| | 1 | Author
| Thomas Buhse, Wolfram Thiemann | Requires cookie* | | | Title
| Chiral Intermediates and the Oscillatory Effect of Circular Dichroism in the Belousov -Zhabotinskii Type Reaction of L-Ascorbic Acid  | | | | Abstract
| Investigating the Belousov-Z habotinskii (BZ) type reaction of an acidic L-ascorbic acid (AA) / potassium brom ate / cerous sulfate system, an oscillatory effect of circular dichroism is detectable at A = 300 nm. HPLC analysis o f the oscillatory mixture and spectroscopic experi ments indicate that this effect is caused by 3,4,5-trihydroxy-2-oxo-L-valeraldehyde (TVA) -a C5 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 brom inated but oxidized by bromine which is formed by the Landolt typ "clock reaction" o f AA with acidic brom ate, par tially bromine-hydrolysis-controlled (BHC) oscillations are discussed for the overall mecha nism of this BZ system. | | | |
Reference
| Z. Naturforsch. 46b, 1406—1414 (1991); received | | | |
Published
| 1991 | | | |
Keywords
| M arch 1, 1991 Chemical Oscillations, CD Spectra, L-Ascorbic Acid, B elousov-Z habotinskii Reaction, Bromate | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1406.pdf | | | | Identifier
| ZNB-1991-46b-1406 | | | | Volume
| 46 | |
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