Asked by: Sevdalin Morandeira
asked in category: General Last Updated: 25th February, 2020

Why is freshly distilled aniline always preferred in the synthesis of Acetanilide?

Freshly distilled aniline should be used in order to get good results or small amount of zinc can be added in the reaction mixture. Zinc reduces the coloured impurities in the aniline and also prevents its oxidation during the reaction. 2. Prolonged heating and use of excess of acetic anhydride should be avoided.

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Also question is, what is the purpose of acetanilide in the preparation?

Acetanilide is used as an inhibitor of hydrogen peroxide decomposition and is used to stabilize cellulose ester varnishes. It has also found uses in the intermediation in rubber accelerator synthesis, dyes and dye intermediate synthesis, and camphor synthesis.

how is Acetanilide prepared from aniline? Acetanilide is prepared from aniline when it reacts with acetic anhydride/glacial acetic acid in the presence of zinc dust. A mixture of aniline, glacial acetic acid, acetic anhydride and zinc dust is refluxed under anhydrous condition and then poured the mixture into ice cold water to get acetic anhydride precipitate.

Considering this, why glacial acetic acid is used in preparation of Acetanilide from aniline?

Glacial acetic acid is used because it is an excellent polar protic solvent capable of dissolving acetanilide. For the process, acetanilide is first dissolved in the solvent, glacial acetic acid, by warming.

What should be done if Acetanilide is Coloured?

If the solution is coloured, add a small amount of decolourising charcoal, swirl the flask for about one minute, and filter off the carbon using a fluted filter paper (see the Appendix). In a separate container dissolve 3 g sodium acetate in 10 mL water.

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