JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Amorphous silica in water treatment analytical aspects and removal processes

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In several industrial applications, the occurence of silica in the used waters is undesirable. Many studies show the complexity and the diversity of the topic. For a better understanding of the problem encountered in water treatment, particularly in water desalination, a synthesis of the different analytical aspects of silica are presented. A diagram summing up the evolution of the different forms of silica (dissolved, polymerized and colloïdal) as well as the terminology associated to its determination is proposed. The different approaches and processes of silica removal, in aqueous electrolyte solutions, are reviewed.

B. Hamrouni, M. Dhahbi

amorphous silica, electrolyte solutions, determination, solubility, silica removal

Pages 461-474

Synthesis, structure determination and photolysis of Δ1-pyrazolines

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1,3-Cycloaddition of 2-diazopropane (DAP) 1 with indenone 2 led to an expected Δ1-pyrazoline 4. The Addition of 1 with 4,6-dimethylbicyclo[3.3.1]nona-3,6-diene-2,8-dione 3 gave a mono-adduct 5 with an "inverse" regiochemical way and an "exo" stereochemistry. The photolysis of 4 and 5 gave an ethylenic derivative 6 and a gem-dimethyl cyclopropane 7 respectively. 

N. Boukamcha, M.T. Martin, A. Khemiss

2-diazopropane, Δ1-pyrazolines, photochemistry, gem-dimethyl cyclopropane

Pages 475-482

Synthesis of new fragrant carbocyclic compounds starting from isophorone

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Reaction of Isophorone 1 with arylaldehydes in alkali media leads to 3-[2-hydroxy-2-aryl]-5,5-dimethylcyclohex-2-enones 2 in good yields. These latters are epoxydized to give epoxycyclohexanone derivatives 4, or dehydrated to give semicyclic dienones 3. Compounds 3 are reduced into their corresponding alcohols 5 when compounds 3 or 5 are submitted to Diels Alder reactions, the tricyclic compounds 6 and 9 are obtained.

Y. El Barkaoui, N. Jorio, S. Fkih-Tetouani, A. El Louzi

Pages 489-502

Isolation of ergosterol peroxide from cyasterone from Ajuga iva leaves hemisynthesis of few structural analogous of cyasterone and study of their antibacterial activities

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Ergosterol peroxide and cyasterone have been isolated from the plant Ajuga iva. Their structural elucidation have been established by spectroscopic methods. We remind that ergosterol peroxide has been identified for the first time in the Ajuga genus. Seven structural analogous have been hemisynthezised from cyasterone, three of them are new. The study of the antibacterial activity of these structural analogous has allowed us to get an idea about sites taking part in this activity.

H. Ben Jannet, A. Chaarl, A. Bakhrouf, M. T. Martin, Z. Mighri

Ajuga iva, Labiatae, steroid, phytoecdysteroid, hemisynthesis, structural analogous, antibacterial activity

Pages 503-515

Preparation of chiral trichloromethyl alcohols in one step and their corresponding ketones

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We have prepared a serie of 18 chiral trichloromethylalcohols in one step by the reaction of trichloroacetic acid with the corresponding aldehyde using nitrobenzene as catalyst in dimethylsulfoxyde at 20°C.We have prepared the new ketones corresponding to the alcohols listed above using barium manganate as oxidant in dichloromethane.

I. Cheraief, T. Homri, B. Ben Hassine

trichloromethyl alcohols, ​​​​​​ trichloromethyl ketones, ​​​​​​ trichloroacetic acid, nitrobenzene

Pages 517-528

Reaction of aminoazoles with γ-keto-δ-formylphosphonates: Synthesis of β-phosphocycloalcaneazolopyrimidines and pyridazines

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The reaction of aminoazoles with γ-keto-δ-formylphosphonates 1 leads to (β-phosphocycloalcaneazolopyrimidines and pyridazines 2, 3, 4, 5 and 5'. The structure of all obtained products was determined on the basis of their IR and NMR data.

S. Touil, H. Zantour

γ-keto-δ-formylphosphonates, β-phosphocycloalcaneazolopyrimidines, β-phosphocycloalcaneazolopyridazines, RMN 1H, RMN 31P, RMN 13C

Pages 529-535

Reaction of functionalized ethoxyalkylidenes with 2-aminopyridine synthesis of 4-oxopyrido [1, 2-a] pyrimidines and 4-iminopyrido [1, 2-a] pyrimidines

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The reaction of some ethoxyalkylidenes with 2-aminopyridine have been studied. We have shown that this reaction lead to 4-oxopyrido [1, 2-a] pyrimidines or 4-iminopyrido [1, 2-a] pyrimidines. The reactionnel intermediary have been isolated in some cases.

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

2-aminopyridine, ethoxyalkylidenes, 4-oxopyrido [1, 2-a] pyrimidines, 4-iminopyrido [1, 2-a] pyrimidines

Pages 537-546

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