Photochemical oxygenation

Rodgers, M.A.J. and Bates A.L. 1980. Kinetic and spectroscopic features of some carotenoid triplet states Sensitization by singlet oxygen. Photochem. Photobiol. 31 533-537. 

El-Agamey, A, Cantrell, A, Land, EJ, McGarvey, DJ, and Truscott, TG, 2004a. Are dietary carotenoids beneficial Reactions of carotenoids with oxy-radicals and singlet oxygen. Photochem Photobiol Sci 3, 802-811. 

Redmond, RW and Kochevar, IE, 2006. Spatially resolved cellular responses to singlet oxygen. Photochem Photobiol 82, 1178-1186. 

In a procedure to oxygenate photochemically COT to the 1,4-endoperoxide, highly explosive undefined polymeric peroxides are formed as by-products. 

Moan J, Berg K (1991) The photodegradation of porphyrins in cells can be used to estimate the lifetime of singlet oxygen. Photochem Photobiol 53 549-553. 

Schmidt R (2006) Photosensitized generation of singlet oxygen. Photochem Photobiol 82 1161-1177... 

Most mechanistic studies " have utilized lV,Al-diphenylmethyl-amine. With this substrate in the absence of oxygen, photochemical cyclization to the observable 312 (R = H, R = Me) is followed by disproportionation to the carbazole and to a tetrahydrocarbazole believed to be... 

D.L. Kearn and A.U. Khan, Sensitized photooxygenation reactions and the role of singlet oxygen , Photochem. Photobio., 10, 1969, 193. 

This approach was applied later to synthesize substituted 2-benzopyrylium salts 4 (85LA2116) via 1,5-diketones 3, and a few dioxetanes 2 were isolated as intermediates on using singlet oxygen photochemically (74JA4339). 

Foote, C.S., Ching, T., Geller, G.G. 1974. Chemistry of singlet oxygen. XVIII. Rates of reaction and quenching of a-tocopherol and singlet oxygen. Photochem. Photohiol. 20, 511-513. 

For the singlet-oxygen photochemical reaction or for the complete reaction mixture when illumination conditions and O2 pressures cause the singlet-oxygen mediated reaction to dominate, alkane oxidation continues for more than 6 h as shown in Figure 2. 

Devasagayam, T.P.A., Werner, T., Ippendorf, H., Martin, H.D. and Sies, H. 1992. Synthetic carotenoids, novel polyene polyketones and new capsorubin isomers as efficient quenchers of singlet molecular oxygen. Photochem. Photobiol. 55 511-514. 

I.B.C. Matheson, J. Lee (1979). Chemical reaction rates of amino acids with singlet oxygen. Photochem. Photobiol, 29, 875-878. 

The temperature obtained here is for the tangential height of 21 km and agrees with that of the U.S. Standard Atmospheric Supplements, 1966, as compiled in the "Handbook of Geophysics and Space Environments". This means, that this altitude, the 02( g) molecules are in thermal equilibrium with ground state N2 molecules the collisional deactivation is faster than activation of oxygen photochemical processes (12). Thus, we were able to confirm that the present spectrometer measures the effective spectrum necessary to determine rotational temperatures with a satisfactory accuracy. The rotational temperatures of the O2 ( F ) molecule, at other altitudes were similarly obtained, the final report will be presented elsewhere (13). 

Explain the following concepts and keywords photooxygenation stratospheric ozone depletion singlet oxygen photochemical smog photosensitivity phototoxicity photoallergy photodynamic therapy photoinhibition chemiluminescence perepoxide. 

Photo-oxidative reactions may occur in many solvents in the presence of oxygen Photochemical reactions of several common solvents are presented below ... 

Oxidative cleavage of the indole 2,3-double bond has been achieved with ozone, sodium periodate, potassium superoxide, with oxygen in the presence of cuprous chloride, and with oxygen photochemically in ethanolic solution irradiation in an organic acid as solvent leads to oxidation at 2- and 3-alkyl groups. ... 

Larson, R. A. and L. L. Hunt. 1978. Photooxidation of a refined petroleum oil inhibition by 8-carotene and role of singlet oxygen. Photochem. Photobiol. 28, 553-555. 

Doleiden, F.H., Fahrenholtz, S.R., Lamola, A.A. and Trozzolo, A.M. Reactivity of cholesterol and some fatty acids toward singlet oxygen. Photochem. Photobiol. 20, 519-521 (1974). 

Oxygen.— Photochemically induced insertion of molecular oxygen into the Co—C (T-bond of optically active 2-butylpyridine cobal oxime occurs with complete race-mization and the loss of optical activity can be attributed to a free-radical mechanism for which evidence has been obtained. Re-investigation of the corresponding reaction of O2 with 2-hydroxy-1-phenethylpyridine cobaloxime, which was originally reported to yield an optically active insertion product, also resulted in isolation of a racemic complex and the mechanistic details of these reactions at present remain obscure. 

Petterson RC, Kalbag SM, Irving CS (1970) A solid state single oxygen photochemical generator. Ann N Y Acad Sci 171 133-134... 

Neely WC, Martin JM, Barker SA (1988) Products and relative reaction rates of the oxidation of tocopherols with singlet molecular oxygen. Photochem Photobiol 48 423-428... 

Another singlet oxygen photochemical oxygenation of a-terpinene was performed in a microstructured reactor [136]. A solid supported [60] fiillerene photosensitizer that was grafted to Tentage beads was used as singlet oxygen sensitizer. Oxidation of a-terpinene was achieved within 50 s. 

Milller-Breitkreutz, K., Mohr, H., Briviba, K., and Sies, H., Inactivation of viruses by chemically and photochemically generated singlet oxygen,/. Photochem. Photohiol B Biol, 30, 63,1995. 

Tratnyek, P. G. and Hoigne, J., Photo-oxidation of 2,4,6-trimethylphenol in aqueous laboratory solutions and natural waters kinetics of reaction with singlet oxygen, /. Photochem. Photobiol. A, 84, 153, 1994. 

Richard, C. and Boule, R, Is the oxidation of salicylic add to 2,5-dihydroxybenzoic acid a spedfic reaction of singlet oxygen , /. Photochem. Photobiol. A Chem., 84, 151,1994. 

Freyer, W. and Leupold, D., A multichromophoric tetraanthraporphyrazine based on involvement of molecular singlet oxygen,/. Photochem. PhotobioL, A Chem., 105,153, 1997. 

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