"Guess the Mechanism" help! (Organic Chemistry) 1. The problem statement, all variables and given/known data 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. 2. Relevant equations 3. 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.