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Trace metal ion catalysis; kinetics and mechanism of oxidation of metol by hydrogen peroxide in the presence of iron(III) sulphate in acid perchlorate

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Summary

The kinetics of oxidation of N-methyl-p-aminophenol (metol) by H2O2 in the presence of trace levels of FeIII have been studied in an HClO4 medium. The reaction mechanism is complex and the catalytic role of FeIII in the sulphato form is indicated. The following rate law accounts for the experimental observations:

$$ - d[H_2 O_2 ]/dt =$$
$$k_{un}^i + \frac{{K_1 K_2 [metol][H_2 O_2 ][Fe^{3 + } ](k_1 + k_2 [metol])}}{{1 + K_1 [metol] + K_1 K_2 [metol][H_2 O_2 ]}}$$

where k un i is the initial rate for the uncatalysed reaction.

The equilibrium constants K 1 and K 2 are the formation constants for the complexes [Fe(metol)]3+ and [Fe-(metol)(H2O2)]3+, respectively. The catalytic role of FeIII is explained by considering a ternary complex in the transition state.

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Authors and Affiliations

  1. Department of Chemistry, University of Rajasthan, 302 004, Jaipur, India

    S. Nahar, C. M. Gangwal, I. Sharma & P. D. Sharma

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  1. S. Nahar
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  2. C. M. Gangwal
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  3. I. Sharma
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  4. P. D. Sharma
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Nahar, S., Gangwal, C.M., Sharma, I. et al. Trace metal ion catalysis; kinetics and mechanism of oxidation of metol by hydrogen peroxide in the presence of iron(III) sulphate in acid perchlorate. Transition Met Chem 20, 111–114 (1995). https://doi.org/10.1007/BF00167007

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  • DOI: https://doi.org/10.1007/BF00167007

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