Double bridging sulfido ligands

The deprotonation reaction of Cp2Ti(SH)2 with NaH in THF proceeds unexpectedly with the elimination of GpH to give the anionic sulfide-bridged titanium(iv) dimer, Na2[CpTi(/x-S)(S)]2. The molecular structure of this compound has been determined by X-ray diffraction and shows a terminal sulfido ligand with a short Ti-S bond distance of ca. 2.2 A, indicating nearly double bond character (Scheme 417). It adopts a yy/z-Ti=S configuration and is stabilized by interactions with THF-solvated sodium cations.1009... 

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