Involving of hydrogen sulphide radical-cation in reaction with pentamerous heterocycles
Anodic initiated introduction of sulfur and thiylic substituents in pentamerous heterocycles such as furan, thiophene and pyrrole was considered in present study. That method allows to activate H<sub>2</sub>S at room temperature up to radical-cation and to transform furan and pyrrole into thiophene and 2-thiophenethiol. 2,5-thiophenedithiol, bis(2-thienyl)sulphide, bis(2-thienyl)disulphide were obtained from thiophene at a variation of electrochemical synthesis conditions. The application of easily recovering spatially- hindered o-benzoquinones for H<sub>2</sub>S oxidizing activation was considered.