Henri Kagan, Kenso Soai win Nobel chemistry prize for ‘mirror image’ work

Henri Kagan of France, aged 95, and Kenso Soai of Japan, aged 76, have been awarded the 2026 Nobel Prize in Chemistry for their discovery of nonlinear effects and autocatalysis in asymmetric organic synthesis, a breakthrough that explains how chemical reactions can be steered to produce a single molecular “mirror image.” Their work resolves the long‑standing puzzle of homochirality—the tendency of living organisms to use only one of two possible mirror‑image forms of a molecule—by showing how spontaneous symmetry breaking can occur in laboratory reactions. The Royal Swedish Academy of Sciences announced the prize on Wednesday, emphasizing that the laureates’ findings provide powerful tools for selectively preparing the biologically active enantiomer of pharmaceutical compounds, a critical step in drug manufacturing.

The significance of the discovery lies in its practical impact on the pharmaceutical industry, where the left‑handed and right‑handed versions of a drug can have dramatically different biological effects. Peter Somfai, a member of the Nobel Committee for Chemistry, highlighted that the ability to control chirality is essential for producing safe and effective medicines, noting that the laureates’ methods enable chemists to favor the desired enantiomer with unprecedented precision. Heiner Linke, chair of the committee, described the work as a “spectacular” solution to a century‑old chemical mystery, underscoring how the nonlinear and autocatalytic mechanisms identified by Kagan and Soai illuminate the origin of homochirality in nature.

The award follows last year’s chemistry prize, which honored advances in metal‑organic frameworks, and comes amid the broader Nobel week schedule that will later reveal laureates in literature, peace and economics. Soai, speaking by phone from a shopping trip, expressed surprise at the news, while the Nobel Committee’s statements suggest the laureates’ research will continue to shape synthetic strategies across chemistry, influencing not only drug synthesis but also fundamental studies of molecular self‑organization.

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