Synthesis, structure, and electrochemical properties of biferrocenes annulated with 1,2-dithiin and 1,2-dithiin 1,1-dioxides

Three new biferrocenes annulated with 1,2-dithiin (1) and 1,2-dithiin 1,1-dioxides (2) and (3) were successfully synthesized satisfactory yields by the reaction of 2,2″-bis(N,N-dimethylaminosulfonyl)-1,1″-biferrocene with lithium aluminum hydride followed by treatment with chlorotrimethylsilane. The electrochemical properties of the biferrocenes (1)-(3) were furnished by cyclic and differential pulse voltammetries.