Effect of ionic liquid on the thermal decomposition of cyclic organic peroxides
The thermolysis of cyclic diethylketone triperoxide (3,3,6,6,9,9-hexaethyl-1,2,4,5,7,8-hexaoxacyclononane, DEKTP) and cyclic pinacolone diperoxide (3,6-diterbutyl-3,6-dimethyl-1,2,4,5-tetraoxacyclohexane, PDP) was studied in neat N,N-dimethylformamide (DMF) and in binary mixtures DMF/Ionic Liquid (1...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/58802 |
| Acceso en línea: | http://hdl.handle.net/11336/58802 |
| Access Level: | acceso abierto |
| Palabra clave: | CYCLIC ORGANIC PEROXIDES IONIC LIQUID ISOTHERMAL KINETICS SOLVENT EFFECT THERMAL DECOMPOSITION THERMOLYSIS https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | The thermolysis of cyclic diethylketone triperoxide (3,3,6,6,9,9-hexaethyl-1,2,4,5,7,8-hexaoxacyclononane, DEKTP) and cyclic pinacolone diperoxide (3,6-diterbutyl-3,6-dimethyl-1,2,4,5-tetraoxacyclohexane, PDP) was studied in neat N,N-dimethylformamide (DMF) and in binary mixtures DMF/Ionic Liquid (1-butyl-3-methylimidazolium tetrafluoroborate, [BMIM+][BF4 -]). The activation parameters for the decomposition of both peroxides in DMF, correspond to a process of homolytic cleavage of one OO bond, generating a biradical in the initial step of radical mechanism. The rate constant values (kd ) are higher for reactions performed in mixtures. A gradual increase of [BMIM+][BF4 -] in the reaction media generates higher kd for both peroxides (i.e. kd , DEKTP in DMF/[BMIM+][BF4 -] 4.0molL-1 is 3.3 times greater than the kd obtained for the mixture with a concentration 1.0molL-1, under the same experimental conditions). The increase in decomposition rate can be associated with a more solvated and stabilized transition state when the ionic liquid is part of the reaction medium. |
|---|