12 research outputs found
«Synthèses de résines thermoplastiques par modifications chimiques de matières premières amylacées»
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«Diamine derivatives of isohexide through direct Ru-catalyzed amination in presence of ammonia»
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«Bio-based monomers synthesis via rhodium-catalyzed poly-allyl ether hydroformylation»
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Epimerization of isosorbide catalyzed by homogeneous ruthenium-phosphine complexes: A new step towards an industrial process
No full textInternational audienceAn efficient process for obtaining isoidide by catalytic epimerization of isosorbide using HRu(CO)Cl(PPh3)3/Xantphos (1/1) as organometallic catalyst without hydrogen is reported. The epimerization of isosorbide led to a thermodynamic equilibrium mixture containing 37% isosorbide, 57% isoidide and 6% isomannide in 1 h at 170 °C in tert-amyl alcohol. The same proportions were reached by using the catalytic precursor HRu(CO)Cl(PPh3)3 associated with sulfonated phosphines to isomerize isosorbide without solvent. Interestingly, the reaction can be also performed in a biphasic system (isosorbide/toluene) with the same catalytic activity. In this case, the mixture of isohexides was easily separated from toluene catalytic phase. Thus, by adding in each time a new isosorbide layer, nine successive cycles were performed without a loss of the catalytic activity. A scale-up leading to isomerize 1.3 Kg of isosorbide using only 0.2 g of ruthenium was also performed showing the potentiality of this biphasic catalytic system for an industrial application
«Transformation de poly-éthers allyliques en poly-aldéhydes via la réaction d'hydroformylation catalysée au rhodium»
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«Development of heterogeneous catalytic systems for the production of biosourced furan molecules of interest»
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Overview of the literature on the catalytic processes used for sorbitol double dehydration to isosorbide
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Overview of the literature on the catalytic processes used for sorbitol double dehydration to isorsobide
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