Oxygen Activation by

A. E. Martell and D. T. Sawyer (eds.). Oxygen Complexes and Oxygen Activation by Transition Metals, Plenum, New York, 1988, 341 pp. 

Oxidation is initiated by formation of radicals which may be the result of enzyme catalysed reactions like oxygen activation by xanthine oxidase in... 

Chen, P. and Solomon, E.I. (2004). Oxygen activation by the noncoupled binuclear copper site in peptidylglycine-a-hydroxylating monoxygenase. Reaction mechanism and role of the noncoupled nature of the active site. J. Am. Chem. Soc. 126, 4991-5000... 

Hawkes, B. K. and Dawson, J. H. (1992) Oxygen activation by mono-oxygenase. Active site structure and mechanisms of action. Frontiers in Biotransformation 7, 216-278. 

D. Oxygen Activation by Binuclear Octahedral Iron Centers.249... 

Fig. 7. Model for oxygen activation by intradiol dioxygenases. PCA, the substrate pro-tochatechuic acid.

As an appropriate concluding section in this wide-ranging review of oxygen activation by cobalt-, rhodium-, and iridium-containing systems, it has been reported (233) that molten sodium meta-phosphate (NaP03), at 850°C, reacts with dioxygen to produce the superoxide... 

Also Other mechanisms of oxygen activation by flavohydroquinone have been postulated, among others the formation of oxaziridines, dioxetanes and carbonyl oxides but the resulting chromophores would probably absorb at wavelengths shorter than 370 nm. However, Bruice and his co-workers gathered... 

Makris TM, Davydov R, Denisov IG, et al. Mechanistic enzymology of oxygen activation by the cytochromes p450. Drug Metab Rev 2002 34 691-708. 

There are no new principles involved as far as an electrolytic sensor is concerned. The electrolyte membrane is /i-alumina and the reference sodium activity fixed, at constant oxygen activity, by a mixture of sodium ferrite (Na10Fe16O29, which can be written 5Na20 8Fe203) and Fe203, just as it is common practice to fix oxygen activity by a mixture of a metal and its oxide. 

An interesting example of oxygen activation by onium salts of nontransition elements has been claimed. Sulfonium salts were found to be especially effective,211 and it was proposed212-214b that dioxygen complexes of sulfonium compounds can initiate autoxidations via hydrogen transfer with hydrocarbons, e.g.,... 

Both of the oxygen atoms incorporated into catechol have been shown639 by labeling studies to be derived from molecular oxygen. Pyrocatechase and other related oxygenases are known to require either copper or iron for maximum activity. An efficient, nonenzymatic oxidation of catechol to s,os-muconate with molecular oxygen activated by cuprous chloride has been recently presented as a model reaction for pyrocatechase.649... 

Metelitsa et al.6S3 recently reported the hydroxylation of naphthalene to a-naphthol with Mo(CO)6-02 at 75° to 95°C in acetonitrile solutions. Oxygen activation by the (Ci0H8)Mo(CO)3 complex was suggested ... 

Bruice, T. Carbon Acid Oxidations and Oxygen Activation by Flavins ... 

Continuing our current studies on porphyrin Mn complexes (31, 32, 33), some Mn(II) complexes have been found to activate the oxygen molecule very efficiently under certain conditions, and this chapter reports the oxidation of olefins using molecular oxygen activated by a tetraphenylporphyrin-Mn(II) complex. 

Bollinger JM, Krebs C. Stalking intermediates in oxygen activation by iron enzymes Motivation and method. J Inorg Biochem. 2006 100 586-605. 

Swaisgood, H.E., Abraham, P. 1980. Oxygen activation by sulfhydryl oxidase and the enzyme s interaction with peroxidase. J. Dairy Sci. 63, 1205-1210. 

Flavin-dependent le -transfer in enzymes and chemical model systems can he differentiated from 2e -transfer activities, i.e., (de)hydrogenation and oxygen activation, by chemical structure and dynamics. For le -transfer, two types of contacts are discussed, namely outer sphere for interflavin and flavin-heme and inner sphere for flavinr-fenedoxin contacts. Flavin is the indispensable mediator between 2e - and le -transfer in all biological redox chains, and there is a minimal requirement of three cooperating redox-active sites for this activity. The switch between 2e - and le -transfer is caused by apoprotein-dependent prototropy between flavin positions N(l)/0(2a) and N(5) or by N(5)-metal contact. 

Yeom, H. Y., and Sligar, S. G. 1997 Oxygen activation by cytochrome P450(BM-3) Effects of mutating an active site acidic residue. Arch. Biochem. Biophys., 337, 209-216. 

---