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In a 2018 laboratory experiment, researchers used hydroxymethylene—a highly reactive carbene and isomer of formaldehyde—to make glycolaldehyde and glyceraldehyde, two simple sugar precursors. The reaction took place in a solid-argon matrix at 3 K (−270 °C) and needed no water or other solvent in that setup. The result suggests a possible route for sugar-related chemistry in space; it does not show that the reaction occurs there or settle how sugars formed on early Earth.
What the researchers made
Hydroxymethylene is a short-lived, highly reactive molecule known as a carbene. It is an isomer of formaldehyde: the two have the same atoms but a different arrangement. In the reported experiment, hydroxymethylene reacted with formaldehyde to produce glycolaldehyde and glyceraldehyde. These are simple sugar precursors that can take part in further reactions leading toward larger carbohydrates.
The study, by André K. Eckhardt, Michael M. Linden, Raffael C. Wende, Bastian Bernhardt and Peter R. Schreiner, was published in Nature Chemistry in 2018 as “Gas-phase sugar formation using hydroxymethylene as the reactive formaldehyde isomer.” The lab publication record lists Eckhardt and Linden as equal contributors. The paper’s DOI record identifies the publication.
How the experiment worked
- The team passed glyoxylic acid through a red-hot quartz tube to generate hydroxymethylene.
- They trapped the resulting products in solid argon at 3 K (−270 °C), the temperature reported by Chemistry World’s 2018 report.
- In that cryogenic matrix, hydroxymethylene reacted with formaldehyde to form glycolaldehyde and glyceraldehyde without water or another solvent.
This was a controlled laboratory demonstration in a solid-argon matrix, not an experiment performed in space. The absence of water applies to the initial reaction under those conditions; it does not mean every later step toward more complex sugars can proceed without water.
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How this differs from the formose reaction
The established formose reaction begins with formaldehyde in water and uses a base. As Chemistry World describes it, the process can produce a complex mixture of sugars and polymeric compounds after hours of reaction. Ribose, a sugar important in biology, is unstable under conditions in which it forms.
The hydroxymethylene route is complementary rather than a replacement for formose chemistry. Its notable result is the formation of simple sugar precursors without an aqueous solvent in the initial laboratory reaction. Further chemistry is a separate question: prebiotic-chemistry researcher Saidul Islam cautioned that glyceraldehyde eventually needs to reach an aqueous environment for subsequent reactions.
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What the result may mean for space—and what it does not prove
Schreiner proposed that hydroxymethylene might form in space through a reaction between carbon dioxide and water. If so, the laboratory finding offers a possible way for this reactive molecule to contribute to sugar-precursor chemistry beyond Earth. But the reported experiment did not observe the proposed sequence in space, nor did it establish that the products form there by this pathway. The cosmic implication remains a possibility, not a confirmed explanation.
The same caution applies to early Earth. The experiment did not demonstrate that this route produced sugars, ribose or the ingredients for life on the young planet. Whether it contributed to prebiotic chemistry remains unsettled, especially because later reactions involving glyceraldehyde may require an aqueous setting.
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Why the finding matters
The work broadens the set of chemical routes researchers can consider: a simple sugar-precursor reaction may begin without liquid water, even though follow-on chemistry can depend on water. That distinction matters when thinking about environments where aqueous conditions are absent or intermittent. It is a useful laboratory result and a plausible lead for astrochemistry, but not a complete account of carbohydrate formation in space or on early Earth.
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