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Electron transfer ring opening

Isoxazolones, electron transfer ring opening reactions of 89YGK629. [Pg.70]

Albini, A. and Arnold, D. R., The photosensitized (electron transfer) ring opening of aryloxiranes. [Pg.1058]

As with other hydroperoxides, hydroxyaLkyl hydroperoxides are decomposed by transition-metal ions in an electron-transfer process. This is tme even for those hydroxyaLkyl hydroperoxides that only exist in equiUbrium. For example, those hydroperoxides from cycHc ketones (R, R = alkylene) form an oxygen-centered radical initially which then undergoes ring-opening -scission forming an intermediate carboxyalkyl radical (124) ... [Pg.113]

Reductive ring opening of epoxides in radical reactions in presence of titanocenes as electron transfer catalysts 98SL801. [Pg.243]

Electron transfer to vinylaziridines results in ring-opening reactions, yielding allyl amines. Treatment of 268 with SmI2/DMEA (N,N-dimethylethanolamine) provided allyl amine 269 as a 2 1 mixture of olefmic isomers in 88% yield (Scheme 2.66) [97]. [Pg.68]

Scheme 2.66 Ring-opening reactions resulting from electron transfer. Scheme 2.66 Ring-opening reactions resulting from electron transfer.
The ESR spectrum of the furan radical anion indicates that the Cem-0 bond is ruptured in the electron transfer process whereby the oxygen atom acquires the negative charge and the C-2 end of the open ring possesses a free radical character ... [Pg.58]

Electron-transfer activation. The photoinduced electron-transfer activation of the [DBC, TCNE] complex generates the DBC+ cation radical, which undergoes a fast electrocyclic ring opening, i.e.,... [Pg.265]

Takahashi et al. (1996) described another case of cation-radical cycloreversion. Benzocyclobu-tenols undergo ring opening induced by electron transfer to generate quinodimethide intermediates, which then tautomerize to benzophenones. The reaction proceeds on photoirradiation in the presence of tetracyanoanthracene (X > 350 nm). Yields (based on NMR (proton) analyses) are quantitative... [Pg.379]


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Electron Ring

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