Multiple C-H Bond Activations and Ring-Opening C-S Bond Cleavage of Thiophene by Dirhenium Carbonyl Complexes.

The reaction of Re(CO)(μ-CH)(μ-H) (1) with thiophene in CHCl at 40 °C yielded the new compound Re(CO)(μ-η-SCH)(μ-H) (2), which contains a bridging σ-π-coordinated thienyl ligand formed by the activation of the C-H bond at the 2 position of the thiophene. Compound 2 exhibits dynamical activity on the NMR time scale involving rearrangements of the bridging thienyl ligand. The reaction of compound 2 with a second 1 equiv of 1 at 45 °C yielded the doubly metalated product [Re(CO)(μ-H)](μ-η-2,3-μ-η-4,5-CHS) (3), formed by the activation of the C-H bond at the 5 position of the thienyl ligand in 2. Heating 3 in a hexane solvent to reflux transformed it into the ring-opened compound Re(CO)[μ-η-η-SCC(H)C(H)C(H)][Re(CO)][Re(CO)(μ-H)] (4) by the loss of one CO ligand. Compound 4 contains a doubly metalated 1-thiapentadienyl ligand formed by the cleavage of one of the C-S bonds. When heated to reflux (125 °C) in an octane solvent in the presence of HO, the new compound Re(CO)[η-μ-η-SC(H)C(H)C(H)C(H)]Re(CO) (5) was obtained by cleavage of the Re(CO)(μ-H) group from 4 with formation of the known coproduct [Re(CO)(μ-OH)]. All new products were characterized by single-crystal X-ray diffraction analyses.