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Aicha Derdour - One of the best experts on this subject based on the ideXlab platform.
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Benzene Ring containing cationic gemini surfactants synthesis surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Nadjia Benhamed, Yves Grohens, Mustapha Mohamedbenkada, Salima Saidibesbes, Aicha DerdourAbstract:Abstract New quaternary ammonium gemini surfactants of the general formula C n H 2n + 1 -Ph-NHCOCH 2 N + (CH 3 ) 2 -(CH 2 ) s -N + (CH 3 ) 2 CH 2 CONH-Ph-C n H 2n + 1 (with n = 8, 10, 12, 14, 16 and s = 2, 4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N , N , N ′, N ′-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21–0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water–air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus , Escherichia coli and Candida albicans .
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Benzene Ring containing cationic gemini surfactants: Synthesis, surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Mustapha Mohamed-benkada, Nadjia Benhamed, Salima Saidi-besbes, Yves Grohens, Aicha DerdourAbstract:New quaternary ammonium gemini surfactants of the general formula CnH2n+1-Ph-NHCOCH2N+(CH3)(2)-(CH2)(s)- N+(CH3)(2)CH2CONH-Ph-CnH2n+1 (with n = 8, 10,12, 14,16 and s = 2,4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N,N,N',N'-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21-0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water-air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus, Escherichia coli and Candida albicans. (C) 2017 Elsevier B.V. All rights reserved.
Khadidja Taleb - One of the best experts on this subject based on the ideXlab platform.
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Benzene Ring containing cationic gemini surfactants synthesis surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Nadjia Benhamed, Yves Grohens, Mustapha Mohamedbenkada, Salima Saidibesbes, Aicha DerdourAbstract:Abstract New quaternary ammonium gemini surfactants of the general formula C n H 2n + 1 -Ph-NHCOCH 2 N + (CH 3 ) 2 -(CH 2 ) s -N + (CH 3 ) 2 CH 2 CONH-Ph-C n H 2n + 1 (with n = 8, 10, 12, 14, 16 and s = 2, 4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N , N , N ′, N ′-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21–0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water–air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus , Escherichia coli and Candida albicans .
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Benzene Ring containing cationic gemini surfactants: Synthesis, surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Mustapha Mohamed-benkada, Nadjia Benhamed, Salima Saidi-besbes, Yves Grohens, Aicha DerdourAbstract:New quaternary ammonium gemini surfactants of the general formula CnH2n+1-Ph-NHCOCH2N+(CH3)(2)-(CH2)(s)- N+(CH3)(2)CH2CONH-Ph-CnH2n+1 (with n = 8, 10,12, 14,16 and s = 2,4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N,N,N',N'-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21-0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water-air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus, Escherichia coli and Candida albicans. (C) 2017 Elsevier B.V. All rights reserved.
Yves Grohens - One of the best experts on this subject based on the ideXlab platform.
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Benzene Ring containing cationic gemini surfactants synthesis surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Nadjia Benhamed, Yves Grohens, Mustapha Mohamedbenkada, Salima Saidibesbes, Aicha DerdourAbstract:Abstract New quaternary ammonium gemini surfactants of the general formula C n H 2n + 1 -Ph-NHCOCH 2 N + (CH 3 ) 2 -(CH 2 ) s -N + (CH 3 ) 2 CH 2 CONH-Ph-C n H 2n + 1 (with n = 8, 10, 12, 14, 16 and s = 2, 4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N , N , N ′, N ′-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21–0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water–air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus , Escherichia coli and Candida albicans .
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Benzene Ring containing cationic gemini surfactants: Synthesis, surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Mustapha Mohamed-benkada, Nadjia Benhamed, Salima Saidi-besbes, Yves Grohens, Aicha DerdourAbstract:New quaternary ammonium gemini surfactants of the general formula CnH2n+1-Ph-NHCOCH2N+(CH3)(2)-(CH2)(s)- N+(CH3)(2)CH2CONH-Ph-CnH2n+1 (with n = 8, 10,12, 14,16 and s = 2,4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N,N,N',N'-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21-0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water-air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus, Escherichia coli and Candida albicans. (C) 2017 Elsevier B.V. All rights reserved.
Nadjia Benhamed - One of the best experts on this subject based on the ideXlab platform.
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Benzene Ring containing cationic gemini surfactants synthesis surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Nadjia Benhamed, Yves Grohens, Mustapha Mohamedbenkada, Salima Saidibesbes, Aicha DerdourAbstract:Abstract New quaternary ammonium gemini surfactants of the general formula C n H 2n + 1 -Ph-NHCOCH 2 N + (CH 3 ) 2 -(CH 2 ) s -N + (CH 3 ) 2 CH 2 CONH-Ph-C n H 2n + 1 (with n = 8, 10, 12, 14, 16 and s = 2, 4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N , N , N ′, N ′-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21–0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water–air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus , Escherichia coli and Candida albicans .
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Benzene Ring containing cationic gemini surfactants: Synthesis, surface properties and antibacterial activity
Journal of Molecular Liquids, 2017Co-Authors: Khadidja Taleb, Mustapha Mohamed-benkada, Nadjia Benhamed, Salima Saidi-besbes, Yves Grohens, Aicha DerdourAbstract:New quaternary ammonium gemini surfactants of the general formula CnH2n+1-Ph-NHCOCH2N+(CH3)(2)-(CH2)(s)- N+(CH3)(2)CH2CONH-Ph-CnH2n+1 (with n = 8, 10,12, 14,16 and s = 2,4, 6) have been synthesized by an efficient synthetic pathway based on the quaternization of N,N,N',N'-tetramethylalkylenediamine with 2-bromo-N-(4-(alkyloxy) phenyl) acetamides. Their surface properties were investigated by surface tension, electrical conductivity and dynamic light scatteRing (DLS) measurements. The study shows that the incorporation of a Benzene Ring in the hydrophobic tail prompts micelle formation which leads to a smaller cmc values in the range of 0.21-0.009 mM compared to analogous geminis beaRing alkyl hydrophobic chains. The length of the spacer and the hydrophobic chain has a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water-air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scatteRing technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus aureus, Escherichia coli and Candida albicans. (C) 2017 Elsevier B.V. All rights reserved.
Naoto Chatani - One of the best experts on this subject based on the ideXlab platform.
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Ruthenium- and rhodium-catalyzed direct carbonylation of the ortho C-H bond in the Benzene Ring of N-arylpyrazoles.
The Journal of organic chemistry, 2004Co-Authors: Taku Asaumi, Takuya Matsuo, Takahide Fukuyama, Fumitoshi Kakiuchi, Naoto ChataniAbstract:The direct carbonylation of C-H bonds in the Benzene Ring of N-phenylpyrazoles via catalysis by ruthenium or rhodium complexes is described. The reaction of N-phenylpyrazoles with carbon monoxide and ethylene in the presence of Ru(3)(CO)(12) or Rh(4)(CO)(12) resulted in the site-selective carbonylation of the ortho C-H bonds in the Benzene Ring to give the corresponding ethyl ketones. A variety of functional groups on the Benzene Ring can be tolerated. N-Phenylpyrazoles have higher reactivities than would be expected, based on the pK(a) values of the conjugate acid of pyrazole. The choice of solvent for this reaction is significant, and N, N-dimethylacetamide (DMA) gives the best result.
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Direct carbonylation at a C-H bond in the Benzene Ring of 2- phenyloxazolines catalyzed by Ru3(CO)12. Scope, limitations, and mechanistic aspects
The Journal of organic chemistry, 2000Co-Authors: Naoto Chatani, Takahide Fukuyama, Fumitoshi Kakiuchi, Takashi Ogo, Daniel Richard Marshall, Shinji MuraiAbstract:The ruthenium-catalyzed carbonylation at a C−H bond in the Benzene Ring of a 2-phenyloxazoline is described. The reaction of 2-phenyloxazolines with CO and ethylene in toluene in the presence of a catalytic amount of Ru3(CO)12 resulted in propionylation at an ortho C−H bond in the Benzene Ring. The presence of the oxazoline Ring on the Benzene Ring is essential for the carbonylation to proceed. Other heterocycles, such as oxazine, oxazole, and thiazoline Rings, also served as acceptable directing groups as did the oxazoline Ring. A wide functional group compatibility was observed. The site selectivity of the carbonylation was examined using meta-substituted phenyloxazolines. It was found that the carbonylation took place exclusively at the less-hindered C−H bond, irrespective of the nature of substituents, indicating that the site selectivity was determined by steric factors. The reaction was also applicable, not only to a Benzene Ring, but also to naphthyl and thiophenyl Rings. Olefins such as propene an...
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ru3 co 12 catalyzed reaction of pyridylBenzenes with carbon monoxide and olefins carbonylation at a c h bond in the Benzene Ring
Journal of Organic Chemistry, 1997Co-Authors: Naoto Chatani, Fumitoshi Kakiuchi, Shinji MuraiAbstract:A ruthenium-catalyzed carbonylation at a C−H bond in a Benzene Ring is described. The reaction of pyridylBenzenes with CO (20 atm) and ethylene in toluene at 160 °C in the presence of a catalytic amount of Ru3(CO)12 results in propionylation at an ortho C−H bond in the Benzene Ring. Carbonylation does not occur at the pyridine Ring, although this is necessary as a directing group to promote the reaction. Olefins such as trimethylvinylsilane and tert-butylethylene in place of ethylene can also be used in this reaction, however 1-hexene, cyclohexene, allyltrimethylsilane, styrene, methyl methacrylate, vinyl acetate, triethoxyvinylsilane, and isopropenyltrimethylsilane do not afford the coupling products. Transition metal complexes, other than ruthenium carbonyl, examined thus far, do not show catalytic activity. In the reaction of meta-substituted pyridylBenzenes, such as those having Me, OMe, CF3, and COOMe group at the meta position in the Benzene Ring, carbonylation takes place at the less hindered C−H b...
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Ru3(CO)12-Catalyzed Reaction of PyridylBenzenes with Carbon Monoxide and Olefins. Carbonylation at a C−H Bond in the Benzene Ring
The Journal of organic chemistry, 1997Co-Authors: Naoto Chatani, Fumitoshi Kakiuchi, Shinji MuraiAbstract:A ruthenium-catalyzed carbonylation at a C−H bond in a Benzene Ring is described. The reaction of pyridylBenzenes with CO (20 atm) and ethylene in toluene at 160 °C in the presence of a catalytic amount of Ru3(CO)12 results in propionylation at an ortho C−H bond in the Benzene Ring. Carbonylation does not occur at the pyridine Ring, although this is necessary as a directing group to promote the reaction. Olefins such as trimethylvinylsilane and tert-butylethylene in place of ethylene can also be used in this reaction, however 1-hexene, cyclohexene, allyltrimethylsilane, styrene, methyl methacrylate, vinyl acetate, triethoxyvinylsilane, and isopropenyltrimethylsilane do not afford the coupling products. Transition metal complexes, other than ruthenium carbonyl, examined thus far, do not show catalytic activity. In the reaction of meta-substituted pyridylBenzenes, such as those having Me, OMe, CF3, and COOMe group at the meta position in the Benzene Ring, carbonylation takes place at the less hindered C−H b...