# Mozingo reduction mechanism

I have been searching for the mechanism of the Mozingo reduction on Google but I haven't found anything relevant.

Is the mechanism known? If so, what is it; if not, what hypothetical mechanisms can we consider?

In a second step, the thioketal is subsequently reduced to the corresponding methylene compound. The reduction can be a standard Raney nickel hydrogenolysis or hydrazine can be used at higher temperatures. The mechanism of reactions on metal surfaces or at higher temperatures are usually not well understood. Note however that a typical $\ce{C-S}$ bond is around 20 kcal/m weaker than a $\ce{C-C}$ bond. It is also known that sulfur is readily bound at metal surfaces (catalyst poisoning by sulfur being an example). The complexation of sulfur and the metal likely weakens the $\ce{C-S}$ bond further. Whether a $\ce{C-S.}$ radical is formed that reacts with a hydrogen radical complexed at the metal surface, or whether the hydride anion is generated at the metal surface and displaces the sulfur at the weakened $\ce{C-S}$ bond is not known.