Oxygen anomalous behavior

Meyers212 collected together several examples of the anomalous behavior of sulfones in which the group was close to the reaction center and interpreted these in terms of the negative direct field effect of the S02 oxygen atoms (cf. Meyers and colleagues141). 

There is an interesting analogy between the anomalous behavior of Pr in boro-carbides with the well-known anomalous properties of Pr-containing cuprates (Lynn, 1997, see Section 1.3). For PrBa2Cu30 -, e.g., it is widely accepted that the absence of superconductivity and the anomalously high Tn are connected with the increased hybridization of 4f levels with planar oxygen-derived states being important for superconductivity of doped holes. 

The explanation for this anomalous behavior may be that the omission of the ether oxygen yields a closer... 

Antioxidant Activity of Some Phenyl-Substituted Phenols (VII) in PP at 180°C (Oxygen-Uptake Test). In Table I the results obtained with some phenyl-substituted phenols are shown and compared with some well-known ferf-butyl-substituted phenols. A general conclusion from this table is the marked synergism between phenyl-substituted phenols and -activated thioethers compared with the ferf-butyl-substituted analog. Since the measurements are done in a closed tube, the influence of the volatility of the thiodipropionates is not reflected in the induction periods. An explanation for the anomalous behavior of phenyl-substituted phenols in synergistic mixtures can be found in the results of the model reactions, carried out with phenoxyl radicals and sulfides or sulfoxides (see "Model Reactions ). 

The anomalous behavior of the electrode Pt(02) has been noted and explained by peroxide function of the gas oxygen electrodes (of the first type). On the contrary to gas electrodes, metal-oxide electrodes (of the second type) were reversible with the slope corresponding to the reaction ... 

In order to understand the anomalous behavior of KCl, the effect of oxygen defect states on its surface charge was studied in detail by Yalamanchili and Miller [10]. The possible types of defects that can be present in ionic crystals are many [33]. As is well known, the most common types of defects that are always present in ionic crystals are Frenkel and Schottky defects. A Frenkel defect forms when an ion... 

In sharp contrast to the behavior of 9-BBN, hydroboration of an internal allene with disiamylborane and dicyclohexylborane reveals preferential attack of the boron at the central carbon of the allenic chain, forming vinylboranes. For example, 2,4-dimethyl-2,3-pentadiene is converted [7] essentially, quantitatively, to the vinylborane with dicyclohexyl- and disiamylboranes, but exclusively to the allylborane with 9-BBN (Chart 5.24). In sharp contrast to acyclic allylborane, these allylborane products of 9-BBN do not react with acetone however, it undergoes usual alkaline hydrogen peroxide oxidation to afford the corresponding allylic alcohol. No protonolysis is observed on oxidation. This anomalous behavior of the allylborane is due to the steric bulk surrounding the boron atom, which prevents the coordination of oxygen of the acetone or water, necessary for allylboration or protonolysis [2, 8]. 

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