S4NR (R=Methyl,n-Octyl) as Novel Chelating Ligands in Titanocene Complexes and First Synthesis of Small Sulfurimide Heterocycles SnNR (n=5, 6)

Not the expected insertion into a S−S bond but rather substitution of one NR unit takes place in the reaction of [Cp₂Ti(CO)₂] with cyclic tetrasulfurdiimides 1,4-S₄(NR)₂. The product obtained contains the novel ligand S₄NR and serves as precursor in the synthesis of small SN heterocycles not accessible before (see below).