Catalytic oxidative carboncarbon bond cleavage of ketones with dioxygen: assessment of some metal complexes. Some alternatives for preparing α, ω-dicarboxylic acids
Identifieur interne : 000277 ( France/Analysis ); précédent : 000276; suivant : 000278Catalytic oxidative carboncarbon bond cleavage of ketones with dioxygen: assessment of some metal complexes. Some alternatives for preparing α, ω-dicarboxylic acids
Auteurs : Jean-Marie Brégeault [France] ; Franck Launay [France] ; Ahmed Atlamsani [Maroc]Source :
- Comptes Rendus de l'Academie des Sciences Series IIC Chemistry [ 1387-1609 ] ; 2001.
English descriptors
- KwdEn :
- acide adipique, adipic acid, copper(II) catalysts, coupure oxydante des liaisons carbonecarbone, cuivre(II) en catalyse, cyclohexane, cyclohexanone, cyclohexene, cyclohexène, cétones, dioxygen, dioxygène, ketones, oxidative cleavage of carboncarbon bonds, polyoxometalates, polyoxométallates, polyoxoperoxometalates, polyoxoperoxométallates, redox molecular sieves, tamis moléculaires redox.
Abstract
This account considers the catalytic oxidative cleavage of ketones with dioxygen. It can be brought about by Keggin-type heteropolyanion complexes containing molybdenum and vanadium as well as by several transition metal catalysts (V(IV, V), Cu(I, II), Fe(III), Ce(IV), etc.), instead of using stoichiometric oxidation with periodate, lead tetra-acetate, etc. Benzylic ketones, ArCH2C(O)R are oxidised to ArCHO and the corresponding carboxylic acid in high yield at room temperature by dioxygen in the presence of Cu(II) or heteropolyacids H3+n[PMo12−nVnO40]aq. Although some oxovanadium complexes will induce such oxidations, the heteropolyacids are better, probably due in part to their Brønsted acidity and ability to take part in a variety of equilibria. Treatment of substituted cycloalkanones with a catalytic amount of ‘H5[PMo10V2O40]·nH2O’ (or Cu(II) complexes) under an O2 atmosphere gives keto-acids in good yield. The selectivities observed at high conversions with various ketones and diols, coupled with the mild conditions and inexpensive oxidant, would seem to make these methods attractive for use in fine chemical manufacture. The scope of these complexes as selective oxidation catalysts can be further extended by associating several metal ions. Such catalysts are being developed for organic synthesis at both the laboratory and industrial scale. Alternative routes to adipic acid involving cyclohexanone, cyclohexene, cyclohexane, etc. and polyoxo(peroxo)metalates or redox molecular sieves as liquid-phase oxidation catalysts, are compared. Alternatives, both biochemical and chemical, are being sought.
Url:
DOI: 10.1016/S1387-1609(00)01228-2
Affiliations:
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ISTEX:89F3E0559C7D6AD46C60B532806B373E84776786Le document en format XML
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<front><div type="abstract" xml:lang="en">This account considers the catalytic oxidative cleavage of ketones with dioxygen. It can be brought about by Keggin-type heteropolyanion complexes containing molybdenum and vanadium as well as by several transition metal catalysts (V(IV, V), Cu(I, II), Fe(III), Ce(IV), etc.), instead of using stoichiometric oxidation with periodate, lead tetra-acetate, etc. Benzylic ketones, ArCH2C(O)R are oxidised to ArCHO and the corresponding carboxylic acid in high yield at room temperature by dioxygen in the presence of Cu(II) or heteropolyacids H3+n[PMo12−nVnO40]aq. Although some oxovanadium complexes will induce such oxidations, the heteropolyacids are better, probably due in part to their Brønsted acidity and ability to take part in a variety of equilibria. Treatment of substituted cycloalkanones with a catalytic amount of ‘H5[PMo10V2O40]·nH2O’ (or Cu(II) complexes) under an O2 atmosphere gives keto-acids in good yield. The selectivities observed at high conversions with various ketones and diols, coupled with the mild conditions and inexpensive oxidant, would seem to make these methods attractive for use in fine chemical manufacture. The scope of these complexes as selective oxidation catalysts can be further extended by associating several metal ions. Such catalysts are being developed for organic synthesis at both the laboratory and industrial scale. Alternative routes to adipic acid involving cyclohexanone, cyclohexene, cyclohexane, etc. and polyoxo(peroxo)metalates or redox molecular sieves as liquid-phase oxidation catalysts, are compared. Alternatives, both biochemical and chemical, are being sought.</div>
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