How Do You Prepare Benzoic Acid Using The Grignard Reagent?
Benzoic acid (C6H5COOH) is a white, crystalline solid at room temperature. It’s a weak organic acid that may be used in a variety of reactions to synthesize other compounds. Benzoic acid may be prepared from an alkyl magnesium halide in a reaction known as the Grignard reaction. The Grignard reaction is a very common type of synthesis pathway to use when the end product requires the formation of carbon-carbon bonds. Step 1 Summarize the Grignard reaction. The Grignard reaction is a two-step reaction that may be shown as follows: R1-MgBr + R2R3=O -> R1R2R3OMgBr R1R2R3O-MgBr + H20 -> R1R2R3OH + MgBrOH In these equations, R1, R2 and R3 are organic groups. Step 2 Apply the Grignard reaction to the synthesis of benzoic acid. The specific Grignard reaction for benzoic is as follows: C6H5-MgBr + O=C=O -> C6H5COO-MgBr C6H5COO-MgBr + H2O -> C6H5COOH + MgBrOH In this example, R1 is C6H5COO-, R2 is O and R3 is C. Therefore, the Grignard reagent in this reaction is phenyl magnesium bromide. Step 3
