Safia Djebbar

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Reactivity of benzofuran and benzothiophene in palladium-catalysed direct C2,C3-diarylations

Karima Si Larbi, Safia Djebbar, Jean-François Soulé, Henri Doucet

Journal of Organometallic Chemistry > 2017 > 843 > Complete > 32-39

The Pd-catalysed one pot direct diarylation of benzofuran and benzothiophene at both C2- and C3-positions was studied. In the presence of electron-deficient aryl bromides, the diarylation of benzofuran proceeded in good yields; whereas, with benzothiophene moderate yields were generally obtained, as the C3-position exhibits a poor reactivity. In order to obtain 2,3-diarylated benzothiophenes, its...

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Reactivity of N-protected 5-(2-bromophenyl)tetrazoles in palladium-catalyzed direct arylation of heteroarenes or fluorobenzenes

Sabah Chikhi, Safia Djebbar, Jean-François Soulé, Henri Doucet

Journal of Organometallic Chemistry > 2017 > 831 > C > 55-63

A new route allowing the one-step synthesis of (2-heteroarylphenyl)tetrazole and fluorinated biphenyltetrazole derivatives is disclosed. By using 2 mol% of an air-stable diphosphine-palladium catalyst [PdCl(C₃H₅)(dppb)], potassium pivalate as base and dimethylacetamide as solvent, a wide range of heteroarenes (e.g., thiazoles, (benzo)thiophenes, furans, pyrroles, and imidazo[1,2-a]pyridine) and polyfluorobenzenes...

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Structure, vibrational analysis, electronic properties and chemical reactivity of two benzoxazole derivatives: Functional density theory study

Sihem Zaater, Afaf Bouchoucha, Safia Djebbar, Meziane Brahimi

Journal of Molecular Structure > 2016 > 1123 > C > 344-354

In the present work we calculate structural parameters, vibrational spectra (IR, ¹H NMR and UV–Visible Absorption) and corresponding mode of vibrational assignments of two ligands derived from benzoxazole; L¹: 2-(5-(trifluoromethylpyridin-2-yl)-benzoxazole and L²: 2-(5-methylpyridin-2-yl)-benzoxazole at B3LYP/6-311++G** level, in the gas phase. The HOMO and LUMO study is used to determine the charge...

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Synthesis of symmetrical and unsymmetrical 1,3-diheteroarylbenzenes through palladium-catalyzed direct arylation of benzene-1,3-disulfonyl dichloride and 3-bromobenzenesulfonyl chlorides

Imane Idris, Fazia Derridj, Safia Djebbar, Jean-François Soulé, more

Tetrahedron > 2015 > 71 > 52 > 9617-9625

The palladium-catalyzed synthesis of unsymmetrical 1,3-diheteroarylbenzenes was investigated. The first synthetic pathway relies on the desymmetrization of benzene-1,3-disulfonyl dichloride through two successive palladium-catalyzed direct desulfitative arylations with two different heteroarenes. The second strategy employs the orthogonal functionalization of 3-bromobenzenesulfonylchloride using an...

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sp3–sp3 carbon–carbon bond formation using 2-alkylazoles and a bromoacrylate as the reaction partners

Liqin Zhao, Fazia Derridj, Safia Djebbar, Christian Bruneau, more

Tetrahedron Letters > 2015 > 56 > 29 > 4354-4358

A carbonate base was found to promote the formation of sp ³ –sp ³ carbon–carbon bonds of 2-alkylazoles with a bromoacrylate. The reaction tolerates various alkyl substituents and a variety of heteroarenes such as thiazoles, oxazoles or imidazoles.

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A new ternary ruthenium(III) complex with 1,3-bis(salicylideneamino) propan-2-ol and 3-picolylamine: Synthesis, characterization, density functional theory and preparation of electrochemical sensor for nitrite analysis

Achour Terbouche, Chafia Ait-Ramdane-Terbouche, Safia Djebbar, Djamila Guerniche, more

Journal of Molecular Structure > 2014 > 1076 > Complete > 501-511

A novel electrochemical sensor based on graphite (G) functionalised with a new ternary ruthenium(III) complex was developed and applied to detect nitrite in aqueous solution. The Ru(III) complex was synthesized using 1,3-bis(salicylideneamino) propan-2-ol polydentate Schiff base (BSAP) and 3-Picolylamine (PLA), and was characterized by elemental analysis, Fourier transform infrared spectroscopy (FT-IR),...

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Synthesis, characterization, electrochemical studies and DFT calculations of amino acids ternary complexes of copper (II) with isonitrosoacetophenone. Biological activities

Nabila Tidjani-Rahmouni, Nour el Houda Bensiradj, Safia Djebbar, Ouassini Benali-Baitich

Journal of Molecular Structure > 2014 > 1075 > Complete > 254-263

Three mixed complexes having formula [Cu(INAP)L(H ₂ O) ₂ ] where INAP=deprotonated isonitrosoacetophenone and L=deprotonated amino acid such as histidine, phenylalanine and tryptophan have been synthesized. They have also been characterized using elemental analyses, molar conductance, UV–Vis, IR and ESR spectra. The value of molar conductance indicates them to be non-electrolytes....

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New complexes of manganese (II), nickel (II) and copper (II) with derived benzoxazole ligands: Synthesis, characterization, DFT, antimicrobial activity, acute and subacute toxicity

Afaf Bouchoucha, Achour Terbouche, Assia Bourouina, Safia Djebbar

Inorganica Chimica Acta > 2014 > 418 > Complete > 187-197

A series of new manganese (II), nickel (II) and copper (II) complexes with two ligands derived from benzoxazole have been prepared and characterized by elemental analysis, emission atomic spectroscopy, TGA measurements, ESR, magnetic measurements, FTIR, UV–Vis spectra and conductivity. The experimental results and the calculated molecular parameters (DFT) revealed a distorted octahedral geometry for...

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Electrochemical sensors using modified electrodes based on copper complexes formed with Algerian humic acid modified with ethylenediamine or triethylenetetramine for determination of nitrite in water

Chafia Ait Ramdane-Terbouche, Achour Terbouche, Safia Djebbar, Didier Hauchard

Talanta > 2014 > 119 > Complete > 214-225

The response and efficiency of new sensors for nitrite ions analysis have been studied electrochemically. These sensors were developed by modifying a carbon paste electrode (CPE) with copper (II) complexes formed with commercial (PFHA) and Algerian (YHA) humic acids and their modified compounds with ethylenediamine (EDA) or triethylenetetramine (TETA). The developed mechanism is based on the electrochemical...

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Iron and nickel complexes with heterocyclic ligands: Stability, synthesis, spectral characterization, antimicrobial activity, acute and subacute toxicity

Afaf Bouchoucha, Achour Terbouche, Mohamed Zaouani, Fazia Derridj, more

Journal of Trace Elements in Medicine and Biology > 2013 > 27 > 3 > 191-202

The synthesis and characterization by elemental analysis, emission atomic spectroscopy, TG measurements, magnetic measurements, FTIR, ¹ H NMR, UV–visible spectra and conductivity of a series of iron (II) and nickel (II) complexes with two heterocyclic ligands (L ¹ (SMX): sulfamethoxazole and L ² (MIZ): metronidazole) used in pharmaceutical field and with a new ligand derived...

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Palladium-catalyzed direct arylation using free NH2 substituted thiophene derivatives with inhibition of amination type reaction

Fazia Derridj, Karima Si Larbi, Julien Roger, Safia Djebbar, more

Tetrahedron > 2012 > 68 > 36 > 7463-7471

The palladium-catalyzed direct arylation at C2 or C5 of free NH ₂ substituted thiophene derivatives was found to proceed in moderate to high yields using a variety of aryl halides. The choice of potassium acetate as the base was found to be crucial to inhibit the amination reaction and to promote the direct arylation.

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Palladium‐Catalysed Direct Monoarylation of Bithiophenyl Derivatives or Bis(thiophen‐2‐yl)methanone with Aryl Bromides

Karima Si Larbi, Safia Djebbar, Henri Doucet

European Journal of Inorganic Chemistry > 2011 > 23 > 3493 - 3502

Arylated bithiophenes, which are useful compounds due to their coordination and/or physical properties, can be easily prepared by palladium‐catalysed C–H bond activation of heteroaromatics followed by arylation using electron‐deficient aryl bromides. A variety of 5‐arylated 2,2′‐bithiophenyl derivatives have been prepared. Good yields were generally obtained by using the air‐stable [PdCl(dppb)(C₃H...

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Evaluation of adsorption capacities of humic acids extracted from Algerian soil on polyaniline for application to remove pollutants such as Cd(II), Zn(II) and Ni(II) and characterization with cavity microelectrode

Achour Terbouche, Chafia Ait Ramdane-Terbouche, Didier Hauchard, Safia Djebbar

Journal of Environmental Sciences > 2011 > 23 > 7 > 1095-1103

The adsorption capacities of new humic acids isolated from Yakouren forest (YHA) and Sahara (Tamenrasset: THA) soils (Algeria) and commercial humic acid (PFHA) on polyaniline emeraldine base (PEB) were studied at pH 6.6. Also the adsorption of heavy metals such as Cd ²⁺ , Zn ²⁺ and Ni ²⁺ on humic acid-polyaniline systems (HA-PEB) was investigated at the same conditions. HA-PEB...

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Complexation Study of Humic Acids Extracted from Forest and Sahara Soils with Zinc (II) and Cadmium (II) by Differential Pulse Anodic Stripping Voltammetry (DPASV) and Conductimetric Methods

Achour Terbouche, Safia Djebbar, Ouassini Benali-Baitich, Didier Hauchard

Water, Air, & Soil Pollution > 2011 > 216 > 1-4 > 679-691

The complexation of heavy metals, present in their dissolved state at relevant trace levels, with new humic acids (HAs) isolated from Yakouren forest (YHA) and Sahara (Tamenrasset: THA) soils has been studied by differential pulse anodic stripping voltammetry (DPASV) at a hanging mercury drop electrode and conductimetry methods. After extraction and purification, humic acids were characterized by...

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Palladium-Catalyzed Direct Arylation of Free NH ₂ -Substituted Thiophene Derivatives

Fazia Derridj, Julien Roger, Safia Djebbar, Henri Doucet

Organic Letters > 2010 > 12 > 19 > 4320 - 4323

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Palladium-catalyzed direct heteroarylation of chloropyridines and chloroquinolines

Fazia Derridj, Julien Roger, Florence Geneste, Safia Djebbar, more

Journal of Organometallic Chemistry > 2009 > 694 > 3 > 455-465

The direct coupling of aryl chlorides with heteroarenes would be a considerable advantage for sustainable development due to their lower cost, lower mass, the wider diversity of available compounds and also because of the formation of only HCl associated to a base as by-product and the reduction of the number of steps to prepare these compounds. We observed that through the use of PdCl(dppb)(C ...

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Alkenyl bromides: useful coupling partners for the palladium-catalysed coupling with heteroaromatics via a C–H bond activation

Aditya L. Gottumukkala, Fazia Derridj, Safia Djebbar, Henri Doucet

Tetrahedron Letters > 2008 > 49 > 18 > 2926-2930

Alkenyl bromides were found to be useful reactants for the palladium-catalysed direct C–H activation/functionalisation reaction of heteroaromatics such as benzoxazole or benzothiazole. Moderate to good yields of coupling products were obtained using both α- and β-substituted alkenyl bromides or even the trisubstituted alkenyl bromide 2-bromo-3-methylbut-2-ene. This reaction is environmentally attractive...

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Direct arylation of oxazole and benzoxazole with aryl or heteroaryl halides using a palladium–diphosphine catalyst

Fazia Derridj, Safia Djebbar, Ouassini Benali-Baitich, Henri Doucet

Journal of Organometallic Chemistry > 2008 > 693 > 1 > 135-144

Through the use of PdCl(dppb)(C ₃ H ₅ ) as a catalyst, a range of aryl bromides and chlorides undergoes coupling via C–H bond activation/functionalization reaction with oxazole or benzoxazole in good yields. This air-stable catalyst can be used at low loadings with several substrates. Surprisingly, better results in terms of substrate/catalyst ratio were obtained in several cases using...

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Synthesis, characterisation and antifungal activity of a series of Cobalt(II) and Nickel(II) complexes with ligands derived from reduced N, N′-o-Phenylenebis(Salicylideneimine)

Sabrina Belaïd, Anne Landreau, Safia Djebbar, Ouassini Benali-Baïtich, more

Transition Metal Chemistry > 2008 > 33 > 4 > 511-516

The synthesis and characterisation by elemental analysis, conductivity, FTIR, UV–Visible, ESR and magnetic measurements are described for a series of complexes of nickel(II) and cobalt(II) with three ligands (H₂L^1–3) derived from reduced N, N′-o-Phenylenebis(salicylideneimine). The complexes formed are identified as neutral species, where the ligands are coordinated through N and O donor atoms. The...

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Synthesis, characterization and antifungal activity of a series of manganese(II) and copper(II) complexes with ligands derived from reduced N,N′-O-phenylenebis(salicylideneimine)

Sabrina Belaid, Anne Landreau, Safia Djebbar, Ouassini Benali-Baitich, more

Journal of Inorganic Biochemistry > 2008 > 102 > 1 > 63-69

A series of manganese(II) and copper(II) complexes with reduced Schiff bases derived from o-phenylenediamine has been prepared and characterized by elemental analysis, TG measurements, ESR, magnetic measurements, FTIR, UV–Visible spectra and conductivity. These complexes were found to be [MnL(H ₂ O) _n ] and [CuL](H ₂ O) _n species with n=0–2. Their antifungal activity...

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Search results for: Safia Djebbar

Reactivity of benzofuran and benzothiophene in palladium-catalysed direct C2,C3-diarylations

Reactivity of N-protected 5-(2-bromophenyl)tetrazoles in palladium-catalyzed direct arylation of heteroarenes or fluorobenzenes

Structure, vibrational analysis, electronic properties and chemical reactivity of two benzoxazole derivatives: Functional density theory study

Synthesis of symmetrical and unsymmetrical 1,3-diheteroarylbenzenes through palladium-catalyzed direct arylation of benzene-1,3-disulfonyl dichloride and 3-bromobenzenesulfonyl chlorides

sp3–sp3 carbon–carbon bond formation using 2-alkylazoles and a bromoacrylate as the reaction partners

A new ternary ruthenium(III) complex with 1,3-bis(salicylideneamino) propan-2-ol and 3-picolylamine: Synthesis, characterization, density functional theory and preparation of electrochemical sensor for nitrite analysis

Synthesis, characterization, electrochemical studies and DFT calculations of amino acids ternary complexes of copper (II) with isonitrosoacetophenone. Biological activities

New complexes of manganese (II), nickel (II) and copper (II) with derived benzoxazole ligands: Synthesis, characterization, DFT, antimicrobial activity, acute and subacute toxicity

Electrochemical sensors using modified electrodes based on copper complexes formed with Algerian humic acid modified with ethylenediamine or triethylenetetramine for determination of nitrite in water

Iron and nickel complexes with heterocyclic ligands: Stability, synthesis, spectral characterization, antimicrobial activity, acute and subacute toxicity

Palladium-catalyzed direct arylation using free NH2 substituted thiophene derivatives with inhibition of amination type reaction

Palladium‐Catalysed Direct Monoarylation of Bithiophenyl Derivatives or Bis(thiophen‐2‐yl)methanone with Aryl Bromides

Evaluation of adsorption capacities of humic acids extracted from Algerian soil on polyaniline for application to remove pollutants such as Cd(II), Zn(II) and Ni(II) and characterization with cavity microelectrode

Complexation Study of Humic Acids Extracted from Forest and Sahara Soils with Zinc (II) and Cadmium (II) by Differential Pulse Anodic Stripping Voltammetry (DPASV) and Conductimetric Methods

Palladium-Catalyzed Direct Arylation of Free NH ₂ -Substituted Thiophene Derivatives

Palladium-catalyzed direct heteroarylation of chloropyridines and chloroquinolines

Alkenyl bromides: useful coupling partners for the palladium-catalysed coupling with heteroaromatics via a C–H bond activation

Direct arylation of oxazole and benzoxazole with aryl or heteroaryl halides using a palladium–diphosphine catalyst

Synthesis, characterisation and antifungal activity of a series of Cobalt(II) and Nickel(II) complexes with ligands derived from reduced N, N′-o-Phenylenebis(Salicylideneimine)

Synthesis, characterization and antifungal activity of a series of manganese(II) and copper(II) complexes with ligands derived from reduced N,N′-O-phenylenebis(salicylideneimine)

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