What does acetamide mean?
Acetamide is the simplest member of the amide family of organic compounds, with the formula CH₃CONH₂. Structurally, it can be viewed as acetic acid in which the acidic hydroxyl group has been replaced by an amino group. At room temperature it is a white, odorless crystalline solid that melts near 82 °C and dissolves readily in water and alcohol. Because it forms hydrogen bonds and remains stable at moderate temperatures, it has been used as a solvent and plasticizer, and it serves as a building block in organic synthesis. Chemists usually refer to it either by its common name, acetamide, or by its systematic name, ethanamide. Although rarely encountered outside laboratories and industry, the compound holds a certain scientific fascination: acetamide has been detected in interstellar molecular clouds, placing this modest molecule among the larger organic compounds identified in deep space.
nounA crystalline organic compound derived from acetic acid, in which the hydroxyl group of the carboxyl group is replaced by an amino group (CH₃CONH₂); it is the simplest amide of a carboxylic acid.
- The simplest carboxamide, CH₃CONH₂, a white crystalline solid used chiefly as a solvent and as a precursor in organic synthesis.
"The chemist purified the acetamide by recrystallizing it from hot water."
"Acetamide melts at around 82 °C and dissolves readily in water and alcohol."
"In the synthesis, the acid chloride reacted with ammonia to yield acetamide."
Rare in practice; used mainly when discussing substituted derivatives of acetamide collectively in technical chemistry contexts.
"Several substituted acetamides were screened for biological activity."
Acetamide isn't just made in labs — astronomers have detected it drifting in the vast molecular clouds of interstellar space, making it one of the more complex molecules known beyond Earth.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of acetamide
Acetamide derives from 'acet-', the combining form of Latin acetum, meaning vinegar, combined with '-amide', the suffix denoting compounds related to ammonia. The Latin acetum itself traces back to a root associated with sourness, which also underlies words such as acetic and acid. The term arose in nineteenth-century chemistry, when systematic nomenclature for nitrogen-containing derivatives of organic acids was being established.
How acetamide is actually used
Acetamide belongs to formal scientific register; it appears in chemistry texts, laboratory documentation, and patent literature rather than everyday speech. Its systematic IUPAC name is ethanamide, so both names appear in technical writing.
Easily confused with acetamide
Acrylamide (CH₂=CHCONH₂) contains a reactive vinyl group and is a known industrial chemical formed in some cooked foods, whereas acetamide (CH₃CONH₂) is the simple saturated amide of acetic acid.