Scientists at the University of Würzburg have produced and isolated oxoboranes — molecules with a triple bond between boron and oxygen that chemists had pursued since the early 1960s — using a reaction that forms them unexpectedly from simple starting materials, Science Daily reported. The findings, published in Nature Chemistry, were led by Professor Holger Braunschweig, with computational support from researchers led by Professor Ashwini K. Phukan at Tezpur University in India.
Boron rarely forms triple bonds, and until now no stable organic oxoborane had ever been isolated for study under ordinary laboratory conditions. Researchers had detected and trapped the compounds only under extreme conditions or gathered indirect evidence of their existence.
An Unexpected Reaction Produces the Elusive Molecules
The breakthrough came from experiments that initially appeared to be heading in a different direction. Two doctoral students at Würzburg, Lukas Lubczyk and Christian Markl, were independently investigating reactions between a compound called a diboracumulene and various ketones when both noticed distinctive orange or yellow solids forming.
“The discovery was a pleasant surprise. And when Christian came to me with his compound, I knew we were onto something,” Lubczyk said.
Oxoboranes emerged as the main products even though several other chemical outcomes had appeared more likely.
Three Compounds Made, Wider Range Possible
Using the new method, the scientists prepared three different oxoboranes. Because the approach worked with multiple compounds, the team is now investigating how broadly it can be applied — both to produce additional oxoboranes and to create other elusive compounds involving elements across the periodic table.
Braunschweig’s Record of Boron Bonds
The oxoborane work builds on milestones from the same laboratory. In 2012, the team reported the first molecule containing a triple bond between two boron atoms, and in 2025 the researchers produced the first neutral molecule featuring a triple bond between boron and carbon. The latest result closes the remaining gap among the first-row p-block elements.
International Collaboration and Funding
The study was a collaboration between the Würzburg team and Phukan’s group at Tezpur University, whose computational research supported the work. Funding came from the German Research Foundation (DFG), the German Academic Exchange Service (DAAD), and India’s Department of Science & Technology (DST).
What Are Oxoboranes and Why Did They Take 60 Years to Isolate?
What is an oxoborane? It is a molecule built around a triple bond between boron and oxygen, in which the two atoms share three pairs of electrons. Chemists had pursued stable examples since at least the early 1960s but could previously obtain them only under extreme conditions or as indirect evidence.
Why does the new method matter? The Würzburg team showed the compounds form as main products from reactions between a diboracumulene and ordinary ketones, using relatively simple starting materials. Because three different oxoboranes were prepared this way, the technique could open access to a much wider range of these molecules.
Who led the research? Professor Holger Braunschweig led the University of Würzburg team, with computational support from Professor Ashwini K. Phukan’s group at Tezpur University in India, and the findings were published in Nature Chemistry.
The team’s next step is to test how broadly the technique applies to other oxoboranes and to other elusive compounds across the periodic table.
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