Chemistry
The Mechanism of Copper-Catalyzed Azide–Alkyne Cycloaddition (CuAAC)
Quick fact
Copper catalysis transforms a reaction that normally requires high heat and produces a 1:1 mixture of two isomers into a room-temperature process that yields a single 1,4-substituted triazole in near-quantitative amounts. This selectivity and simplicity are the hallmarks of the 'click' philosophy.
Why this is interesting
Imagine superglue for molecules—a reaction so reliable that it snaps two pieces together nearly every time, no matter what else is around. That's the promise of click chemistry, and the copper-catalyzed azide–alkyne cycloaddition is its star performer. Why does a simple copper catalyst turn a sluggish reaction into a lightning-fast, selective bond-forming event?