[grey_whiskers]

If these come into proximity, glycolaldehyde isn't too hard to get. It's a small molecule.

According to a prior poster, "two carbon atoms, two oxygen atoms and four hydrogen atoms"

OK, so the most likely reaction given common components of interstellar dust is...?

What is the rate constant for the reaction, at, say, 5 K?

Please recall, I'm asking, not claiming to know already.

[Doctor Stochastic]

Link to a review article. It's four years old so there are probably newer articles.