Henri B. Kagan of Université Paris-Sud in France and Kenso Soai of Tokyo University of Science in Japan have been awarded the 2026 Nobel Prize in chemistry for their work on chiral molecules, or “mirror image” molecules that exist in pairs with distinct properties.
Chirality is a phenomenon in which certain molecules exist as non-superimposable mirror images of each other, derived from the Greek word for hand. Amino acids, which form the basis of proteins, are among these chiral molecules, and living organisms contain only one version of each chiral pair. More than half of clinically employed drugs are chiral in nature, making the study of this molecular phenomenon critical to pharmacology.
Before their breakthrough, chemists faced significant challenges in drug synthesis. When developing new medications, scientists often produced both versions of a chiral molecule, with the unintended mirror variant potentially causing serious side effects or behaving completely differently from the intended drug. Most medications were consequently sold as racemates, containing equal mixtures of both molecular variants, as no reliable method existed to produce only one version.
Kagan’s work in 1986 demonstrated how to manipulate chemical reactions to favor the production of one mirror image over the other. Seventeen years later, Soai developed an experimental method that created only a single variant of a chiral molecule from non-chiral precursors, marking what was described as the first such achievement “since the dawn of life.” This advancement, characterized by the Nobel Committee as involving “non-linear effects and autocatalysis in asymmetric organic synthesis,” opened new possibilities for pharmaceutical manufacturing.
The discovery enables the production of chiral drugs containing exclusively the necessary molecular form, allowing for greater therapeutic precision and reduced side effects. The award carries a monetary value of 12 million Swedish Kronor, approximately $1.2 million, to be divided between the recipients.
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