Kinetical studies of acid-catalysed hydrolysis of orthoester have been performed. in DOS reverse micelles. The results show a two steps process (a rapid process followed by a low one). The phenomenon is attributed to changes in reaction mechanism.
A. Boyer, G. Lamaty, T. Makhlouf, J.P. Roque
Pages 3-6
AC13 — C17 section of linear and saturated hydrocarbons has been submitted to a gentle gas phase oxidation reaction. The resulting products have been separated and identified. They are practically the same that those issued from oxidation of pure n-tetradecane.
M.M. Abdelkafi, A. Baklouti
Pages 7-12
By the action of trimethylamine dihydrofluoride (Me3N, 2HF), various 2,3-epoxycyclohexanones can be converted in good yields into a mixture of aromatized compounds, 2-hydroxy and 2-fluoro-2 cyclohexanones.
M.M. El Gaied, H. Amri
Pages 13-15
Methyl radical issued from electrochemical oxidation reactivity of acetate ions in isobutyronitrile allow hydrogen removal reactions from the later. Nevertheless the yields in condensed products are low because of preferable evolution of CH3 radicals according to Holbe dimerization reaction.
M. Ben Abderrahman, E. Laurent
Pages 17-21
The photolysis of a C5-ketonic pyrazolenine has enabled us to demonstrate the intermediary of a ketovinylcarbene. This intermediate constitutes a step in competition between stabilization of the carbene and a Wolff rearrangement. Similarly, we have shown that cyclopropenes having a ketonic function on the double bond can be obtained by photolysis of pyrazolenines having an acetyl substituent on C5 position.
A. Khemiss
Pages 23-29
This work deals with a theoretical and experimental investigation of absorption kinetics of water vapor on activated alumina. Experimental results are interpreted with an isothermal diffusion model. A comparison between theory and experiments allows a determination of the effective diffusion "De" in the pose system.
M. Baguenne, A. Bellagi
Pages 31-38
This is about a simple tutorials manipulation which involves a few equipment and pro¬ducts. It shows the porosity of ions exchange resins and allows to calculate interstitial volumes and real and apparent specific gravities for dry or hydrated resin.
C. Catusse, R. Catusse
Pages 39-41