disproportionation


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Related to disproportionation: Disproportionation reaction

disproportionation

[‚dis·prə‚pȯr·shə′nā·shən]
(chemistry)
The changing of a substance, usually by simultaneous oxidation and reduction, into two or more dissimilar substances.
References in periodicals archive ?
However, peroxide vulcanization of rubber initiated by peroxide decomposition accompanies side reactions such as chain scission and disproportionation, which induce rapid consumption of peroxide without formation of radicals, lowering crosslinking efficiency [25, 29].
The conversion of toluene increased with decreasing the amount of toluene in the feed, from toluene: methanol molar ratio of 8:1 to 1:2, and benzene (from disproportionation of toluene and/or toluene dealkylation) decreased from 7.
65) Disruption of the acid disproportionation of nitrite to nitric oxide through PPI use may also affect the NO biology of bone metabolism.
All the measurements were carried out at pH = 12, lower values were avoided to avoid the possible disproportionation reaction of Mn(V) and Mn(VI) [5,9] and higher pH was avoided to slowdown the reaction rate.
2 shows the more common disproportionation reaction leading to [S.
In this method, single wall carbon nanotubes are grown by CO disproportionation (decomposition into C and carbon dioxide) at 700-950 in flow of pure CO at a total pressure that typically ranges from 1 to 10 atm.
ktd is rate constant for termination by disproportionation
2] (via disproportionation from superoxide, or from the enzyme superoxide dismutase that converts superoxide into hydrogen peroxide plus oxygen), which in high enough concentrations is toxic to cells.
This has provided direct crystallographic evidence for charge order below the Verwey transition, although the magnitude of the estimated charge disproportionation is only 20% of that expected for ideal [Fe.
Disproportionation, in which two identical radicals react with each other, with one of the radicals donating an electron to the other so that two different molecules are formed, each of which is stable.
2] can be present and can undergo disproportionation and self decompose to form NO and N[O.
In this kind of polymerization, the presence of chain breaking events, such as radical coupling and disproportionation, renders the control of the molecular weight and its distribution (MWD), and in the case of multipolymerization, the fine control of microstructure, very difficult.