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Yes—but only one specially engineered carbene has been shown to persist under the conditions reported. In a 2025 study, researchers generated a chlorinated, carborane-shielded N-heterocyclic carbene in water and observed no decomposition during six months of NMR monitoring in a water-saturated, single-phase THF solution. That is evidence for this protected molecule, not a general property of carbenes.
What the researchers found
The study, published in Science Advances on April 11, 2025, reports the synthesis and characterization of a carbene that the authors generated in water and isolated as a stable species. They used nuclear magnetic resonance (NMR) spectroscopy and single-crystal X-ray diffraction to characterize it. Read the paper in Science Advances or consult its PubMed record.
The persistence claim has a specific experimental scope: the authors monitored the compound in a water-saturated, single-phase tetrahydrofuran (THF) solution and reported no decomposition over six months. It does not mean that ordinary carbenes remain intact indefinitely in pure water, or that this molecule is stable in every aqueous mixture or condition.
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A carbene contains a carbon atom with two bonds and a pair of nonbonding electrons, making many carbenes highly reactive. In this molecule, the carbene sits in an N-heterocyclic core whose nitrogen substituents carry bulky, chlorinated 10-vertex carborane clusters. The proposed design combines physical shielding from the large cages with an electronic effect from chlorination that favors carbene formation. These are the researchers’ design rationale, not evidence that other carbenes will behave the same way.
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Chemistry World’s coverage describes the clusters as drawing electron density away from the divalent carbon while also physically shielding it. The compound is also exceptionally unreactive, so its persistence should not be mistaken for evidence that it makes a useful catalyst.
What this means for Breslow’s hypothesis
In 1958, Ronald Breslow proposed that thiamine (vitamin B1) could generate a transient N-heterocyclic carbene involved in biochemical catalysis. The 2025 result demonstrates that a carbene can be generated and persist in an aqueous environment when specially protected, which is relevant to the broader chemical question.
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It does not recreate vitamin B1 catalysis or show that the carbene proposed in an enzyme is stable in bulk water. The researchers say their carborane scaffold does not exactly mimic the active site of the enzymes Breslow considered. Carbene specialist Albrecht Berkessel, quoted by Chemistry World, also cautioned that Breslow’s hypothesis does not require a carbene that is stable in liquid water. The study is therefore a model-system result, not proof of the proposed biological mechanism.
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What the result does—and does not—establish
- Established: The authors report generating and characterizing one specially designed, carborane-shielded N-heterocyclic carbene in water.
- Observed: No decomposition during six months of NMR monitoring in a water-saturated, single-phase THF solution.
- Not established: That carbenes generally are stable in water, that the molecule remains stable under all aqueous conditions, or that it reproduces an enzyme’s active site.
- Not demonstrated: A practical catalytic application; the compound is described as exceptionally unreactive.
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