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Question
What will be the major product for the following reaction?
What will be the major product for the following reaction?
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Solution
The correct option is C
Friedel Crafts Alkylation:
In this reaction, one H-atom of the ring get replace by alkyl group. The attacking electrophile is an alkyl carbocation (R+) made available by the reaction of alkyl halide and an anhydrous lewis acid.
Mechanism:
Step 1: Formation of electrophile
Isobutyl chloride react with anhydrous lewis acid AlCl3 to form a less stable primary carbocation. Then it undergoes 1, 2 H-shift to form a stable tertiary carbocation which acts as an electrophile.
Step 2: Formation of arenium ion
Now, benzene attacks the stable tertiary carbocation to form arenium ion.
Step 3: Removal of H+ from arenium ion to form the product
Thus, the product formed after friedel-crafts alkylation of benzene is tert-Butylbenzene.
Friedel Crafts Alkylation:
In this reaction, one H-atom of the ring get replace by alkyl group. The attacking electrophile is an alkyl carbocation (R+) made available by the reaction of alkyl halide and an anhydrous lewis acid.
Mechanism:
Step 1: Formation of electrophile
Isobutyl chloride react with anhydrous lewis acid AlCl3 to form a less stable primary carbocation. Then it undergoes 1, 2 H-shift to form a stable tertiary carbocation which acts as an electrophile.
Step 2: Formation of arenium ion
Now, benzene attacks the stable tertiary carbocation to form arenium ion.
Step 3: Removal of H+ from arenium ion to form the product
Thus, the product formed after friedel-crafts alkylation of benzene is tert-Butylbenzene.
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