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Dive into the research topics where Jean-Marc Chapuzet is active.

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Featured researches published by Jean-Marc Chapuzet.


Journal of Electroanalytical Chemistry | 2000

Boronic ester-substituted triphenylamines as new Lewis base-sensitive redox receptors

Mael Nicolas; Bruno Fabre; Jean-Marc Chapuzet; Jean Lessard; Jacques Simonet

Abstract Three triphenylamines mono-, di-, and trisubstituted by boronic ester(s) have been synthesized and their electrochemical behavior has been investigated in the absence and in the presence of F − as a guest anion. New redox systems assigned to each complexed form were observed at less positive potentials as a result of the stabilization of the radical cation species.


Tetrahedron | 1996

On the mechanism of alcoholysis of allylic and benzylic alcohols and of epoxides in the presence of ceric ammonium nitrate

Jean-Marc Chapuzet; Sophie Beauchemin; Benoit Daoust; Jean Lessard

Abstract The methanolysis of allylic alcohols, benzylic tertiary alcohols and epoxides in the presence of a catalytic amount of ceric ammonium nitrate (CAN) is shown to be catalysed by protons generated from the oxidation of methanol. This reaction is also catalysed by Lewis acids.


Journal of Electroanalytical Chemistry | 2001

The electrochemical reductive cleavage of a p-nitro-1,3-dioxolane and a p-nitro-1,3-dioxane in basic aqueous ethanol at Hg: electrolabile protecting groups of ketones

Jean-Marc Chapuzet; C Gru; R. Labrecque; Jean Lessard

The electroreductive cleavage of 4-(4′-nitrophenyl)-1,3-dioxolane (1) and of 7-nitro-1,3-benzodioxane (7) was studied at Hg in a basic hydroethanolic medium (EtOH+H2O 60:40 v/v, 0.15 M KOH). The voltammograms show classical behavior: peaks for the reversible substrate/radical anion redox couples (1/1− and 7/7−), a peak corresponding to further reduction of the radical anion to the hydroxylamine and peaks for the hydroxylamine/nitroso reversible redox couple at less negative potentials. Preparative electrolyses performed at the potential of the formation of the radical anion gave, in very good yields, cyclohexanone resulting from cleavage of the radical anion and show that these ketals are good electrolabile protecting groups. The influence of the electrolysis temperature is discussed. The electroreductive cleavage in basic ethanolic medium is more efficient than in aprotic medium.


Electrochimica Acta | 1997

Electrolabile protecting groups for ketones : the electrochemical reductive cleavage of 1,3-dioxolanes and 1,3-dioxanes containing nitro or halo groups

R. Labrecque; J. Mailhot; Benoit Daoust; Jean-Marc Chapuzet; Jean Lessard

Abstract The electroreductive cleavage of 4-(4′-nitrophenyl)-1,3-dioxolanes 1 , 7-nitro-1,3-benzodioxane 2 and 5-nitro-1,3-benzodioxanes 3 was studied in aprotic medium ( DMF / Et 4 NClO 4 (0.1 M)). The voltammetric behavior of these compounds showed the formation of a radical anion which is relatively stable on the time scale of cyclic voltammetry. When the electroreduction of these compounds was carried out at ca. −1.5 V vs Ag / Ag + (0.01 M ), at the potential of the formation of the radical anion, its cleavage did occur with the formation of the corresponding ketone. We also investigated the electroreduction of the 4-halomethyl- and 4,5-dihalomethyl-1,3-dioxolanes ( 4 and 5 ).


Journal of Electroanalytical Chemistry | 1993

The electrohydrogenation of 2-iodonitrobenzene at mercury and Raney metal electrodes in aqueous methanol

Benoît Côté; Daniel Despres; Richard Labrecque; Julie Lamothe; Jean-Marc Chapuzet; Jean Lessard

Abstract The electrohydrogenation of 2-iodonitrobenzene at mercury and Raney metal electrodes (R-Ni, R-Co and D-Cu) was studied in aqueous methanolic solutions. Four different media were used: a basic KOH medium (pH > 13), a neutral acetate buffered medium (pH 7) and two media containing a pyridine buffer (pH 3 and pH 10). Cyclic voltammetric reductions were carried out at mercury, bright nickel and bright copper cathodes. The product distribution of preparative-scale electrolyses at a mercury pool cathode was compared with that of electrohydrogenation at Raney metal electrodes and of catalytic hydrogenation (open-circuit experiments) at Raney metals. Electrohydrogenation at R-Co and D-Cu electrodes gave 2-iodoaniline with high selectivity ( ⩾ 94%). The results are discussed in the light of the various mechanistic pathways.


Journal of Agricultural and Food Chemistry | 2006

Electrochemical modification of the redox potential of pasteurized milk and its evolution during storage.

Marie-Pierre Bolduc; Laurent Bazinet; Jean Lessard; Jean-Marc Chapuzet; Jean-Christophe Vuillemard


Innovative Food Science and Emerging Technologies | 2008

Electrochemical modification of the redox potential of different milk products and its evolution during storage

Arnaud Schreyer; Michel Britten; Jean-Marc Chapuzet; Jean Lessard; Laurent Bazinet


Food Research International | 2008

Effect of electroreduction and heat treatments on oxidative degradation of a dairy beverage enriched with polyunsaturated fatty acids

Hélène J. Giroux; Jessika Bédard St-Amant; Patrick Fustier; Jean-Marc Chapuzet; Michel Britten


Archive | 2000

Radioactively coated device and method of making same for preventing restenosis

Guy Leclerc; Jeannette Fareh; Philippe Leblanc; Luc Levesque; Rémi Martel; Svetlana Kudrevich; Marcus F. Lawrence; Bernard Bourguignon; Jean Lessard; Sonia Blais; Jean-Marc Chapuzet; Michel Meunier; Teko W. Napporn; Suzie Poulin; E. Sacher; O. Savadogo


Desalination | 2006

Effect of milk fractions on the oxidoreduction potential evolution during electroreduction of milk

Arnaud Schreyer; Laurent Bazinet; Jean-Marc Chapuzet; Jean Lessard; Michel Britten

Collaboration


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Jean Lessard

Centre national de la recherche scientifique

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Michel Britten

Agriculture and Agri-Food Canada

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Jean Lessard

Centre national de la recherche scientifique

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Benoit Daoust

Université de Sherbrooke

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E. Sacher

École Polytechnique de Montréal

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Luc Levesque

Jewish General Hospital

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Michel Meunier

École Polytechnique de Montréal

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