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Thermolysis of α-pinene in supercritical lower alcohols |
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| Authors: | A. M. Chibiryaev V. I. Anikeev A. Yermakova P. E. Mikenin I. V. Kozhevnikov O. I. Sal’nikova |
| Affiliation: | 1. N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, 9 prosp. Akad. Lavrent’eva, 630090, Novosibirsk, Russian Federation 2. Department of Natural Sciences, Novosibirsk State University, 2 ul. Pirogova, 630090, Novosibirsk, Russian Federation 3. G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 5 prosp. Akad. Lavrent’eva, 630090, Novosibirsk, Russian Federation |
| Abstract: | Thermal isomerization of α-pinene in supercritical solvents, viz., ethanol, methanol, and propan-1-ol, was carried out, and differences in the rate and selectivity of the process were revealed. In supercritical ethanol the reaction rate increases sharply and the selectivity remains unchanged with an increase in the temperature (from 290 to 390 °C) or pressure (from 90 to 270 atm). The main reaction products are limonene, isomeric alloocimenes, and pyronenes. The selectivity for limonene in propan-1-ol is higher than in other alcohols when the conversion of α-pinene not higher than 50%. In supercritical ethanol (430 °C, 120 atm, 140 s) limonene is more stable than α-pinene (conversion 8%). |
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