Papers by christophe duplais
Chemistry-a European Journal, 2010
Screening of different sources of Pd/C shows reagents of highly variable nanoparticle sizes and o... more Screening of different sources of Pd/C shows reagents of highly variable nanoparticle sizes and oxidation states of the metal. Typically, catalysts with higher surface area are viewed as likely to be the more reactive. In this paper a new form of Pd/C, "UC Pd" is described that is shown to contain larger nanoparticles yet it is the most reactive catalyst of those sold commercially for Sonogashira coupling reactions. UC Pd functions efficiently in the absence of a copper co-catalyst, under very mild and "green" conditions using inexpensive 95% EtOH at 50 degrees C. It is also the only form of Pd/C that can be recycled. In side-by-side reactions with several commercially available forms of Pd/C, none compete successfully with UC Pd under standardized conditions. Physical data obtained from extensive surface analysis using TEM, XRD, XPS, and CO-TPD measurements lead to an explanation behind the unique reactivity of this new recyclable form of Pd/C.
Cheminform, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Topics in Catalysis, 2010
New methodologies that enable palladium catalyzed cross-coupling reactions to be performed under ... more New methodologies that enable palladium catalyzed cross-coupling reactions to be performed under environmentally benign conditions (in water and/or at room temperature) have been developed. Described approaches involve in situ activation of carbon–halogen or carbon–hydrogen bonds using zinc metal, or cationic palladium, respectively.
Cheminform, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron Letters, 2011
Zn-mediated, Pd-catalyzed cross-coupling reactions between heteroaromatic and alkyl halides can b... more Zn-mediated, Pd-catalyzed cross-coupling reactions between heteroaromatic and alkyl halides can be done at room temperature in pure water using a commercially available Pd catalyst and PTS, a nanomicelle-forming amphiphile. Notably, zinc metal inserts selectively into a carbon sp3-halide bond, while palladium adds oxidatively to a carbon sp2-bond.
Cheminform, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Chemical Communications, 2010
A remarkably simple entry to unsymmetrical diarylmethanes has been developed that relies on an in... more A remarkably simple entry to unsymmetrical diarylmethanes has been developed that relies on an in situ organozinc-mediated, palladium-catalyzed cross-coupling. Thus, by mixing a benzyl and aryl halide together in the presence of Zn metal and a Pd catalyst, diarylmethanes are formed at room temperature without assistance by a surfactant; hence, "on water".
Journal of The American Chemical Society, 2009
Mix in water, stir. That is all that is required in this new approach to sp(3)-sp(2) cross-coupli... more Mix in water, stir. That is all that is required in this new approach to sp(3)-sp(2) cross-couplings between an alkyl iodide and an aryl bromide, both potentially bearing functionality. They react under catalysis by Pd(0) in the presence of zinc powder, aided by a nonionic amphiphile, to give the alkylated aromatic. No organic solvents and no heating; just add water.
Angewandte Chemie-international Edition, 2009
Cheminform, 2009
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Cheminform, 2008
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Synfacts, 2007
Sustainable development now plays an increasingly important role in the strategy of chemical indu... more Sustainable development now plays an increasingly important role in the strategy of chemical industries. As a part of this preoccupation, the search for more economic and more ecofriendly new efficient synthetic methods is of vital concern. The development of iron-catalyzed cross-coupling reactions is one of the current promising fields of research, as these reactions are very attractive compared to the related palladium-or nickel-catalyzed procedures extensively used until now. This is well illustrated by the numerous results published by us [1] and others. Note that for large-scale applications, it is not enough to use iron salts as catalysts; it is also important to use cheap ligands in small amounts as well as solvents that are compatible with industrial processes.
Organic Letters, 2009
Bromides. -(CAHIEZ*, G.; CHABOCHE, C.; DUPLAIS, C.; MOYEUX, A.; Org. Lett. 11 (2009) 2, 277-280; ... more Bromides. -(CAHIEZ*, G.; CHABOCHE, C.; DUPLAIS, C.; MOYEUX, A.; Org. Lett. 11 (2009) 2, 277-280; Dep. Chem., CNRS, Univ. Paris 13, F-93017 Bobigny, Fr.; Eng.) -Nuesgen 24-049
Cheminform, 2008
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Cheminform, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Organic Letters, 2009
Bromides. -(CAHIEZ*, G.; CHABOCHE, C.; DUPLAIS, C.; MOYEUX, A.; Org. Lett. 11 (2009) 2, 277-280; ... more Bromides. -(CAHIEZ*, G.; CHABOCHE, C.; DUPLAIS, C.; MOYEUX, A.; Org. Lett. 11 (2009) 2, 277-280; Dep. Chem., CNRS, Univ. Paris 13, F-93017 Bobigny, Fr.; Eng.) -Nuesgen 24-049
Journal of The American Chemical Society, 2007
ABSTRACT Atmospheric oxygen was used for the first time as an oxidant in metal-catalyzed homocoup... more ABSTRACT Atmospheric oxygen was used for the first time as an oxidant in metal-catalyzed homocoupling of Grignard reagents. These manganese- or iron-catalyzed reactions are efficient, cheap, and eco-friendly. They are applicable to the large-scale synthesis of symmetrical conjugated compounds.
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Papers by christophe duplais