Kinetics and mechanism of oxidation of hydroxy acids by pyridinium hydrobromide perbromide
IR@NISCAIR: CSIR-NISCAIR, New Delhi - ONLINE PERIODICALS REPOSITORY (NOPR)
View Archive Info| Field | Value | |
| Title |
Kinetics and mechanism of oxidation of hydroxy acids by pyridinium hydrobromide perbromide
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| Creator |
Aparna, P
Kothari, Seema Banerji, Kalyan K |
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| Description |
1086-1088
The oxidation of glycollic, lactic, mandelic and malic acids by pyridinium hydrobromide perbromide (PHPB) in acetic acid water mixture (3:7, v/v) leads to the formation of corresponding oxoacids. The reaction is first order each in PHPB . nd the hydroxy acid. Addition of pyridinium hydrobromide does not affect the rate indicating that PHPB itse fis the reactive oxidizing species. The oxidation of ɑ-deutriomandelic acid shows the presence of a primary kinetic isotope effect (<em>k</em><sub>H</sub>/<em>k</em><sub>D</sub> = 5.07). The reaction does not exhibit solvent isotope effect (<em>k</em>(H<sub>2</sub>O)/<em>k</em>(D<sub>2</sub>O) = 1.011. The rate decreases with an increase in acetic acid content in the solvent mixture. A mechanism involving hydride ion transfer to the oxidant is proposed. |
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| Date |
2018-03-26T08:30:43Z
2018-03-26T08:30:43Z 1993-12 |
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| Type |
Article
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| Identifier |
0975-0975(Online); 0376-4710(Print)
http://nopr.niscair.res.in/handle/123456789/44076 |
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| Language |
en_US
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| Rights |
<img src='http://nopr.niscair.res.in/image/cc-license-sml.png'> <a href='http://creativecommons.org/licenses/by-nc-nd/2.5/in' target='_blank'>CC Attribution-Noncommercial-No Derivative Works 2.5 India</a>
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| Publisher |
NISCAIR-CSIR, India
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| Source |
IJC-A Vol.32A(12) [December 1993]
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