Guess the Mechanism help (Organic Chemistry)

[Gigantron]

"Guess the Mechanism" help! (Organic Chemistry)

Homework Statement

After identifying my reactants and products via spectral analysis, I am now tasked with figuring out the mechanism behind converting a diol into a ketone.

Homework Equations

The Attempt at a Solution

The key to this appears to be tautomerization somewhere in the reactant (whereby the oxygen atoms donate electrons in order to create a double bond), but everything I've tried with that has failed so far. I'm really stuck.

 

[Gigantron]

So I was able to figure it out myself. Apparently, this is a pinacol rearrangement (http://en.wikipedia.org/wiki/Pinacol_rearrangement), which would explain many things...namely that we never even covered it in lecture at this point. >.>