Selective alkene epoxidation by molecular oxygen in the presence of aldehyde and different type catalysts containing cobalt
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Aerobic epoxidation of limonene using cobalt substituted mesoporous SBA-16 Part 1: Optimization via Response Surface Methodology (RSM)
2020, Applied Catalysis B: EnvironmentalCitation Excerpt :Thus, in principle, this process could also be the rate limiting process. Similar dependencies observed by Kholdeeva [66] and Wentzel [55] for the effect of Co(II) and Ni(II) concentrations on oxidation rates were given another explanation. These authors suggested that increasing the amount of Co catalyst inhibited the reaction owing to its participation in chain termination which would prevent the formation of the cobalt-peroxo radical species or convert it into a non-radical peroxo anion.
Synthesis and post-metalation of a covalent-porphyrinic framework for highly efficient aerobic epoxidation of olefins
2017, Catalysis CommunicationsCitation Excerpt :The TON reached to 29,215 without loss of the catalytic activity in the following runs. It has been well known that the aerobic oxidation of olefins with IBA proceeds through a peroxyl radical mechanism [31,32]. At first, cobalt-porphyrin reacts with IBA to generate an acyl radical [(CH3)2CHC(O)], which would react with O2 to produce an acylperoxy radical [(CH3)2CHC(O)OO] to realize molecular oxygen activation.
Aerobic oxidations of α-pinene over cobalt-substituted polyoxometalate supported on amino-modified mesoporous silicates
2007, Journal of CatalysisCitation Excerpt :Importantly, this method can be applied even for the production of acid-sensitive epoxides. The selective α-pinene epoxidation via co-oxidation with branched aliphatic aldehydes has been reported to proceed efficiently in the presence of both homogeneous Ni(II) and Co(II) catalysts [11,14,25,26,33,38], as well as over solid CoNaY [39]; however, the latter was not stable with respect to leaching of cobalt under the reaction conditions. Transition metal-substituted polyoxometalates are attracting much attention as oxidation catalysts because of their numerous unique properties, including metal oxide-like structure and thermodynamic stability to oxidation [40–49] and their ability to be supported on different porous materials [50–61], for example, attached to NH2-modified silica surfaces by dative [55] or electrostatic binding [51,54,61].
Polyoxometalates: Reactivity
2004, Comprehensive Coordination Chemistry IIOxidation of aldehydes using silica-supported Co(II)-substituted heteropolyacid
2001, Journal of Molecular Catalysis A: Chemical