Here's a breakdown of the reaction:
Reaction:
C₆H₅COOH + CH₃CHOHCH₃ ⇌ C₆H₅COOCH(CH₃)₂ + H₂O
Mechanism:
1. Protonation of the alcohol: The acid catalyst (e.g., sulfuric acid) protonates the 2-propanol, making it a better leaving group.
2. Nucleophilic attack: The oxygen of the carboxyl group in benzoic acid acts as a nucleophile and attacks the protonated 2-propanol.
3. Proton transfer: A proton is transferred from the oxygen of the alcohol to the carboxyl group.
4. Elimination of water: Water is eliminated from the molecule, forming the isopropyl benzoate ester.
Conditions:
* Acid catalyst: An acid catalyst like sulfuric acid is required to facilitate the reaction.
* Heat: The reaction is usually carried out under reflux conditions (heating the mixture to its boiling point) to drive the equilibrium towards the product side.
* Removal of water: Removing the water formed as a byproduct can further shift the equilibrium to the product side.
Product:
Isopropyl benzoate is a pleasant-smelling liquid commonly used in perfumes and flavorings.
Note:
The reaction is reversible, so some benzoic acid and 2-propanol will remain in equilibrium with the product. To maximize the yield of the ester, you can use an excess of one of the reactants or remove the water formed.
