Oxygen partial reduction products

Oxygen is a gas. Colourless and odourless, without it we suffocate. Yet when its partial reduction products, hydroxyl radicals and peroxy radicals, overwhelm our body s defence systems, oxygen ultimately kills us. It is these partial reduction products that are the most likely cause of ageing. 

Coping xvith partial reduction products of oxygen... 

There is now evidence that the toxicity of oxygen, as expressed by its partial reduction products, may be used in the overall defensive strategy of... 

Photochemical transformations were carried out to determine whether the 4-amino-pyrimidine wave I reduction product is susceptible to photochemical oxidation, as in the case of other pyrimidine derivatives 2> 3,5 96). The resulting data are summarized in Table III. Irradiation at 300 nm or 254 nm of a freshly electrolyzed solution subsequently brought to pH 0.5, in the presence of mercury, did in fact lead to partial (about 50 %) regeneration of 4-aminopyrimidine. Such partial regeneration, however, also occurred spontaneously in the presence, but not in the absence, of air (oxygen). The fact that this reaction occurred only in the presence of mercury is rather puzzling, but points to involvement of some adsorption process(es). 

These are called acetogenins (or sometimes polyketides). Many of these compounds are aromatic, and their pathway of formation is the principal means of synthesis of the benzene ring in nature. Not all are lipids, because partial reduction often leaves oxygen-containing groups, which render the product soluble in water. 

Iron vanadate, FeV04, is a prospective material for lithium rechargeable batteries and in catalysis. In [90] mechanical coactivation of iron and vanadium oxides was used to prepare intimate nanoscale mixture, similar to those prepared by soft chemistry. Reduction of this mixture at the same temperature and oxygen partial pressure conditions as of soft chemistry products (500°C and 10 Pa) leads to formation of a nanometric vanadium ferrite with the only spinel phase. The characterization of the powders thus prepared was perfomed by X-ray diffraction, SEM, IR spectrometry, thermogravimetry and colourimetry. It was shown that the homogeneity of grain size and chemical composition is achieved if the initial oxides have similar grain size. 

---