- Electron Transfer Oxidation of Benzene and Aerobic Oxidation to Phenol
-
The activation of very strong C-H bonds, such as those found in benzene, is important also in the quest for new routes for its functionalization. Using the H5PV2Mo10O40 polyoxometalate as an electron transfer oxidant in >50% aqueous H2SO4 as solvent, the formation of a benzene radicaloid species at RT as probed by visible spectroscopy and by EPR spectroscopy recorded at X-band and W-band, including ELDOR-detected NMR, was verified. The viability of the ET oxidation of benzene is supported by DFT calculations, showing the reaction to be exergonic under these conditions. Furthermore, we show that in the presence of O2, very selective hydroxylation to phenol took place.
- Sarma, Bidyut Bikash,Carmieli, Raanan,Collauto, Alberto,Efremenko, Irena,Martin, Jan M. L.,Neumann, Ronny
-
-
Read Online
- Reactivity of a Ru(iii)-hydroxo complex in substrate oxidation in water
-
A mononuclear RuIII-OH complex oxidizes substrates such as hydroquinones in water through a pre-equilibrium process based on adduct formation by hydrogen bonding between the RuIII-OH complex and the substrates. The reaction mechanism switches from hydrogen atom transfer to electron transfer depending on the oxidation potential of substrates. This journal is
- Ohzu, Shingo,Ishizuka, Tomoya,Kotani, Hiroaki,Kojima, Takahiko
-
supporting information
p. 15018 - 15021
(2015/02/19)
-
- Chemical consequences of fluorine substitution. Part 4. Diels-Alder reactions of fluorinated p-benzoquinones with Dane's diene. Synthesis of fluorinated D-homosteroids
-
Four fluorinated p-benzoquinones (2) have been reacted with Dane's diene (1) in Diels-Alder reactions and the formed fluorinated D-homosteroids were characterized. The number of products, their stereochemistry and stability depends on the fluorine substitution pattern of the corresponding fluorinated p-benzoquinones. If the p-benzoquinone (2) contains an unfluorinated double bond, this bond reacts faster with diene 1 yielding endo-products selectively. In contrast, [4+2]cycloadditions with 2,6-difluoro (2c) and 2,3,5,6-tetrafluorobenzoquinone (2d) gave the products with exo-orientation of the carbonyl part preferably.
- Essers, Michael,Haufe, Guenter
-
p. 2719 - 2728
(2007/10/03)
-