Essay about Esterification and Hydrolysis: Methyl Benzoate by simply Fisher Esterification

Esterification and Hydrolysis: Methyl Benzoate by Fisher Esterification Nitration of Methyl Benzoate

Jingling Li

2/16/2014

Purpose of the experiment: To know the mechanisms for Fisher esterification reactions as an equilibrium method and hydrolysis is the change reaction of esterification. Nitrate methyl benzoate by an electrophilic aromatic alternative reaction. Brief summary of methods: Add sulfuric acid to the mixture of benzoic and methanol, heat up the mixture to 65 occitan. Transfer the mixture to the separatory channel and add ether, sodium bicarbonate and condensed sodium chloride-brine solution, drain the bottom layer each time and remain azure layer. Decant the solution with calcium chloride, then escape the ether by turkish bath, thermal bath and cool-down. The product is usually methyl benzoate. Pour methyl benzoate in cool focused sulfuric acid solution and keep the temperature listed below 10oC. Put concentrated sulfuric acid and nitrite chemical p to the blend and increase temperature to room temp. Pour the perfect solution into snow bath, filtrate the solution wash by methanol. Finally crystallization the product. Chemical substance equations:

Effects:

Percent Yield and the results for esterification:

mols of Benzoic acid sama dengan 10. zero g / 122. 12 (M. W) = zero. 0819 mols

Theoretical produce = 0. 0819 mols * 136. 15 (M. W of Methyl benzoate) = 14. 14g Real collected almost eight. 27 g of the methyl benzoate

Actual yield = 8. 27g / 10. 06g 2. 100% sama dengan 74. 8%

Percent Produce for Nitration:

mols of Methyl Benzoate = 10. 0 g (what all of us started with/from previous week) / 136. 15 (M. W) sama dengan. 0734mols Assumptive yield sama dengan. 0734 * 181. 12-15 (M. Watts of Methyl 3-nitrobenzoate) sama dengan 13. 31g Actual percent yield of crude product = 15. 80g / 12. 33g *100% = 81. 14% Melting level is via 72. 0oC- 77. 2oC.

Conclusion:

The mechanisms of the Fisher esterification reaction can be an balance process that takes place more than a few hours of refluxing. This reaction involves an initial protonation of the carboxyl...



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