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The basicities and nucleophilicities along with prototautomerism of biologically active oxazolidin-4-one and its thio and azo analogs were investigated by semi-empirical methods. The oxo and thion protonation were found to be easier than that of azo protonation for 4-oxo and 4-thion derivatives whereas amino protonation was found to be easier than imino and azo protonation in 4-imino derivative. The...
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