Aspirin Trick

Added: 2026-05-28

[00:00:00]Aspirin's trick. One tiny acetyl group, just two carbons and three hydrogens, turns a stomach-shredding acid into the world's most popular painkiller.

[00:00:11]Willow bark tea contains salicylic acid, C6H4OHCOOH.

[00:00:19]It kills pain, but tears up the stomach lining because the free phenol group is too reactive.

[00:00:25]In 1897, Felix Hoffmann at Bayer added an acetyl group to that phenol, creating acetylsalicylic acid, better known as aspirin.

[00:00:35]The ester bond shields the stomach until the drug reaches the bloodstream.

[00:00:40]Once absorbed, aspirin donates its acetyl group to the enzyme cyclooxygenase, COX, permanently blocking it.

[00:00:50]No COX activity means no prostaglandins, no pain signal, no inflammation.

[00:00:58]Swapping one hydrogen for an acetyl group turned a folk remedy into a billion-dollar drug.

[00:01:05]Functional groups matter.