Abstract
The degradation of RH1 in aqueous solution is found to be both acid and base catalyzed. The maximum stability is obtained in neutral pH but still degrades by 10% (t90) after just 1 week. The stability profile at pH 5 was done, and 4 major degradation products were observed in acid solutions. LC-MS was performed and the molecular weights determined, from which a degradation mechanism was proposed. Degradation products I, II, and III form 2 isomers each depending on which aziridine group is hydrolyzed. No significant effect of light or the presence of antioxidants was observed, indicating that photodegradation and oxidation are not likely degradation reactions.
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