The Carboxylic acids can be made up using the diverse methods.
Oxidation of Primary Alcohols and Aldehydes or ketones:
The Oxidation of primary alcohols and aldehydes or ketones provides carboxylic acids.
Fig: Oxidation of Primary Alcohols and aldehydes
The alcohol is heated under reflux with surplus oxidizing potassium dichromate (VI) or manganese (VII). The acid is separated from the reaction mixture.
CH3 CH OH + (K2Cr2O7/H+) reflux → CH3 CHO + (K2Cr2O7/H+) reflux → CH3COOH
Benzoic acid can be made up from the oxidation of alky benzenes by using the acidified potassium tetraoxomanganate (vii) as the oxidizing agent.
Fig: Preparation of Benzoic acid
This reaction will merely be possible if 'R' is methyl or other alkyl group however not 3o alkyl groups.
From Grignard's Reagent and CO2:
This process is especially employed for the preparation of fatty acids.
Fig: Grignard's Reagent
Hydrolysis of Nitriles:
The hydrolysis of nitriles, R - C = N, in the acidic or alkaline medium provide carboxylic acids.
Fig: Hydrolysis of Nitriles
The reaction comprises the formation of an amide as the intermediate which is further hydrolyzed to a carboxylate. The carboxylate reacts by a dilute mineral acid to form the carboxylic acid.
Hydrolysis of Esters (Saponification):
The hydrolysis of esters might be accomplished through boiling under reflux with concentrated aqueous sodium hydroxide.
Fig: Hydrolysis of Esters
This reaction is only undergone through aromatic aldehydes and those aliphatic ones having no α-hydrogen atoms.
2C6H5CHO + NaOH → C2H5COONa+ + C6H5CH2OH
If an appropriate aldehyde is treated by a concentrated aqueous solution of alkali at room temperature, it experiences simultaneous oxidation and reduction to yield the suitable salt of the carboxylic acid and an alcohol.
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