Prepare chlorobenzene by starting with bromobenzene. You can use any other reagent and try to do this organic conversion question below four steps. During this conversion, you will prepare phenyl magnesium bromide as a grignard reagent.
Bromine and chlorine atoms are substituted to benzene and they are alkyl halide compounds. Bromobenzene and chlorobenzene have similar reactions and physical properties. In this question, we are going to replace the bromine atom by chlorine atom. But this has to be done in several steps.
When benzene is treated with Cl2 in the presence of anhydrous AlCl3, chlorobenzene is given as the product.
So, we have to prepare benzene from bromobenzene.
Most easy way to convert bromobenzene to benzene is the preparation of grignard reagent from bromobenzene and hydrolysis of it. It is one of the benzene preparing methods when we have an halogen substituted benzene.
Bromobenzene reacts with Mg, dry ether to prepare phenyl magnesium bromide.
Add water to phenyl magnesium bromide, it gives benzene as the main product and MgBr(OH). Benzene is separated and send to the next step.
Read MSDS (material safety data sheets) to know the toxicity and health issued can be occurred due to use of chemicals in this organc conversion.
Flammable liquid and vapor. Harmful if inhaled. Toxic to aquatic life.
Flammable liquid and vapor.May be absorbed through intact skin. Marine pollutant.
As bromobenzene to chlorobenzene, do the grignard preparation and hydrolysis. Only change is, benzene should be treated with Br2 in the presence of AlBr3.
As mentioned earlier, bromobenzene and chlorobenzene have similar reaction with magnesium in ether medium.
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