Spectroscopic study of phenyl- and 4-pyridylmalondialdehydes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F01%3A00004827" target="_blank" >RIV/60461373:22340/01:00004827 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Spectroscopic study of phenyl- and 4-pyridylmalondialdehydes
Original language description
4-pyridylmalondialdehyde (1) and phenylmalondialdehyde (2) and their potassium salts were investigated by 1H and 13C NMR, Raman and UV spectroscopy. Three forms of 1 and two forms of 2 were found in water or DMSO solution depending on the pH by means ofUV, 1H and 13C NMR spectroscopy. For 2 the chemical exchange between two cis-enol tautomers was observed, while the structure of 1 in the solution is zwitterionic. From the UV measurements and potentiometric titrations pK1=1.9 # 0.1, pK2=7.2 # 0,1 for 1and pK=4.0 # 0.2 for 2 were evaluated. For 1 the Raman spectra of solid state and DMSO solution are very similar, while for 2 they differ significantly. Butylamine was used as a model compound for the study of the potential interaction of malondialdehy dewith compounds containing amino groups. The effect of addition of butylamine on the spectra of both malondialdehyde derivatives were indistinguishable from that corresponding to protonation-deprotonation processes.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CB - Analytical chemistry, separation
OECD FORD branch
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Publication year
2001
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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