Effect of Acetic Acid on the Oxidation of Mandelic Acid by Manganese(III) Pyrophosphate
| Main Authors: | S. L. OSWAL, (Miss) K. G. PATHAK |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1984
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6327504 |
Daftar Isi:
- Department of Chemistry, South Gujarat University,Surat-895 007 Manuscript received 17 April 1982, revised 3 January 1983,accepted 27 October 1983 OXIDATION of mandelic acid (MA) has been investigated by different workers using several oxidizing agents. The kinetics of oxidation of MA by cerium(IV)1-3 vanadium(V)4- 6 , manganese(III)7, peroxydisulphate8 and bromine9 has been studied in aqueous acidic media, and by chromic acid10-13 both in aqueous acidic media and in acetic acid-water binary mixtures. However, no data seems to have been reported on the kinetics of oxidation of MA by manganese(III) pyrophosphate. Manganese(III) pyrophosphate is a good selective one electron oxidant towards organic compounds. It has been widely used by Waters and coworkers14 to study the kinetics and mechanism of the oxidation of a variety of organic substrates. The investigations of Waters and coworkers were carried out in aqueous acidic medium, but as many organic compounds are insoluble in water their oxidation kinetics cannot be investigated in aqueous medium. One has to use other solvents like acetic acid, dioxane, acetonitrile, etc. Bakore and Narain10 had reported rate enhancement due to acetic acid in the oxidation of MA by chromic acid while our preliminary experiment showed retardation in the rate of oxidation due to the presence of acetic acid in reaction mixture for the oxidation of MA by manganic pyrophosphate. It was therefore, thought worthwhile to investigate in detail the oxidation of mandelic acid by manganese(III) pyrophosphate in acetic acid-water binary mixtures of different compositions with a view to gaining insight into the mechanism of oxidation and role of acetic acid as a solvent. The effcct of other solvent like dioxane has also been studied.