Question

Why is this addition of acetyl chloride and AlCl3 done in the presence of DCM Solvent?...

Why is this addition of acetyl chloride and AlCl3 done in the presence of DCM Solvent?

Why was AlCl3 mixed with DCM Solvent before the addition of acetyl chloride (which was also mixed with DCM Solvent before addition)?

Why was 1,2-dimethoxy benzene mixed with DCM before its addition to the AlCl3/Acetyl Chloride mixture?

Why was the benzene compound added slowly to the AlCl3/Acetyl Chloride mixture?

Why were these additions done in a cold environment?

(I already know why its in a water free environment so I dont need to ask)

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Ans 1 :

Friedel craft's acylation reactions are highly exothermic reactions , and both of the reagents used acetyl chloride and aluminium chloride are highly corrosive . AlCl3 which acts as a strong lewis acid reacts with moist air giving off hydrogen chloride gas , so more than the stoichiometric amount of AlCl3 is required in the reaction and solvents such as DCM ( dichloro methane ) and carbon sulfide are used representing environmenatal and human health risks.

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