INVESTIGATION OF THE MECHANISM OF THE OXIDATION OF PYRUVIC ACID, PHENOL, AND SALICYLALDEHYDE BY HYDROGEN PEROXIDE WITH THE HELP OF ISOTOPES (in German)
Journal Article
·
· Kernenergie (East Germany)
OSTI ID:4764854
Labeling with O/sup 18/ permitted the following results to be obtained: In the reaction of hydrogen peroxide with pyruvic acid, the CO/sub 2/ formed originates from the carboxyl group, whereas the carbonyl group from which is formed acetic acid is oxidized to the carboxyl group. This reaction passes through the intermediate stage of an oxyhydroperoxide, its rearrangement to the mixed anhydride of acetic and carbonic acids and the hydrolysis of the latter with splitting of the oxygen-carboxyl bond. The oxidation of benzoyl formic acid with hydrogen peroxide follows the same mechanism. In the oxidation of salicylaldehyde and m-methoxysalicylaldehyde with hydrogen peroxide, the second hydroxyl group of pyrocatechin being formed originates from the hydrogen peroxide. The mechanism is analogous to the previous reaction: oxyhydroperoxide formation, its rearrangement, and hydrolysis with splitting of the acid-formyl bond. In the oxidation of phenol with hydrogen peroxide in acetic solution or with Fenton reagent, the pyrocatechin also contains the hydroxyl group of the hydrogen peroxide. In the oxidation of phenol with persuifate, the monsulfuric acid ester formed is hydrolyzed by splitting of the O-S bond. In all hydroxylation reactions studied, the free hydroxyl ridicals participate not as hydroxylation media in opposition to widely disseminated opinions. (tr-auth)
- Research Organization:
- Inst. of Physics and Chemistry, Kiev
- NSA Number:
- NSA-17-002710
- OSTI ID:
- 4764854
- Journal Information:
- Kernenergie (East Germany), Journal Name: Kernenergie (East Germany) Vol. Vol: 5; ISSN KERNA
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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