I am trying to figure out which tautomer of creatinine:
is more stable.
We see that the enol tautomer is more highly conjugated: the $\pi$ electrons from the alcohol to the double bond to the $\pi$ electrons of the Nitrogen to the imine to the final $\pi$ electrons of the amine.
In the keto form, we have the $\pi$ electrons from the carbonyl to the imine to the two amines.
I know the enol form is more conjugated, but in general I also know that the keto form is more stable. How do I reconcile this?