Fraternité, Solidarité & complémentarité en Catalyse: Tandem alkene cross-metathesis of acrylonitrile with long-chain alkene and hydrogenation catalysis is performed by using a single ruthenium-alkylidene catalyst precursor. The protocol allows the catalytic transformation of unsaturated fatty acids, derivatives of plant oils, into α,ω-aminoesters. A key step involves the reduction of nitrile-ester intermediates into aminoesters, the precursors of polyamides, with alkene metathesis catalyst residue under mild conditions.
"Among renewables, fatty acid methyl esters (FAMEs) arising from plant oils have recently received attention for the production of polymer precursors obtained by efficient and selective cross‐metathesis transformations  . In particular, cross‐metathesis reactions with ethylene      , methyl acrylate   and acrylonitrile    have been extensively studied for the synthesis of polyolefin, polyester, and polyamide precursors, respectively. Acrolein is another important acrylic reagent of high potential as the formyl group provides a direct access to a broad range of organic functionalities. "
[Show abstract][Hide abstract] ABSTRACT: The cross-metathesis of renewable fatty acid methyl esters with acrolein was investigated. The bifunctional formyl-esters obtained are interesting compounds for further transformations into bifunctional polymer precursors. Several experimental parameters and ruthenium catalysts have been evaluated. Best results were obtained with thermally pre-treated fatty acid methyl esters (FAMEs). The reactions performed with high efficiency with low catalyst loadings allowing TONs as high at 1000. An acetal protected acrolein was also used, enabling improvement of the reaction performances. A tandem cross-metathesis/hydrogenation reaction without isolation of the formyl intermediate delivered the expected alcohol ester in good yield.Practical applications: The cross-metathesis of FAMEs with acrolein provides access to a broad range of bifunctional compounds of interest for the manufacture of polymers, considering the multiple post-transformations of the formyl group availableThe ruthenium-catalyzed cross-metathesis of fatty acid methyl esters with acrolein is presented. The bifunctional formyl-esters are valuable precursors for subsequent transformations such as the tandem cross-metathesis/hydrogenation reaction delivering a hydroxyl-ester in one step.
European Journal of Lipid Science and Technology 10/2014; 117(2). DOI:10.1002/ejlt.201400362 · 1.81 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Catalytic and crystallographic studies of Hoveyda–Grubbs type pre-catalysts M51TM and M52TM were performed. These two new instruments in the olefin metathesis catalyst toolbox were shown to be active at ambient temperature and at low loading, leading to clean formation of ring-closing, ring-closing enyne and cross metathesis products.
[Show abstract][Hide abstract] ABSTRACT: The modification of methyl ricinoleate by etherification of the hydroxyl group was accomplished by using a nonclassical ruthenium-catalyzed allylation reaction and also by esterification. Methyl ricinoleate derivatives were engaged in ring-closing metathesis (RCM) reactions leading to biosourced 3,6-dihydropyran and α,β-unsaturated lactone derivatives with concomitant production of polymer precursors. Sequential RCM/hydrogenation and RCM/cross-metathesis were also implemented as a straightforward method for the synthesis of tetrahydropyran and lactone derivatives as well as valuable monomers (i.e., polyamide precursors).
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