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Qualitative and quantitative NMR experiments were performed on 5M aqueous solutions of monoethanolamine (MEA) loaded with CO2 (alpha = 0.4) and in presence of 1mM FeSO4 x 7H2O as a catalyst. The main degradation products were identified and quantified by 1D and 2D NMR Spectroscopy as: N-(2-hydroxyethyl) imidazole (HEI), 2-oxazolidone (OZD), N-(2-hydroxyethyl) formamide (HEF). There are also some other signals not quantified yet because of the low intensity. The NMR results were compared with GC/LC-MS results of the same solution.
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Reference：
Oxazolidine – Wikipedia,
Oxazolidine | C3H445NO – PubChem