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Solvents inducing oxidation of hydroxylamines
Shizuyo Horiyama1, Kiyoko Suwa, Masae Yamaki
1Faculty of Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, Japan. horiyama@mwu.mukogawa-u.ac.jp
Chemical & Pharmaceutical Bulletin
|July 20, 2002
Summary
Hydroxylamines oxidize to oximes in organic solvents like methanol. This oxidation rate is influenced by the solvent type, as confirmed by NMR and LC-MS analysis.
Area of Science:
- Analytical Chemistry
- Organic Chemistry
Background:
- Hydroxylamines are susceptible to oxidation.
- This oxidation can lead to the formation of oximes.
- Understanding this transformation is crucial for chemical synthesis and analysis.
Purpose of the Study:
- To investigate the oxidation of hydroxylamines in organic solvents.
- To quantify the oxidation rate using advanced analytical techniques.
- To determine the influence of solvent type on the oxidation process.
Main Methods:
- (1)H-NMR spectroscopy was used to monitor the reaction.
- Liquid chromatography-mass spectrometry (LC-MS) with atmospheric pressure chemical ionization (APCI) was employed.
- Oxidation rates were estimated by analyzing peak areas in mass chromatograms.
Main Results:
- Hydroxylamines were observed to gradually oxidize to their corresponding oximes.
- The rate of oxidation was found to be dependent on the specific organic solvent used.
- Methanol was identified as a solvent where this oxidation readily occurs.
Conclusions:
- The solvent plays a significant role in the oxidation rate of hydroxylamines.
- LC-APCİ-MS is a suitable method for monitoring and quantifying this oxidation.
- Further studies may explore a wider range of solvents and hydroxylamine derivatives.