Abstract
A reagent- and waste-free method for the transformation of hydrogen sulfide and thiols with С3-С8 hydrocarbons groups into value-added di- and trisulfides is proposed under the microwave irradiation. The hydrogen sulfide solution in N-methylpyrrolidone was used as the reaction medium to occur the interaction with different thiols. The influence of the microwave irradiation power, duration, the temperature and thiol structure on the yield and ratio of target products has been investigated. It is found that the effective microwave power for activation of H2S and RSH should be at least 200 W, while increasing the reaction temperature reduces the contact time. The maximum values for the yield of di- and trisulfides were obtained at 280 W and 100 °C. High selectivity of trisulfide formation was observed in the case of alkanethiols C3-C5, especially for compounds with isomeric hydrocarbons groups. Differences in the mechanisms of H2S interaction with linear and branched thiols based on the formation of alkylhydropolysulfide intermediates have been identified. The proposed scheme of utilization of H2S and low-molecular-weight thiols into organic polysulfides under microwave irradiation was suggested.
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