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39 results on '"Duclos, Marie-Christine"'

4. Chirality Effects on Repellent Properties of 4-Alkoxycoumarins Against Asian Tiger Mosquito (Diptera: Culicidae)

Author

Ramiharimanana, Fenia Diane, primary, Andrianjafy, Mbolatiana Tovo, additional, Ramarosandratana, Niry Hasinandrianina, additional, Andrianarijaona, Toavina Elodie, additional, Rambala Rakotomena, Ny Aina Harivony, additional, Metay, Estelle, additional, Duclos, Marie-Christine, additional, Cinquin, Valentin, additional, Mavingui, Patrick, additional, Vestalys Ramanandraibe, Voahangy, additional, and Lemaire, Marc, additional

Published
2022
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6. CNSL oxyacetic derivatives, new bio-based binders for paint preparation

Author

Ranarijaona, Miarintsoa Michaële, Rafanoela, Sandratriniaina Hermann, Herinirina, Lydia Clarisse, Duclos, Marie Christine, Lavaud, Alban Léon, Goux-Henry, Catherine, Métay, Estelle, Vestalys, Voahangy Ramanandraibe, and Lemaire, Marc

Abstract

The global coating industry produces tens of millions of metric tonnes of paints each year, and this quantity continues to grow. Most of these paints are obtained totally or partially from fossil resources, and many of them still use volatile organic compounds (VOCs) and/or other harmful chemicals. This paper describes the use of the cashew nutshell liquid (CNSL) as a raw material for synthesis of paint binders (sustainable materials). These binders are obtained in a single chemical step without tedious separation. These new bio-based materials (renewable resources) form stable films (green coatings) in a short drying time. The formulated paints are 100% aqueous, have low toxicity and ecotoxicity and require no additional drying agents or VOCs. Oxidative coupling of the alkylidene chain and addition of carboxylic acid to the carbon–carbon double bonds are implemented. The products obtained can be applied on different kinds of surfaces, such as glass slides, metal, wood or concrete, and exhibit good stability against various solvents and tropical conditions.

Published
2023
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14. One-Pot, Solvent-Free Access to Unsymmetrical Ureas by Palladium-Catalysed Reductive Alkylation Using Molecular Hydrogen

Author

Mohy El Dine, Tharwat, Chapron, Simon, Duclos, Marie-Christine, Duguet, Nicolas, Popowycz, Florence, Lemaire, Marc, Catalyse Synthèse et Environnement (CASYEN), Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (ICBMS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
inorganic chemicals, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Reductive alkylation, Synthetic methods, Palladium, Hydrogenation, Ureas, [CHIM.CATA]Chemical Sciences/Catalysis
Abstract

International audience; Unsymmetrical N,N′-disubstituted ureas were prepared in 60–93 % isolated yield by palladium-catalysed reductive alkylation of monosubstituted ureas using aldehydes as alkylating agents and molecular hydrogen as a clean reductant. A one-pot, solvent-free sequence was also developed from the corresponding amines.

Published
2013
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15. One-pot, solvent-free access to unsymmetrical ureas by palladium-catalyzed reductive alkylation usning molecular hydrogen

Author

Dine, Tharwat Mohy El, Chapron, Simon, Duclos, Marie-Christine, Duguet, Nicolas, Popowycz, Florence, Lemaire, Marc, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (ICBMS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), Catalyse Synthèse et Environnement (CASYEN), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
Ureas, Synthetic methods, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Hydrogenation, Reductive alkylation, Palladium
Abstract

International audience; Palladium-catalysed reductive alkylation of monosubstituted ureas has been studied in the presence of aldehydes and using molecular hydrogen as a clean reductant. Unsymmetrical N,N′-disubstituted ureas were formed in good to excellent isolated yields (60–93 %) without the production of salt waste. This reaction was incorporated to a one-pot, solvent-free sequence involving the alkylation of monosubstituted ureas generated in situ from the corresponding amines.

Published
2013

29. Chemically and Electrochemically Triggered Assembly of Viologen Radicals: Towards Multiaddressable Molecular Switches.

Author

Kahlfuss, Christophe, Métay, Estelle, Duclos, Marie ‐ Christine, Lemaire, Marc, Milet, Anne, Saint ‐ Aman, Eric, and Bucher, Christophe

Subjects
VIOLOGENS, DIMERS, ELECTRODES, BIPYRIDINIUM compounds, PYRIDINIUM compounds, DIMERIZATION, CALIXARENES
Abstract

We have established that bipyridinium radicals can be reversibly π-dimerized under the combined effects of chemical (proton transfer) and electrochemical (electron transfer) stimuli. Our investigations also led to the discovery that a bis-pyridinyl appended calixarene intermediate is involved in a fully reversible redox-triggered σ-dimerization process. The structure of the most stable intramolecular σ-dimer was provided by computational chemistry and its complete conversion into a noncovalent π-dimer could be triggered chemically by addition of protons, leading to the formation of protonated cation radicals. Theoretical data collected with the N-methylated and N-protonated π-dimers also support the existence of multivariant orientations in π-bonded dimers of viologen cation-radicals. [ABSTRACT FROM AUTHOR]

Published
2015
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33. O-Alkylation of phenol derivatives viaa nucleophilic substitution.

Author

Cazorla, Clément, Pfordt, Émilie, Duclos, Marie-Christine, Métay, Estelle, and Lemaire, Marc

Subjects
ALKYLATION, PHENOL, NUCLEOPHILIC reactions, LEWIS acids, CATALYSTS recycling, WATER, HYDROCARBONS
Abstract

The alkylation of phenol derivatives can be achieved in good yield viaLewis or Brønsted acid. The only by-product of the reaction is water and the catalyst can be recycled when using Brønsted acid. [ABSTRACT FROM AUTHOR]

Published
2011
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34. Synthesis and AnionBinding Properties of Novel RedoxActive Calixarene Receptors

Author

Métay, Estelle, Duclos, Marie Christine, PelletRostaing, Stéphane, Lemaire, Marc, Schulz, Jürgen, Kannappan, Ramu, Bucher, Christophe, SaintAman, Eric, and Chaix, Carole

Abstract

A novel synthetic approach towards redoxactive calixarenebased receptors is described in which ferrocene fragments were introduced at the lower rim through anionbinding urea or amide connections. These derivatives were prepared in one pot by treating an aminecontaining calixarene with ferrocenecarboxylic acid in the presence of diphenylphosphoryl azide and diisopropylethylamine. This method allows a convergent approach to these receptors and is readily adaptable to the introduction of other urea substituents. The anionbinding properties of these artificial receptors have been revealed by NMR spectroscopy and thoroughly investigated by electrochemical methods. We have assessed the importance of the urea–phosphate bonds in the observed electrochemical response by studying receptors in which the ferrocene reporters and binding fragments are closely associated or fully disconnected through a long alkyl chain. The experimental results clearly show the utmost importance of ionpairing effects in the electrochemical recognition process, which account for most of the transduction signal in organic apolar media. © WileyVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008

Published
2008
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38. Chemically and electrochemically triggered assembly of viologen radicals: towards multiaddressable molecular switches.

Author

Kahlfuss C, Métay E, Duclos MC, Lemaire M, Milet A, Saint-Aman E, and Bucher C

Abstract

We have established that bipyridinium radicals can be reversibly π-dimerized under the combined effects of chemical (proton transfer) and electrochemical (electron transfer) stimuli. Our investigations also led to the discovery that a bis-pyridinyl appended calixarene intermediate is involved in a fully reversible redox-triggered σ-dimerization process. The structure of the most stable intramolecular σ-dimer was provided by computational chemistry and its complete conversion into a noncovalent π-dimer could be triggered chemically by addition of protons, leading to the formation of protonated cation radicals. Theoretical data collected with the N-methylated and N-protonated π-dimers also support the existence of multivariant orientations in π-bonded dimers of viologen cation-radicals., (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2015
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39. Acid deprotection of covalently immobilized peptide probes on glass slides for peptide microarrays.

Author

El Khoury G, Laurenceau E, Dugas V, Chevolot Y, Mérieux Y, Duclos MC, Souteyrand E, Rigal D, Wallach J, and Cloarec JP

Subjects
Amino Acid Sequence, Antibodies chemistry, Biotinylation, Enzyme-Linked Immunosorbent Assay methods, Equipment Design, Humans, Ligands, Molecular Sequence Data, Glass, Histones chemistry, Immunoglobulin G chemistry, Peptide Library, Peptides chemistry, Protein Array Analysis instrumentation, Proteins chemistry
Abstract

Protein microarray technology has shown great advancements in the field of biomedical research and diagnosis, it allows to study and understand protein activities and protein - ligand interactions (e.g. detection of antigen-autoantibody interaction in autoimmune diseases. Autoantibodies are frequently targeted against antigens of the cell nucleus (double and single stranded DNA, histones, and nuclear antigens). The biological activities of proteins (e.g. enzymes, antibodies...) are controlled by peptides sequences of the active site. Consequently, we were interested in the investigation of peptide microarrays in order to further implement in situ peptide synthesis, in particular, deprotection reaction on glass supported peptides. In this work, a protected and biotinylated synthetic peptide was covalently immobilized onto amino functionalized glass surface by activation of its the C-terminus; this allows to orientate the peptide onto the surface. The peptide contains a fragment of the C-terminal end of the human histone H3 protein. The immobilized peptide was then deprotected by using concentrated trifluoroacetic acid solution. After the deprotection, surface stability and peptide grafting density were evaluated by indirect labelling of the immobilized peptide using Cy3 streptavidin conjugates. We also studied biological interaction of IgG polyclonal anti-histone H3 antibody with the immobilized peptide epitope to insure the efficiency of the acid deprotection. The specificity of the antibody interaction with the protected versus non protected peptides. This approach may be applied to in situ synthetic and prototected peptides, in order to elaborate a micro-immunoassay prototype for measurement of peptide-protein interactions on high density microarrays, and detection of antibodies in biological fluids such as serum.

Published
2007
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