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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

EYLER, Gladys N.; CANIZO, Adriana I.  and  MATEO, Carmen M.. Solvent effects on the thermal decomposition of trans-3,6-dimethyl-3,6-diphenyl-1,2,4,5-tetraoxacyclohexane in solution. Quím. Nova [online]. 2004, vol.27, n.6, pp.920-924. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422004000600016.

The thermal decomposition reaction of trans-3,6-dimethyl-3,6-diphenyl-1,2,4,5-tetraoxacyclohexane (acetophenone cyclic diperoxide, DPAF), in different solvents (methanol, 1,4-dioxane, acetonitrile and 2-propanol/benzene mixtures) in the initial concentration and temperature ranges of (4.2-10.5) x 10-3 M and 140.0 to 185.0 ºC, respectively, follows a pseudo first order kinetic law up to at least 70% DPAF conversion. An important solvent effect on the rate constant values, activation parameters (DH# and DS#) and reaction products obtained in different solvents is detected, showing that the reaction is accelerated in alcohols.

Keywords : kinetics in solution; solvent effect; acetophenone cyclic diperoxide.

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