STOCKHOLM — Henri B. Kagan of France and Kenso Soai of Japan have been awarded the 2026 Nobel Prize in Chemistry for their groundbreaking work on asymmetric organic synthesis, resolving a century-old mystery in molecular science.
The Royal Swedish Academy of Sciences announced the winners on Wednesday in Stockholm, recognizing their contributions to understanding and controlling chirality—the phenomenon where molecules exist in two mirror-image forms with distinct properties. Their discoveries have become foundational for pharmaceutical development, enabling chemists to produce precise versions of molecules for medical use.
Kagan and Soai’s research specifically addressed homochirality, the biological preference for one mirror-image form over another in life’s building blocks, such as amino acids. This preference is critical in drug design, where one form of a molecule may treat disease while its mirror image could be ineffective or harmful. For example, the molecule carvone smells like mint in one form and caraway in the other.
The Nobel Committee highlighted that their work provides a solution to a long-standing question: how homochirality emerges spontaneously in nature. Kagan’s early research in the 1980s laid the theoretical groundwork, while Soai later demonstrated the first chemical reaction capable of producing only one mirror-image form—a process now known as the Soai reaction.
Impact on Medicine and Chemistry
Experts emphasize that this discovery is not confined to a single drug but has transformed the entire field of organic synthesis. Rigoberto Hernandez, president of the American Chemical Society, stated that modern medicines would not be possible without this chemistry, as it underpins the design of catalysts and reaction pathways used in drug manufacturing.
Peter Somfai, a member of the Nobel Committee for Chemistry, described their work as “probably the coolest experiment in organic chemistry,” noting that their findings reshaped understanding of how chirality is created, amplified, and transmitted. The committee also noted that their achievements represent a feat “never previously achieved by anyone other than life itself.”
About the Laureates
- Henri B. Kagan, 95, is affiliated with Université Paris-Sud in Orsay, France.
- Kenso Soai, 95, is based at the Tokyo University of Science in Japan.
Their work builds on decades of research into non-linear effects and autocatalysis, processes where a reaction’s outcome becomes self-reinforcing, leading to the dominance of one molecular form.
Nobel Prize Context
The chemistry prize follows the announcement of the 2026 Nobel Prize in Physiology or Medicine on Monday, awarded for advances in optogenetics, and the physics prize on Tuesday for neutrino research. The literature prize is scheduled for Thursday, the peace prize on Friday, and the economics prize on Monday. Each prize carries a cash award of 12 million Swedish kronor (approximately $1.2 million).
The Nobel Prizes, established in Alfred Nobel’s will, recognize outstanding contributions in science, literature, and peace, with the economics prize added later in his honor.