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 ?
From the intercepts of the linear plots of 1/[k.sub.obs] against 1/[S] (figure 5) the rate constants for the disproportionation of the complex, [k.sub.s], were obtained and recorded in table 3 for each sugar.
It was shown to catalyze the disproportionation (dismutation) reaction between superoxide ions, free radicals which are more reactive than molecular oxygen.
One problem that arose during analysis was that this compound and its derivatives undergo a phenomenon that appears to be a disproportionation reaction.
With increased compatibility between PBD and EVM, the high 1,2-vinyl polybutadiene became more efficient in increasing crosslink density by suppressing unwanted chain terminating reactions such as beta scission and disproportionation.
Cardosoa, "Acidity of Beta zeolite determined by TPD of ammonia and ethylbenzene disproportionation," Applied Catalysis A: General, vol.
This might be because the disproportionation or reduction reaction of Cu(I) is occurred during the preparation process.
Often the combination or disproportionation of two active polymer chains stops the reaction.
In case of semiquinone, this will partly regenerate the initial quinol molecule via disproportionation:
These clusters in turn act as a catalyst that triggers an autocatalytical disproportionation reaction to form a gold shell around the hydrogen bubble.
This latter peak is attributed to the external vinylidene groups, which are formed by disproportionation between free radicals formed by rupture of the polymer backbone and are an index of thermal oxidation [19].
This may be due to BA terminating predominately by combination, whereas BMA terminates predominately by disproportionation. (30) There is also a slight trend of increasing molecular weight with increasing HEA content.
Filaments formation is easier through the Boudouard reaction (CO disproportionation) but other mechanisms are possible as the direct dissociation of the methane.