What does ethanal mean?
Ethanal is the systematic chemical name for acetaldehyde, a simple organic compound with the formula CH₃CHO. It is a colourless, highly volatile, and flammable liquid with a pungent, somewhat fruity odour, classified chemically as the smallest member of the aldehyde family after formaldehyde. Ethanal occurs naturally in trace amounts in ripe fruit, coffee, and bread, but it is also manufactured on an enormous industrial scale, chiefly by the Wacker oxidation of ethylene, where it serves as a key intermediate in producing acetic acid and various resins and plastics. In biochemistry, ethanal plays a familiar role: it is the immediate product formed when the liver metabolises ethanol, and its toxicity accounts for many symptoms of alcohol intolerance and hangover. The name is standard in IUPAC nomenclature and chemistry teaching, though "acetaldehyde" is still more widely encountered outside technical contexts.
nounA colourless, volatile, flammable liquid aldehyde with the formula CH₃CHO, having a sharp, fruity odour; it is the systematic IUPAC name for what is commonly called acetaldehyde and is an important industrial intermediate.
- Chemistry: the aldehyde CH₃CHO (acetaldehyde), a colourless volatile liquid produced industrially on a large scale as an intermediate for acetic acid, plastics, and other chemicals.
"The oxidation of ethanol in the liver first yields ethanal before further conversion to acetic acid."
"In the liver, alcohol dehydrogenase converts ethanol into ethanal, a far more toxic compound."
"Industrially, ethanal is produced by the Wacker process from ethylene and serves chiefly as a precursor to acetic acid."
As a chemical substance, "ethanal" is normally uncountable; the plural appears only when referring to multiple samples or preparations of the compound.
"The two ethanals were analysed separately by gas chromatography."
When your body breaks down alcohol, ethanal — not the alcohol itself — is the compound largely responsible for the flushing, nausea, and misery of a hangover.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ethanal
The name "ethanal" was coined under systematic IUPAC nomenclature by combining "ethan(e)" — itself derived from "ethyl", which traces back through German to the French "éther", ultimately from the Greek "aithēr" meaning upper air or clear sky — with the suffix "-al" denoting an aldehyde. "Aldehyde" abbreviates the New Latin "alcohol dehydrogenatus", meaning alcohol deprived of hydrogen, since aldehydes are formally obtained by removing hydrogen from an alcohol. The term thus reflects nineteenth-century organic chemistry's effort to name compounds transparently by their structure.
How ethanal is actually used
"Ethanal" is the systematic IUPAC name used mainly in chemistry education and technical writing; "acetaldehyde" remains the more common name in everyday scientific literature and industry.
Easily confused with ethanal
Ethanol is drinking/industrial alcohol (CH₃CH₂OH), whereas ethanal is the oxidised aldehyde form of that alcohol (CH₃CHO) — they differ by a single letter and one step of oxidation.