STOCKHOLM: A screen displays the co-winners of the 2021 Nobel Prize in Chemistry, Germany's Benjamin List (left) and David MacMillan of the US, during a press conference at the Royal Swedish Academy of Sciences yesterday. - AFP

STOCKHOLM: Germany's Benjamin List and US-based David MacMillan yesterday won the Nobel Chemistry Prize for developing a tool to build molecules which has helped make chemistry more environmentally friendly. Their tool, which they developed independently of each other in 2000, can be used to control and accelerate chemical reactions, exerting a big impact on drugs research.

Prior to their work, scientists believed there were only two types of catalysts - metals and enzymes. The new technique, which relies on small organic molecules and which is called "asymmetric organocatalysis" is widely used in pharmaceuticals, allowing drug makers to streamline the production of medicines for depression and respiratory infections, among others.

Organocatalysts allow several steps in a production process to be performed in an unbroken sequence, considerably reducing waste in chemical manufacturing, the Nobel committee at the Royal Swedish Academy of Sciences said. List and MacMillan, both 53, will share the 10-million-kronor ($1.1-million) prize. "I thought somebody was making a joke. I was sitting at breakfast with my wife," List told reporters by telephone during a press conference after the prize was announced.

In past years, he said his wife has joked that he should keep an eye on his phone for a call from Sweden. "But today we didn't even make the joke," List, who is a director at the Max Planck Institute in Germany, said. "It's hard to describe what you feel in that moment, but it was a very special moment that I will never forget."

Asked about what the prize would mean for his future as a researcher, List promised he had "a few more plans". "I always like to go to the extremes. 'Can we do things that were just impossible before?' List told reporters. "I hope I live up to this to this recognition and continue discovering amazing things."

MacMillan, born in Scotland but a professor at Princeton University in the US, also thought he was the target of a prank, saying he originally went back to sleep when he started receiving texts from Sweden early yesterday. "I am shocked, and stunned and overjoyed," MacMillan said in a statement from Princeton University.

"Organocatalysis was a pretty simple idea that really sparked a lot of different research," the professor added. "The part we're just so proud of is that you don't have to have huge amounts of equipment and huge amounts of money to do fine things in chemistry."

Explaining the award, the Academy said "many research areas and industries are dependent on chemists' ability to construct molecules that can form elastic and durable materials, store energy in batteries or inhibit the progression of disease". "This work requires catalysts, which are substances that control and accelerate chemical reactions, without becoming part of the final product," it added.

List was the first to prove that the amino acid "proline", which he called his favorite catalyst, could drive an aldol reaction, which is when carbon atoms from two different molecules are bonded together. "Compared to both metals and enzymes, proline is a dream tool for chemists. It is a very simple, cheap and environmentally friendly molecule," the Academy said.

Since their discovery, developments in the field can "almost be likened to a gold rush", with List and MacMillan designing "multitudes of cheap and stable organocatalysts", the science body noted. For example, in 2011, researchers were able to make the production process for strychnine, today mostly used as a pesticide, 7,000 times more efficient, reducing it from 29 chemical reactions to just 12, it said.

Ahead of yesterday's announcement, analysts had said the chemistry field was wide open. According to Clarivate, which maintains a list of potential Nobel Prize winners, more than 70 researchers had what it takes to be considered for the prize, given the thousands of citations they have received in scientific papers. Last year, the Nobel went to France's Emmanuelle Charpentier and America's Jennifer Doudna, for developing the gene-editing technique known as CRISPR-Cas9 - DNA snipping "scissors".

The Nobel season continues with the two most closely watched prizes, literature today and peace tomorrow. The winner of the economics prize will be announced on Monday. The medicine prize kicked off the 2021 Nobel season on Monday, going to David Julius and Ardem Patapoutian for breakthroughs that paved the way for the treatment of chronic pain. The physics prize followed Tuesday, when half was awarded to US-Japanese scientist Syukuro Manabe and Klaus Hasselmann for climate models, and the other half to Italy's Giorgio Parisi for work on the theory of disordered materials and random processes. - AFP