JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Synthesis of 17α-acetoxy-6,21-dimethyl3, 20-dioxo-19 norpregna-4,6-diene

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A search for increasing progestin activity has led to the synthesis of the 17α-acetoxy-6,21-dimethy1-3,20-dioxo-19- norpregna-4,6-diene. This new compound has been obtained from the 19-norandrostenedione which was subjected to, a Wittig reaction with Ph3P=CHEt, followed by oxidation of Δ-17(20) to 17α-OH and 20-oxo by OsO4 and triethylamine N-oxide hydrogen peroxide, and finally elaboration in to the 6-methyl-4,6-diene-3-one according to know methodologies.

M.N. Nasraoui, A. Piasco, C. Tchernatinsky

Pages 427-434

Synthesis of stable pyrazolenins having a ketone function

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The 1,3-dipolar cycloaddition of diazo-2 propane (DAP) with diactivated dissymetric acetylenes has enabled us to synthesise in good yield homologous 3H-Pyrazoles with an acetyl group as substituent on C4 or C5. The synthesis of the starting acetylenes was carried out satisfactorily.

A. Khemiss

Pages 435-443

Specific reactivity of 3-chloro-2-phenyl 3-trifluoromethylacrolein

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3-chloro-2-phenyl-3-trifluoromethylacrolein reactivity towards various nucleophiles has been studied. Depending on solvent and reagent several mecanisms are involved: 1,2 addition followed or not by reduction or elimination and β-substitution followed or not by 1,4 addition.

A. Selmi, M.M. El Gaied, G. Alvernhe

Pages 445-454

Influence of magnesium ions on crystal growth of calcium sulfate dihydrate

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The kinetics of crystallization of calcium sulfate dihydrate has been studied at 30°C, in magnesium poisoned solutions by constant composition method. The inhibitory effect of the magnesium ions on the rate of crystallization has been attributed to their adsorption at particular sites.

S. Ghorbel, H.F. Ayedi, J.-C. Heughebaert

Pages 455-464

Influence of the liquid pulsation on the performance of an electrochemical reactor

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The behaviour of the Porous Percolated Pulsated Electrode (3PE) being similar, either to that of a plag-flow reactor or to that of a perfectly-stirred reactor. Expressions of intensity through the cell and of voltage drop are established for both working modes. We show that operating a 3PE reactor allows the use of a granular matrix up to twice as high as that of a fixed-bed reactor.

A. Gadri, A. Ratel, G. Lacoste

Pages 465-479

Free aminoacids in vegetal species from Center-south of Cameroon

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The presence of essential amino-acids in the leaves of vegetables is an important factor when appreciating the quality of these vegetables. The study of free amino-acids in vegetal species with edible leaves appears then to be important in the choice of a vegetable. This is the purpose of this article which is about the quantitative analysis of free amino-acids in leaves of twelve edible plants.

D. Tombet

Pages 481-485

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