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• W2052687382 endingPage "45" @default.
• W2052687382 startingPage "37" @default.
• W2052687382 abstract "Oxidation of norbornene has been carried out over mono-, di- and tri-vanadium-substituted phosphomolybdic acid catalysts with aqueous hydrogen peroxide (aq. H2O2) as an oxidant in different solvents. Monovanadium-substituted phosphomolybdic acid catalyst was found to be better than other catalysts for the above reaction and acetonitrile was the suitable solvent. At the optimum temperature of 60 °C, the norbornene conversion was 70% and the selectivity for 2,3-epoxy norbornane was 58%. The side products were norborneols and 2-norbornanone. The lower selectivity of 2,3-epoxy norbornane with aq. H2O2 is attributed to the simultaneous formation of other products, norborneols and 2-norbornanone. The norborneols are formed from norbornene by acid-catalyzed reaction. Other oxidants like urea–hydrogen peroxide adduct (UHP) and tert-butyl hydrogen peroxide (TBHP) were also tested for norbornene oxidation reaction. With UHP, the conversion was almost same (69%) as that of aq. H2O2 reaction; however, 2,3-epoxy norbornane was the main product with >97% selectivity. Thus, the overall yield was 66.9% at 60 °C after 4 h. The high selectivity with UHP is attributed to the controlled release of H2O2, absence of water and less acidic nature of UHP. With TBHP the selectivity for the epoxide was >96%; however, the conversion was low (27%). A mechanism for the norbornene oxidation is believed to be proceeding via V(5+)-peroxo and V(4+)-superoxo intermediates. NMR, EPR and UV–vis spectroscopic techniques were employed to understand the reaction intermediates and reaction pathways." @default.
• W2052687382 created "2016-06-24" @default.
• W2052687382 creator A5033898540 @default.
• W2052687382 creator A5057712034 @default.
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• W2052687382 date "2005-03-01" @default.
• W2052687382 modified "2023-09-27" @default.
• W2052687382 title "Oxidation of norbornene over vanadium-substituted phosphomolybdic acid catalysts and spectroscopic investigations" @default.
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• W2052687382 doi "https://doi.org/10.1016/j.molcata.2004.10.005" @default.
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