JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Action d’imines sur les arylidénemalononitriles: Synthèse de 2-amino-3-cyano-1,4-dihydropyridines

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Reaction of imines 1 with arylidenemalononitriles 2 leads in one step to their corresponding 2-amino-3-cyano-1,4-dihydropyridines 3. The structure of all obtained compounds was confirmed on the basis of their IR, NMR and MS data.

S. Naceur, H. Zantour

imines, enamines, arylidenemalononitriles, 1„4-dihydropyridines

Pages 1163-1170

Heterocyclisation of azacyanine with amines. Synthesis of new fused triazines and pyrimidines rings

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Some novel triazine and pyrimidine derivatives were synthetized by reaction of 1,3- bis (dimethylamino)-1,3-dichloro-2-azapropenylium chloride (azacyanine) with heterocyclic compounds substituted by an amino group.

M. T. Kaddachi, S. Zouari, H. Ben Ammar, J. Cossy, P. Kahn

heterocyclisation, azacyanine, triazine, pyrinndine, amine

Pages 1171-1176

Lignines et triterpènes de Centaurea furfuracea (astéracées)

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Four lignans matairesinol, arctigenin-4'-glucoside, lappaol A and isolappaol A as well as three triterpens β-sitosterol, β-amyrin and taraxasterol have been isolated for the first time from Centaurea furfuracea.

J. A. Fakhfakh, M. Damak

Centaurea furfuracea Coss. et Dur., Asteraceae, lignans, triterpens

Pages 1177-1184

Etude par HPLC et par spectrophotométrie UV de la réaction de décomposition du carbofuran en milieu aqueux

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The present paper reports the investigation of hydrolysis kinetic of 2,2-dimethyl-2,3-dihydrobenzofuran-7-yl- N-methylcabamate in aqueous media. The determination of 2,2-dimethyl-2,3-dihydrobenzofuranol-7-ol by reversed phase liquid chromatography and spectrophotometric UV titrations, as the adduct of hydrolysis carbamate shows the significant reactivity of the insecticide. The obtained positive entropy ΔS = 73,60 3 mol-1 K-1 and the absence of basic general catalysis indicate an E1cB mechanism involving unimolecular collapse of the carbofuran via a methylisocyanate intermediate. This E1cB process is confirmed by the position of the coordinate (pKa = 10,01 ; log kOH = 1,66) corresponding to the carbofuran point on Brönsted line. The β slope value is -1,10. The Brö​​​​​​​nsted relation ship is a plot of the rate bimolecular constant logarithm versus the pKa of the conjugate acid of leaving group for a series of substitued N-methylcarbamate which the decomposition mechanism in aqueous media procede via E1cB.

N. Ben Hamida, L. Latrous, S. Sabbah

carbofuran, kinetic, mechanism, HPLC, spectrophotometric UV

Pages 1185-1197

Synthèse et analyse conformationnelle par modélisation moléculaire des 1,N-bis-[4-phényl-1,] alcanes

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A number of 1,n-bis-(4-phenyl-1,5-benzodiazepin-2-oxo-1-yl(alcanes have been prepared by reaction between 4-phenyl-l,5-benzodiazepin-2-one and dihalogenoalcanes X-(CH2)n-X under phase transfert catalysis conditions. Also, we have study the conformational analysis by molecular modelisation of 1,n-bis-(4-phenyl-1,5-benzodiazepin-2-oxo-1yl-)alcanes.

R. Zniber, A. J El Hajjl, R. Achour, M.Z. Cherkaoui, A. Moussaif, M. El Ghoul, D. Guillon

benzodiazepin, conformational analysis, molecular modelisation, alkan dihalogenure

Pages 1223-1232

Synthèse et réactivité des tosylamidrazones: Obtention des 1,2,4-triazoles tosyles

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The reaction of the iminoesters with the tosylhydrazine in the presence of cations resin exchange gives exclusively the tosylamidrazones with good yields. The latter were converted into tosyltriazoles when submitted to orthoesters in the presence of acetic acid.

M. Kossentini, F. Chabchoub, Y. Le Bigot, M. Salem

tosylamidrazones, tosyltriazoles

Pages 1233-1237

Analyse structurale du système acylant [CCl3CCO2H - (CH3CO)2O] Caractérisation des ions trichloroanhydridium et anhydridium acétiques

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Spectroscopic analysis of the acylant system formed by trichloroacetic acid and acetic anhydride shows the presence of the following species : acetic trichloroanhydridium and acetic anhydridium ions under cyclic chelate shape. The survey of a set of solutions, that variable relative molar fractions, of this acylant system shows that the equilibrium of formation of these ions depends on the initial concentration ratio of the two interactive reagents: [Cl3CCO2H]0 / [(CH3CO)2O]0.

A. Bouchoul, P. Paillous, S. Bouaoud

Acetic anhydride, trichloroacetic acid, mixed anhydride, aryl group

Pages 1245-1251

Electrodeposition of copper indium diselenide from an acidic buffer solution (the glycine media)

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Copper indium diselenide electrodeposition in thin films is studied in an electrolyte consisting of a glycine / glycinium (NH3–CH2–COOH+ / NH2–CH2–COOH) buffer solution. Compared with the currently used sulphuric acid electrolyte, the use of a buffer makes easier the indium insertion, especially when the solution is poorly stirred. This is explained by the fixation of the pH near the electrode that impedes the hydrolysis of In3+ ions.

E. Selmane Bel Hadj Hmida, M. Dachraoui, P. Cowache, J. Vedel

Thin films, electrodeposition, glycine, buffer, CuInSe2 (CIS) current-potential curves, atomic absorption spectroscopy

Pages 1261-1268

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