JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Ways of access to enamines (Review)

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The enamines constitute the one of the most important classes of reactionnal intermediates and are used often as synthons in some chemical multisteps syntheses. The ways of access to these amino olefines are numerous. We present the different modes of their obtention.

M. Hamadouche, D. El Abed

Pages 337-370

Action of hydrazines on ketoaldehydephosphonates: Synthesis of β-phosphocycloalcanepyrazoles

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A variety of ketoaldehydphosphonates 2 have been prepared by reaction of γ-ketophosphonates 1 with ethylformate in basic conditions. On reaction with hydrazines, compounds 2 lead to β-phosphocycloalcanepyrazoles 3. The structure of all obtained products was determined on the basis of their IR and NMR data.

S. Touil, H. Zantour

Ketones γ-phosphonates, ketoaldehydephosphonates, β-phosphocycloalcanepyrazoles, RMN 1H, RMN 31P, RMN 13C

Pages 371-377

Synthesis of polyfunctionalized derivatives from dibenzo-14-crown-4

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The present work is a contribution to the synthesis of polyfunctionalized dibenzo-14-crown-4. Functions such as bromo, nitro and nitrile were linked to the benzenic cycles. A new series of DB-14C-4 derivatives has been synthesized with mono, di, tri, and tetrasubstitution. Aromatic cycles are bearing one or two different functions. This was leading to the derivatives: Dibromo, tetrabromo, tetranitro, dicyano, tetracyano, dibromodinitro, bromodinitro, and cyanodinitro, dibenzo-14crown-4. The substituted crowns were characterized by 1H-NMR, IR, UV and MS.

A. Ould Hadou, G. Jaouen, F. Meganem

dibenzo-14crown-4, synthesis, functionalization

Pages 379-386

Action of amines and hydrazines derivatives on the N-(3-carbethoxy-2-trienyl) iminoethers: Synthesis of thieno [2-3-d] pyrimidin-4(3H)-ones

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N-(3-carbethoxy-2-thienyl) iminoethers 2, obtained from 2-amino-3-carbethoxythiophenes 1, react with primary amines and hydrazines derivatives to give thieno [2,3-d] pyrimidin-4(3H)-ones 3 and 4. From a mechanistic view point, the reaction proceeds by the intermediary amidines 3' which were isolated.

K. Dridi, M.L. El Efrit, H. Zantour

Pages 387-392

Reaction of enamines with functionalized ethoxylidenes: Synthesis of cycloalcanepyridines

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The condensation of enamines 1 with the ylidenes 2a-b, 2c-e and 2f leads to the formation of dienamines A1, A2 and A3 respectively. Cycloallcanepyridines 3 , 4 and cycloalkanepyridinones 5 were obtained in good yields from the reaction of the intermediates A1, A2 and A3 with ammonia . Their structure is confirmed by IR and NMR spectroscopy.

S. Naceur, H. Zantour

enamines, ethoxylidenes, cycloalkanepyridines, cycloalkanepyridinones

Pages 393-401

Analysis of the essential oil of Tunisian marjoram

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The essential oil obtained by hydrodistillation of marjoram commonly cultivated in Sfax (Tunisia) was analysed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The terpinen-4-ol (32,84%) and the γ-terpinene (9,85%) are the main components of the oil.

N. Ben Hamida-Ben Ezzeddine, M.M. Abdelkefi, M.M. Chaabouni

marjoram, essential oil, GC-MS, terpinen-4-ol, Origanum Majorana L.

Pages 403-408

Determination of mercury in marines sediment with cold vapor in atomic absorption spectrometry technique

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Cold vapor in atomic absorption spectrometry technic allows the determination of mercury at low levels. In sediments, mercury occurs generally in sulfur or in the organic forms, this latter is linked to the micro-organism activities. Thus an appropriate procedure for sample digestion is required. Among the nombrous method of digestion included in the literature we retain the acid mixture procedure [HNO3/HCl (3/1)]. After optimisation of the procedure of analysis, sediment samples collected from different ports in the Gulf of Tunis revealed that concentrations of mercury are in the range of 300-900 ng/g.

N. Mzoughi, A. El Abed, M.S. Medimagh

mercury, marines sediment, Cold vapor, digestion

Pages 409-418

Determination of lithium in natural brines: Interference study

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With regard to very high concentrations of alkaline and alcalino-terreux elements in the naturals brines, it is very difficult to determine Lithium witch is very diluted in the system. Interference phenomena between lithium and Na, K, Ca and Mg are studied and proved by the authors. The limits of the standard additions method when we dose lithium in a natural brine are determined. The aim of this study is to determine the effect of the major elements considered individually and then per couple. The objective is the definition of an area, with regard to Li and interferon concentrations, were the direct determination of lithium is viable. This work is a part of a more detailed study made in order to elaborate a specific method for analysing lithium as a trace in a natural brine.

H. Hamzaoui, A. M’nif, R. Rokbani

naturals brines, lithium, interference phenomena, flame emission spectrometry

Pages 419-429

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