Jean-Marc Chapuzet
Université de Sherbrooke
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Featured researches published by Jean-Marc Chapuzet.
Journal of Electroanalytical Chemistry | 2000
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
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
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
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
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
Marie-Pierre Bolduc; Laurent Bazinet; Jean Lessard; Jean-Marc Chapuzet; Jean-Christophe Vuillemard
Innovative Food Science and Emerging Technologies | 2008
Arnaud Schreyer; Michel Britten; Jean-Marc Chapuzet; Jean Lessard; Laurent Bazinet
Food Research International | 2008
Hélène J. Giroux; Jessika Bédard St-Amant; Patrick Fustier; Jean-Marc Chapuzet; Michel Britten
Archive | 2000
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
Arnaud Schreyer; Laurent Bazinet; Jean-Marc Chapuzet; Jean Lessard; Michel Britten