Title : Hydrogen-atom transfer in reactions of organic radicals with [Co(II)(por)]* (por = porphyrinato) and in subsequent addition of [Co(H)(por)] to olefins.

Pub. Date : 2009

PMID : 19266521






8 Functional Relationships(s)
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1 Hydrogen-atom transfer in reactions of organic radicals with [Co(II)(por)]* (por = porphyrinato) and in subsequent addition of [Co(H)(por)] to olefins. Alkenes cytochrome p450 oxidoreductase Homo sapiens
2 Hydrogen-atom transfer in reactions of organic radicals with [Co(II)(por)]* (por = porphyrinato) and in subsequent addition of [Co(H)(por)] to olefins. Alkenes cytochrome p450 oxidoreductase Homo sapiens
3 Hydrogen-atom transfer in reactions of organic radicals with [Co(II)(por)]* (por = porphyrinato) and in subsequent addition of [Co(H)(por)] to olefins. Alkenes cytochrome p450 oxidoreductase Homo sapiens
4 These reactions are relevant to catalytic chain transfer (CCT) in radical polymerization of olefins mediated by [Co(II)(por)](*), the formation and homolysis of organo-cobalt complexes that mediate living radical polymerization of vinyl acetate, and cobalt-mediated hydrogenation of olefins. Alkenes cytochrome p450 oxidoreductase Homo sapiens
5 These reactions are relevant to catalytic chain transfer (CCT) in radical polymerization of olefins mediated by [Co(II)(por)](*), the formation and homolysis of organo-cobalt complexes that mediate living radical polymerization of vinyl acetate, and cobalt-mediated hydrogenation of olefins. Alkenes cytochrome p450 oxidoreductase Homo sapiens
6 Insertion of vinyl acetate into the Co-H bond of [Co(III)(H)(por)] also proceeds over a low barrier (DeltaG(double dagger) = +11.4 kcal mol(-1)) hydrogen-transfer step from [Co(III)(H)(por)] to a carbon atom of the alkene to produce a close-contact radical pair. Alkenes cytochrome p450 oxidoreductase Homo sapiens
7 The computed energies obtained for the hydrogen-atom transfer reactions from (*)C(CH(3))(2)CN to [Co(II)(por)](*) and from [Co(H)(por)] to olefins, as well as the organo-cobalt bond homolysis energies correspond well with the experimental observations. Alkenes cytochrome p450 oxidoreductase Homo sapiens
8 The mechanism of alkene insertion into the Co-H bond of [Co(III)(H)(por)] is of general interest, because the species does not contain any cis-vacant sites to the hydride and the usual migratory insertion pathway is not available. Alkenes cytochrome p450 oxidoreductase Homo sapiens