Friedel crafts reaction of bromobenzene with methyl chloride gives

The Friedel-Crafts reaction is a type of organic reaction that involves the substitution of an aromatic ring with an alkyl or acyl group. In this case, we are looking at the reaction of bromobenzene with methyl chloride.

Step 1: Preparation of the Lewis acid catalyst To carry out the Friedel-Crafts reaction, we need a Lewis acid catalyst. One commonly used catalyst is aluminum chloride (AlCl3). It can be prepared by dissolving aluminum chloride in anhydrous solvent, such as dichloromethane or chloroform.

Step 2: Activation of the Lewis acid catalyst The Lewis acid catalyst needs to be activated before it can react with the reactants. This can be done by adding a small amount of the catalyst to the solvent and allowing it to react with a small amount of the reactant, in this case, bromobenzene. The reaction is typically carried out under anhydrous conditions to prevent unwanted side reactions.

Step 3: Addition of the reactants Once the catalyst is activated, the reactants can be added to the reaction mixture. In this case, methyl chloride is added to the reaction mixture containing the activated catalyst and bromobenzene. The reaction is typically carried out at a low temperature to control the reaction rate and minimize side reactions.

Step 4: Reaction and formation of the product The reaction between bromobenzene and methyl chloride proceeds through an electrophilic aromatic substitution mechanism. The Lewis acid catalyst activates the electrophile (methyl chloride) by coordinating with it, making it more reactive towards the nucleophilic aromatic ring (bromobenzene). The reaction results in the substitution of the bromine atom in bromobenzene with the methyl group from methyl chloride, forming the product.

Step 5: Workup and purification After the reaction is complete, the reaction mixture is typically quenched with a suitable reagent, such as water or a weak acid, to deactivate the catalyst and neutralize any remaining reactants or byproducts. The product can then be isolated and purified using techniques such as filtration, distillation, or chromatography.

It is important to note that the Friedel-Crafts reaction can have limitations and side reactions, such as rearrangements or multiple substitutions. Reaction conditions and choice of catalyst can influence the selectivity and yield of the desired product.