Scientists Discover New Chemical Reaction That Could Transform Medicine and Plastics

A Reaction Nobody Saw Coming

Chemists at Flinders University in Australia, working with collaborators at the University of Liverpool, have confirmed the discovery of an entirely new type of chemical reaction. Dubbed trisulfide metathesis, the process spontaneously breaks and reforms sulfur-sulfur bonds when placed in certain solvents, completing in some cases within seconds at room temperature.

The reaction requires no external reagents, no heat, no light, and no catalysts. Two trisulfide molecules simply swap the chemical groups attached to their ends, a partner-swapping process that is remarkably fast, selective, and easily reversible.

Why Sulfur Bonds Matter

Sulfur-sulfur bonds are everywhere in biology and industry. They appear in peptides, proteins, drug molecules, and polymers such as vulcanised rubber. Until now, selectively altering these bonds has required harsh conditions or aggressive chemical reagents, making manipulation difficult and often wasteful.

The mechanistic model developed by the team explains exactly how and why these bonds rearrange under specific conditions, providing a foundation for a wide range of practical applications.

From Cancer Drugs to Recyclable Plastics

The team has already demonstrated several high-value applications. In pharmaceuticals, they successfully modified calicheamicin, an anti-tumour compound containing a trisulfide bond, and built chemical libraries relevant to drug discovery.

In materials science, the reaction enabled the creation of polyethylene analogs that can be moulded, used, and then chemically broken back down into their original building blocks, a significant step toward closed-loop plastics recycling. A new Australian Research Council Discovery Grant will fund expansion of this chemistry to recyclable rubber, foam, and fibres.

A Rare and Versatile Discovery

The research involved more than a dozen chemists from Australian and British universities. Senior author Professor Justin Chalker noted that discovering an entirely new reaction is rare, and having one useful across so many fields is rarer still. Co-author Doctor Tom Hasell called the demonstrated applications only the tip of the iceberg.