Cyclopentadienylaluminum thiolates - synthesis and structure

The dicyclopentadienylaluminum thiolates Cp₂Al(μ-SR)]₂, where R = Et (1), ⁱPr (2), were obtained by reacting Cl₂AlSR with CpNa at the molar ratio 1:2, respectively. Use of CpLi instead of CpNa at the same molar ratio of reagents leads to the formation of cyclopentadienyl(chloro)aluminum thiolates Cp(Cl)Al(μ-SR)]₂, exclusively, where R = Et (3), ⁱPr (4), ⁱBu (5), and ⁿBu (6). The compounds were characterized by ¹H, ¹³C, and ²⁷Al NMR spectroscopy. The structures of the compounds 1 and 4 were determined by X-ray crystallography.