I recently heard a talk from a physicist about experiments on simple two-atom molecules in vacuum that showed that certain behaviour of the molecules was explained by quantum entanglement. Now this experiment was about creating holes in the inner electron shells of the molecule, so pretty much in the realm of physics and not chemistry. It was also performed in vacuum, and the lecturer himself said that in solution such an effect would likely be destroyed by frequent collisions in the solvent.
I was wondering if there are any examples of chemical behaviour of molecules that can only be explained by quantum entanglement. Does it ever play a role on the scale of chemistry, or is this effect just not relevant on anything beyond the small moleculs in vacuum stage physicists tend to use?