Catalytic decomposition of 3,3,6,6-tetramethyl-1,2,4,5-tetroxane. Effect of ferric ions (Fe3+)

M.B. REGUERA; J.M. ROMERO; S. BUSTILLO; N.L. JORGE; M.E. GÓMEZ-VARA; E.A. CASTRO

Krag. J. Sci.

Año: 2007

ABSTRACT Thermal decomposition of 3,3,6,6-tetramethy l-1,2,4,5-tetroxane in presence of iron (III) salts takes place through a coordination mechanism, involving the metal ion as a Lewis acid, and it’s completely consistent with the counter ion effect observed. The activation parameters of the reaction initial step (DH# = 10,96±0.8 kcal/mol ; DS# = -34,4±0.6 kcal/mol; DG # = 25,48±0.8 kcal/mol) are compared with those reported for the unimolecular thermolyses of the 3,3,6,6-tetramethyl-1,2,4,5-tetroxane in presence of other metallic ions.   KEY WORDS: Tetroxane- Ferric Ions-Catalytic-Decomposition