Methods of Creating closo-Decaborate Anion Derivatives with Bridging and Terminal Exopolyhedral Cyclic Substituents of Sulfonium Type

Abstract

New methods of creation of cyclic bridging and terminal exopolyhedral sulfur-containing substituents in the closo-decaborate anion have been suggested. It has been shown that the reaction of [B₁₀H₉SH]^2– with 1,2-dibromoethane leads to crosslinking of two cluster anions to give the [B₁₀H₉S(CH₂)₄SB₁₀H₉]^2– dimer. An analogous reaction with 1,4-dibromobutane yields a derivative with the cyclic tetrahydrothiophene substituent [B₁₀H₉S(CH₂)₄]^–. Its interaction with tetrahydrothiophene in the presence of a small excess of trifluoroacetic acid leads to the formation of the neutral disubstituted derivative [B₁₀H₈(S(CH₂)₄)₂].