X 73)Summary. Temporal chemical oscillations occurring in the BrO&e4+/acetylacetone system have been investigated by three different methods : potentiometry, calorimetry and NMR. spectrometry. In spite of the analogy between acetylacetone and malonic acid, this periodic reaction seems to be rather different from the famous BeEousov-Zhabotinsky reaction.

Summary. New ketonic compounds have been found to generate temporal chemical oscillations in Belousoo-Zhabotimky -type reactions : fluorinated acetylacetone, acetonylacetone (2,5 hexanedione) and, acetone itself.

Oscillating Chemical Reactions (Belousov-Zhabotinskii type) involving cyclic and aliphatic Ketones SummaryFour ketonic compounds (cyclohexanone, cyclopentanone, butanone, and 3-pentanone) have been found to generate chemical oscillations in the Br03-/Ce4+/ ketone system. The effect of changes in concentrations of the reagents has been investigated and differences in behaviour with other systems found. The dependence of these reactions on temperature has been studied and activation energies calculated.

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