Liquid-phase catalytic oxidation of methyl derivatives of biphenyl
| Autor: | G. N. Koshel, N. V. Lebedeva, E. A. Kuznetsova, M. V. Postnova, T. A. Yun’kova, M. S. Belysheva, S. G. Koshel |
|---|---|
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Kinetics and Catalysis. 45:821-825 |
| ISSN: | 1608-3210 0023-1584 |
| Popis: | Liquid-phase catalytic oxidation into acids by air was studied for the following hydrocarbons: isomers of cyclohexyltoluenes and cyclohexyl derivatives of para-xylene, mesitylene, pseudocumene, cyclopentyltoluene, cyclohexyladamantane, 4-methylbiphenyl, 2,4-, 2,5- and 3,4-dimethylbiphenyls, hydroxymethylbiphenyls, and hydroxymethylbenzenes. The oxidation of cyclohexyltoluenes involves a methyl group and proceeds without participation of the α-CH bond of the cyclohexyl fragment in the oxidative conversions. The reactivity of the hydrocarbons increases in the order ortho < meta < para. Consecutive conversions of the methyl groups to carboxyls occur during the oxidation of dimethylbiphenyls. In 3,4- and 2,5-dimethylbiphenyls, the methyl groups in the para and ortho positions, respectively, are first oxidized, whereas the reactivity of both of the methyl groups in 2,4-dimethylbiphenyl is virtually the same. The mechanism of the oxidation of hydroxymethylbiphenyls and hydroxymethylbenzenes involves the formation of an unstable cation radical, which is then stabilized by emitting a proton, giving hydroxybenzyl, a more stable radical. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|