Sun.
Interestingly, fluorous phase is actually a lot LESS dangerous than it sounds! It involves using perfluorinated solvents, which are actually very unreactive, and behave as a separate liquid phase to their hydrogen-organic equivalent; so you could have a catalyst with a perfluorinated tag in the fluorous phase, and your reactants in an organic phase. You can mix them together to make them react, but then the two phases separate once mixing stops, allowing very efficient separation of catalyst from your final product!
Why am I a chemistry nerd?