Chemists Confirm 67-Year-Old Theory About Vitamin B1

Breakthrough stabilizes reactive carbene molecule in water, paving way for greener chemistry

Apr. 12, 2026 at 12:00am

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A bold, abstract painting in muted earth tones depicting a complex, interlocking molecular structure, conveying the scientific breakthrough of stabilizing a reactive carbene in water.A breakthrough in stabilizing a highly reactive carbene molecule in water could lead to greener, more efficient chemical production methods.Riverside Today

Chemists have achieved a long-sought breakthrough by stabilizing an extremely reactive carbene molecule in water, confirming a 67-year-old theory about vitamin B1. The discovery not only resolves a biochemical puzzle, but also points toward cleaner, more efficient methods for producing pharmaceuticals.

Why it matters

This research validates a hypothesis first proposed in 1958 by chemist Ronald Breslow, who theorized that vitamin B1 could briefly form a carbene-like structure to drive essential biochemical reactions. However, carbenes are notoriously unstable, especially in water, making them nearly impossible to study directly. By developing a protective molecular structure to shield the carbene, researchers have now been able to observe and analyze this reactive intermediate, opening new possibilities for replicating the chemistry of living cells.

The details

The key breakthrough was the team's ability to create a stable carbene in water, something long thought to be impossible. They developed a molecular 'suit of armor' that shields the reactive carbene center from water and other molecules, allowing them to isolate and observe the carbene for months using advanced analytical techniques. This not only confirms Breslow's 1958 hypothesis, but also points the way toward using carbenes as more environmentally friendly catalysts in pharmaceutical production and other industrial processes.

  • In 1958, chemist Ronald Breslow proposed the idea that vitamin B1 could briefly form a carbene-like structure.
  • For decades, scientists were unable to directly observe or study such a reactive carbene molecule in water.

The players

Ronald Breslow

A chemist at Columbia University who first proposed in 1958 that vitamin B1 could transform into a carbene to enable key biochemical reactions.

Vincent Lavallo

A professor of chemistry at UC Riverside and the corresponding author of the paper describing the breakthrough.

Varun Raviprolu

The first author of the paper, who completed the research as a graduate student at UCR and is now a postdoctoral researcher at UCLA.

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What they’re saying

“This is the first time anyone has been able to observe a stable carbene in water. People thought this was a crazy idea. But it turns out, Breslow was right.”

— Vincent Lavallo, Professor of Chemistry, UC Riverside

“We were making these reactive molecules to explore their chemistry, not chasing a historical theory. But it turns out our work ended up confirming exactly what Breslow proposed all those years ago.”

— Varun Raviprolu, Postdoctoral Researcher, UCLA

What’s next

Researchers plan to continue exploring the use of stabilized carbenes as more environmentally friendly catalysts in pharmaceutical production and other industrial processes.

The takeaway

This breakthrough not only resolves a long-standing biochemical mystery, but also opens new possibilities for replicating the complex chemistry of living cells and developing greener methods for producing essential medicines and materials.