Catalysis by α-cyclodextrin of the reaction of formic acid with bromine
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α-Cyclodextrin (CD) modestly increases the rate of oxidation of formic acid by bromine. The variation of rate constants with [Br−] is consistent with dominance of the formation of a CD•Br3− complex in determining the fraction of free Br2 and the CD•Br2 complex, under the reaction conditions. Potentiometric measurements support a dissociation constant of about 0.2 mM for the CD•Br3− complex, in agreement with an earlier spectrophotometric value. Analysis of the rate increases with [CD] implies that CD•Br2 is more reactive (~10 times) than free Br2 towards formate ion, as was found for phenols. These conclusions differ from those of another recent study. Keywords: catalysis, α-cyclodextrin, oxidation, formic acid, bromine.
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1958 ◽
Vol 245
(1240)
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pp. 40-48
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1962 ◽
Vol 58
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pp. 1409
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1970 ◽
Vol 55
(3)
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pp. 309-335
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2014 ◽
Vol 20
(26)
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pp. 7878-7883
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