2026 Chemistry Nobel: The Science of Molecular Handedness

Gist The 2026 Nobel Prize in Chemistry has been awarded to Henri Kagan and Kenso Soai for their pioneering work in amplifying the "handedness" chirality of chemical molecules. Their discoveries overturned long-held chemical dogmas to prove that a molecule can catalyse its own production while simultaneously exponentially increasing its purity. For UPSC aspirants, this is significant for its revolutionary applications in manufacturing safer, high-purity pharmaceuticals and for providing a definitive proof-of-concept for how life on Earth may have evolved its unique biological preference for specific molecular structures. Background Chirality refers to the geometric property where a molecule cannot be superimposed on its mirror image, functioning much like the structural difference between a human's left and right hands. These non-superimposable mirror-image molecules are called enantiomers, and standard laboratory reactions typically produce a 50:50 mixture of both, known scientifically as a racemate. Living organisms exhibit homochirality, meaning they overwhelmingly favour one specific enantiomer over the other; for example, every amino acid in protein uses the "left" L form, while every sugar in DNA uses the "right" D form. Before the work of…