Henri Kagan And Kenso Soai Win 2026 Nobel Prize In Chemistry

French chemist Henri B. Kagan and Japanese chemist Kenso Soai won the 2026 Nobel Prize in Chemistry on Wednesday for discoveries that helped explain how nature can favor one mirror-image form of a molecule and gave chemists powerful ways to control that process.

The Royal Swedish Academy of Sciences announced the award “for the discovery of non-linear effects and autocatalysis in asymmetric organic synthesis.” The work addresses homochirality, the tendency of living systems to use predominantly one of two mirror-image molecular forms.

Many molecules can exist in two forms that resemble left and right hands. Those forms can behave differently in biological systems, making control over molecular “handedness” important in pharmaceutical development and other areas of chemistry.

A Century-Old Chemical Mystery

Kagan, 95, developed methods in the 1980s that could steer chemical reactions toward an excess of one mirror-image form. Chemists have long regarded him as the “father” of asymmetric catalysis, a characterization, not an academy title. “His discovery has been revolutionary for chemists who develop reactions for the manufacture of pharmaceuticals, flavours, scents and new materials,” the Nobel Committee for Chemistry said.

Soai, 76, later demonstrated a reaction in which the product accelerates its own formation while amplifying one molecular handedness. His 1995 work became known as the Soai reaction.

“The Soai reaction is one of the most spectacular chemical experiments ever conducted,” the committee said.

Work Has Broad Pharmaceutical Importance

The laureates’ research has helped chemists understand and control asymmetric synthesis, an important consideration in drug development because two mirror-image forms of the same compound can interact differently with the body.

The award comes 25 years after Kagan was not included in the 2001 chemistry Nobel, which recognized William Knowles, Ryoji Noyori and Barry Sharpless for work on chirally catalyzed reactions.

The 2026 chemistry prize follows Monday’s medicine award to Karl Deisseroth, Peter Hegemann and Georg Nagel for discoveries involving light-gated ion channels and optogenetics, as reported by The Dallas Express. On Tuesday, Belgian scientist Francis Halzen was awarded the Nobel Prize in physics for using Antarctic ice to capture particles from the distant cosmos.

Kagan and Soai will share the 12 million Swedish kronor prize, worth about $1.2 million. Nobel laureates traditionally receive their medals and diplomas in Stockholm on December 10, the anniversary of Alfred Nobel’s death.