Singlet Oxygen Mediated Oxidation of Olefins within Zeolites: Selectivity and Complexities
作者:J. Shailaja、J. Sivaguru、Rebecca J. Robbins、V. Ramamurthy、R.B. Sunoj、J. Chandrasekhar
DOI:10.1016/s0040-4020(00)00513-5
日期:2000.9
trisubstituted alkenes, hydroperoxidation withinzeolites occurs with a certain amount of regioselectivity. The oxidationwithinzeolites is accompanied by photodecomposition of the dye and the product hydroperoxides and acid catalyzed rearrangement of the alkenes. In order to understand the observed selectivity, ab initio and DFT calculations on model systems have been performed. The calculations
Ring-Opening Metathesis Polymer Sphere-Supported <i>s</i><i>eco</i>-Porphyrazines: Efficient and Recyclable Photooxygenation Catalysts
作者:Matthew J. Fuchter、Brian M. Hoffman、Anthony G. M. Barrett
DOI:10.1021/jo052156t
日期:2006.1.1
subsequently converted into its zinc seco-derivative. Polymerization gave the corresponding ROMPgel and ROMPsphere (ROMP = ring-opening metathesis polymer) reagents, the latter of which proved efficient as an immobilized catalyst for the sensitized production of singlet oxygen for the purification-minimized parallelsynthesis of endoperoxides and ene adducts.
9-Mesityl-10-methylacridinium: An Efficient Type II and Electron-Transfer Photooxygenation Catalyst
作者:Axel G. Griesbeck、Miyeon Cho
DOI:10.1021/ol0628661
日期:2007.2.1
monoalkenes and molecular oxygen leads to typical products of singlet oxygen addition (type II photooxygenation). The molecular probes 1-methylcyclohexene and limonene, respectively, result in hydroperoxide mixtures with a characteristic product pattern. A switch in the oxidative mechanism (electron-transferphotooxygenation) is observed for naphthalene derivatives as electron-rich acceptor molecules, revealing
Generation and reactivity of singlet oxygen within zeolites: remarkable control of hydroperoxidation of alkenes
作者:Rebecca J. Robbins、V. Ramamurthy
DOI:10.1039/a700977a
日期:——
A highly selective oxidation of alkenes included within a Y zeolite is
achieved by generating singlet oxygen via excitation of a
monomeric dye exchanged within a zeolite; conformational control brought
forth by the medium is suggested to be responsible for the observed
remarkable selectivity.
Regioselectivity in the ene reaction of singlet oxygen with alkenes bearing an electron withdrawing group at β- position
作者:Manolis Stratakis、Michael Orfanopoulos
DOI:10.1016/s0040-4039(96)02469-0
日期:1997.2
Electronic repulsions between a perepoxide intermediate and the allylic functionality in the product forming transition state, direct the regioselectivity in the photooxygenation of trisubstituted alkenes bearing an electron withdrawing group at β- position.