The Nobel Prize goes to two chemists

Henri Kagan and Kensō Soai won the 2026 Nobel Prize in Chemistry for solving how to make molecules with only one mirror-image form, opening new ways to manufacture drugs.

Why mirror molecules matter

Some molecules are chiral, existing in two mirror-image forms called enantiomers. Living organisms contain almost exclusively one form, a phenomenon called homochirality. The two forms behave differently.

The drug problem with mirror molecules

In drug development, one enantiomer produces the desired therapeutic effect while the other can cause harmful side effects. Scientists struggled to control which version they produced during synthesis.

The theoretical breakthrough

In nineteen fifty-three, physicist Charles Frank proposed three conditions for reproducing homochirality: an asymmetric reaction, amplification of the imbalance, and autocatalysis, where the reaction produces its own catalyst.

Kagan's discovery of the nonlinear effect

Beginning in the early nineteen eighties, Henri Kagan realized that mixing two versions of a chiral catalyst could create three combinations, not two. The mixed combination could slow the reaction and favor one final form.

Soai's autocatalytic breakthrough

Inspired by Kagan, Kensō Soai created a reaction where the product itself acted as a catalyst. Starting with five-pyrimidylalkanol where one version was just two percent more abundant, he achieved eighty-seven percent by reaction's end.

Near-perfect molecular purity achieved

By twenty oh three, Soai engineered a reaction with no initial orientation that produced ninety-nine point ninety-nine percent of a single enantiomer. The Nobel Committee said only life itself had previously achieved this feat.

“Other than life itself, no one had previously achieved this feat.”