Radical cation of hydrogen sulfide and reactions of cyclization of 1,5-diketones with its participation

Radical cation of hydrogen sulfide is generated electrochemically by gamma- irradiating a Freon matrix, under the action of single-electron oxidants (s terically hindered a-benzoquinones). It is shown that the radical cation ex hibits properties of a superacid. The possibility of obtaining thiopyrans a nd salts of thiopyrilium from substituted 1,5-diketones during an anodic ox idation of molecular hydrogen sulfide to radical cation in acetonitrile is studied.