What is the mechanism of phthalic anhydride and m-xylene which results in 2-(2,4-dimethylbenzoyl) benzoic acid ? include the reaction with alcl3 to form a complex.

Explanation:

Pthalic anhydride on reacts with AlCl₃ forms a complex which on reaction with m-xylene gives 2-(2,4-dimethylbenzoyl) benzoic acid.

The mechanism the reaction follows is:

(a) Image 1.

The mechanism shows the formation of the complex of pthalic anhydride with aluminum chloride. AlCl₃ acts as Lewis base which gets attached to the nucleophilic oxygen of pthalic anhydride.

(b) Image 2.

The attack of the double of m-xylene to the oxygen bearing positive charge of pthalic acid which on protonation gives 2-(2,4-dimethylbenzoyl) benzoic acid.

particle   p is an electron and particle q is a neutron

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