Question

Write the naming reaction Friedel craft alkylation reaction

Answer 1

Answer:

C6H6 +  R-Cl   →AlCl3→ C6H5-R + HCl

Explanation:

• Friedel-Crafts Alkylation of Benzene :
• Reaction type: Electrophilic Aromatic Substitution
• Overall transformation :  Ar-H to Ar-R
• Named after Friedel and Crafts who discovered the reaction in 1877.
• Reagent : normally the alkyl halide (e.g. R-Br or R-Cl) with aluminum trichloride, AlCl3, a Lewis acid catalyst.
• Electrophilic species : the carbocation (i.e. R +) formed by the "removal" of the halide by the Lewis acid catalyst
• The carbocation then attacks the benzene ring here a H is taken by the Cl [anion] formed the carbocation formed attacks the benzene ring there
• The reactive electrophile, the carbocation is prone to rearrangement to a more stable carbocation which will then undergo the alkylation reaction.
• =>The halide must be an alkyl halide.
• Vinyl or aryl halides do not react  as their intermediate carbocations are too unstable.

Answer 2

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Friedel-Craft's alkylation reaction : When an aromatic hydrocarbon is treated with an acid chloride in the presence of anhydrous aluminium chloride, and allyl hydrocarbon is produced.

This reaction is called Friedel-Craft's reaction.