The synthesis of ibuprofen from 2-methylpropylbenzene isobutylbenzene and carbon dioxide can be achieved through a series of reactions. Here is a step-by-step reaction mechanism:1. Friedel-Crafts Alkylation:First, we need to introduce a carbonyl group to the isobutylbenzene. This can be done through Friedel-Crafts acylation, using acetyl chloride CH3COCl and aluminum chloride AlCl3 as a catalyst.- Isobutylbenzene + CH3COCl in the presence of AlCl3 2- 4-isobutylphenyl propanoyl chloride2. Hydrolysis:Next, we need to convert the acyl chloride to a carboxylic acid. This can be done through hydrolysis.- 2- 4-isobutylphenyl propanoyl chloride + H2O 2- 4-isobutylphenyl propanoic acid3. Kolbe-Schmitt Reaction:Now, we need to introduce a second carboxylic acid group to the molecule using the Kolbe-Schmitt reaction. This involves treating the 2- 4-isobutylphenyl propanoic acid with carbon dioxide CO2 and a strong base like sodium hydroxide NaOH under high pressure and temperature.- 2- 4-isobutylphenyl propanoic acid + CO2 + NaOH sodium 2- 4-isobutylphenyl -propionate + H2O4. Acidification:Finally, we need to convert the sodium salt of the carboxylic acid back to the free carboxylic acid, which is ibuprofen. This can be done by acidification using a strong acid like hydrochloric acid HCl .- Sodium 2- 4-isobutylphenyl -propionate + HCl ibuprofen 2- 4-isobutylphenyl propionic acid + NaClIn summary, the synthesis of ibuprofen from 2-methylpropylbenzene and carbon dioxide involves Friedel-Crafts acylation, hydrolysis, Kolbe-Schmitt reaction, and acidification.