic Aromatic Substitution. Electrophile substitutes for a hydrogen on the benzene ring. Mechanism. =>. Energy Diagram for Bromination. =>. Bromination of Benzene. Requires a stronger electrophile than Br 2 . Use a strong Lewis acid catalyst, FeBr 3. =>.

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What happens when there is a substituent already present? Where does the second substitution go?

What happens when there is a substituent already present? Where does the second substitution go? Is the attack by the second electrophile directed, or is its approach strictly random?. In order to answer this kind of question, let us examine two typical examples:. The Nitration of Anisole.

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Directing groups

Directing groups. What are directing groups?. Substitution of a 2 nd group on a benzene ring The 1 st group directs the position of the 2 nd substituted group Two types 2? and 4?directing groups activate the ring: reactivity increases

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Directing groups - PowerPoint PPT Presentation

Electrophilic Aromatic Substitution

What happens when there is a substituent already present? Where does the second substitution go?

Directing groups