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A optimized synthesis of N-alkyl, N,N-dialkyl- and N-cycloalkyl-O-isobutyl  thioncarbamates by aminolysis of sodium isobutylxanthogenic acid (NaiBXAc)  and primary, secondary and cycloalkyl amines was developed at laboratory  scale and applied at semi-industrial level. Studies on dependence of  N-n-propyl-O-isopropylthiocarbamate yield and purity with respect to reaction  parameters: reaction time and molar ratio of n-propylamine and NaiBXAc, were  performed. In such way, optimal reaction conditions for synthesis of N-alkyl,  N,N-dialkyl- and N-cycloalkyl-O-isobutyl thioncarbamates, by aminolysis of  NaiBXAc, were established. Also, comparative results of thioncarbamates  synthesis starting from potassium isobutyl xanthate (KiBX) and corresponding  amines in presence of different oxidants: hydrogen peroxide, sodium  hypochlorite and new oxidative agent potassium peroxodisulfate were  evaluated. Synthesized compounds have been fully characterized by FTIR, 1H  and 13C NMR and MS data, elemental analysis and purity have been determined  by gas chromatographic method (GC). According to our knowledge, ten  synthesized thioncarbamates are for the first time characterized. Synthesized  compounds could be used as selective reagents for flotation of copper and  zinc ores. The presented methods offer several benefits, namely, high product  yields and purity, simple operation, mild reaction conditions without use of  hazardous organic solvents, while some of them could be implemented on  industrial scale production

Comparative analysis of oxidative synthesis of N-alkyl, N,N-dialkyl and N-cykloalkyl-O-isobutyl thioncarbamate