Preparation Of Benzilic Acid From Benzil 6w4x5
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BS (Hons) 2nd Semester
Organic Chemistry Practical Manual
Experiment Title: Preparation of benzilic acid from benzil. Chemicals required Benzil KOH or NaOH Conc. HCl
1g 1g
Reaction
Mechanism
Procedure Benzil (1 g) was thoroughly grounded with solid NaOH or KOH (1 g) in a dry mortar with the help of a pestle to make an easy flowing powder. This material was subsequently taken in a dry conical flask fitted with a piece of cotton at its mouth and heated on a boiling water bath for 20 minutes. Then it was cooled to room temperature, dissolved in minimum amount of water (unreacted benzil, if any, was removed simply by filtration) and the aqueous solution was acidified with conc. HCl with thorough cooling in ice. The precipitated benzilic acid was filtered, washed with cold water and crystallized from hot water, if needed. Result Yield Melting point
0.86 g (80%) 149-151 oC
1 Dr. Muhammad Aslam Assistant Professor-Chemistry University of Education, Township Campus, Lahore.
Organic Chemistry Practical Manual
Experiment Title: Preparation of benzilic acid from benzil. Chemicals required Benzil KOH or NaOH Conc. HCl
1g 1g
Reaction
Mechanism
Procedure Benzil (1 g) was thoroughly grounded with solid NaOH or KOH (1 g) in a dry mortar with the help of a pestle to make an easy flowing powder. This material was subsequently taken in a dry conical flask fitted with a piece of cotton at its mouth and heated on a boiling water bath for 20 minutes. Then it was cooled to room temperature, dissolved in minimum amount of water (unreacted benzil, if any, was removed simply by filtration) and the aqueous solution was acidified with conc. HCl with thorough cooling in ice. The precipitated benzilic acid was filtered, washed with cold water and crystallized from hot water, if needed. Result Yield Melting point
0.86 g (80%) 149-151 oC
1 Dr. Muhammad Aslam Assistant Professor-Chemistry University of Education, Township Campus, Lahore.
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