Descomposicion termica del diperoxido de pinacolona (3,6-diterbutil-3,6-dimetil-1,2,4,5-tetraoxaciclohexano) en solución de 2-metoxietanol

Química Nova

Gladys N. Eyler¹  Adriana I. Cañizo¹  Rosa K. Nesprias¹ 

[1] ,Universidad Nacional del Centro de la Provincia de Buenos Aires Facultad de Ingeniería Buenos Aires,Argentina

关键词: cyclic peroxide;    kinetic;    solvent effect;   

DOI  :  10.1590/S0100-40422002000300005

来源: SciELO

【 摘 要 】

The thermal decomposition reaction of pinacolone diperoxide (DPP; 0.02 mol kg-1) in 2-methoxyethanol solution studied in the temperature range of 110.0-150.0 °C, follows a first-order kinetic law up to at least 50% DPP conversion. The organic products observed were pinacolone, methane and tert-butane. A stepwise mechanism of decomposition was proposed where the first step is the homolytic unimolecular rupture of the O-O bond. The activation enthalpy and activation entropy for DPP in 2-methoxyethanol were calculated (deltaH# = 43.8 ± 1.0 kcal mol-1 and deltaS# = 31.9 ± 2.6 cal mol-1K-1) and compared with those obtained in other solvents to evaluate the solvent effect.

【 授权许可】

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