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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

12 Issues per year


IMPACT FACTOR 2016: 0.631

SCImago Journal Rank (SJR) 2016: 0.237
Source Normalized Impact per Paper (SNIP) 2016: 0.332

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1865-7117
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Volume 46, Issue 10 (Oct 1991)

Issues

Chiral Intermediates and the Oscillatory Effect of Circular Dichroism in the Belousov – Zhabotinskii Type Reaction of L-Ascorbic Acid

Thomas Buhse / Wolfram Thiemann
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-1991-1019

Investigating the Belousov—Zhabotinskii (BZ) type reaction of an acidic L-ascorbic acid (AA) / potassium bromate / cerous sulfate system, an oscillatory effect of circular dichroism is detectable at λ = 300 nm. HPLC analysis of the oscillatory mixture and spectroscopic experiments indicate that this effect is caused by 3,4,5-trihydroxy-2-oxo-L-valeraldehyde (TVA) — a C 5 oxidation fragment of AA. Because of the bromide ion production occurring before the metal catalyst addition the AA system shows no preoscillatory phase and a rather short entire length of oscillation up to a maximum of 20 min. Since AA is not brominated but oxidized by bromine which is formed by the Landolt typ “clock reaction” of AA with acidic bromate, partially bromine-hydrolysis-controlled (BHC) oscillations are discussed for the overall mechanism of this BZ system.

About the article

Received: 1991-03-01

Published Online: 2014-06-02

Published in Print: 1991-10-01


Citation Information: Zeitschrift für Naturforschung B, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-1991-1019.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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