Redox and non-redox reactivity of dihydrogen sulfide at a triply bonded dimetal core: hydrido, hydrosulfido and gem-dithiolato complexes of dirhenium
Abstract
While H2S oxidatively adds to the electron-rich Re–Re triple bond of Re2X4(µ-dppm)2(X = Cl or Br; dppm = Ph2PCH2PPh2) to give Re2(µ-H)(µ-SH)X4(µ-dppm)2, non-redox reactions occur upon reaction of H2S with cis-Re2(µ-O2CR)2Cl2(µ-dppm)2(R = Me or Et) in the presence of HBF4·Et2O to give either cis-Re2(µ-SH)2Cl2(µ-dppm)2, when thf (tetrahydrofuran) or CHCl3 is used as the solvent, or the gem-dithiolato complexes cis-Re2(µS2CR′R″)2Cl2(µ-dppm)2 and cis-Re2(µ-S2CHR″)2Cl2(µ-dppm)2 in the presence of ketones (R′R″CO) and aldehydes (R″CHO).