Scientists Henri Kagan and Kenso Soai have been awarded the 2026 Nobel Prize in Chemistry for resolving a long-standing puzzle regarding asymmetric “mirror image” molecules. The Royal Swedish Academy of Sciences announced the honor on Wednesday, citing the pair’s discovery of nonlinear effects and autocatalysis in asymmetric organic synthesis.
Kagan, 95, is from France, while Soai, 76, is from Japan. Their research demonstrated how chemical reactions can be directed to favor a single molecular mirror image, a capability that has become essential for pharmaceutical manufacturers designing synthesis pathways.
Many molecules vital to life exist in two forms that are reflections of each other, similar to left and right hands. However, living organisms almost exclusively utilize only one version, a phenomenon known as homochirality. This trait has challenged chemists for more than a century.
Peter Somfai, a member of the Nobel Committee for Chemistry, highlighted the practical implications of the work. He noted that different mirror-image versions of a drug can produce vastly different effects, making selective preparation critical. “In developing such methods, the findings of this year’s laureates are important. They provided powerful tools for that,” Somfai said.
Heiner Linke, chair of the committee, described the findings as a solution to a chemical mystery over 100 years old, specifically how homochirality can emerge spontaneously. He called the chemical reactions developed by the laureates “spectacular.”
Soai shared his reaction during a phone conference with Nobel Prize officials. He revealed he had been grocery shopping when he received the call. “This is the most exciting day in my life, I am very glad to share this prize with Professor Henri Kagan,” he said.
The chemistry Nobel is traditionally the third award announced during Nobel Week, following prizes in medicine and physics. The literature laureate is expected to be revealed on Thursday, with the peace prize following on Friday. Established by the will of Alfred Nobel, the prizes have been awarded since 1901. Nobel, a chemist who amassed wealth in the 19th century through inventions like dynamite, is the namesake of the awards.
At 95 and 76, Kagan and Soai prove that curiosity never retires. Their work is a monumental leap for modern pharmaceuticals.
I’m still wrapping my head around how autocatalysis drives this. Does this mean we can now synthesize any chiral drug on demand?
Finally, the homochirality mystery gets its due. Soai’s grocery shopping anecdote is priceless, truly a moment of pure serendipity.