Tetrylenes based on polydentate sulfur-containing ligands

Polydentate SNO-coordinating proligands were obtained by addition of thioacetic acid to conjugated alkene, or ring-opening of thiiranes with organolithium compounds as the key stages. These SNO- and known SNS- and SOS- coordinating proligands were used for the synthesis of tetrylenes by the reaction with Lappert’s tetrylenes E[N(SiMe₃)₂]₂ (E = Ge, Sn), giving polymeric, monomeric or dimeric species depending on the type of the ligand. The structure of stannylenes in solution was analysed by ¹¹⁹Sn NMR spectroscopy.