Dihydroxymethylidene or carbonous acid is a chemical compound with formula . It is an unstable tautomer of formic acid. There is no evidence that this compound exists in solution, but the molecule has been detected in the gas phase. Many related carbenes are known, although they are often transient.
Dihydroxymethylidene or carbonous acid is a chemical compound with formula . It is an unstable tautomer of formic acid. There is no evidence that this compound exists in solution, but the molecule has been detected in the gas phase. Many related carbenes are known, although they are often transient.
== Production and properties== Dihydroxymethylidene is produced in the gas phase by high vacuum flash vacuum pyrolysis of oxalic acid:
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).