What does acetylide mean?
An acetylide is a chemical compound formed when one or both hydrogen atoms of acetylene (C₂H₂) are replaced by a metal, or, more fundamentally, the negatively charged two-carbon ion C₂²⁻ that such compounds contain. The best-known example is calcium acetylide, commonly called calcium carbide, which reacts with water to release acetylene gas — a reaction once exploited in miners' lamps and portable lighting. In modern laboratories, acetylides serve as useful intermediates in organic synthesis, particularly for building carbon–carbon bonds. The term carries a note of caution: acetylides of heavy metals like copper and silver are highly sensitive explosives, making safe handling a central concern. Though rarely encountered outside technical settings, the word is essential reading in inorganic and organometallic chemistry, where these compounds bridge simple salts and reactive carbon species.
nounA binary compound of acetylene with a metal, typically formed by replacing the hydrogen atoms of acetylene with a metal; also, the divalent anion C₂²⁻ derived from acetylene.
- A compound formed between a metal and the anion C₂²⁻ derived from acetylene, such as calcium acetylide (calcium carbide).
- The divalent anion C₂²⁻ itself, in which carbon atoms are joined by a triple bond.
"Calcium acetylide reacts with water to release acetylene gas."
"The chemist stored the sodium acetylide under an inert atmosphere because it reacts violently with moisture."
"Miners' lamps of the early twentieth century burned acetylene generated on demand from calcium acetylide and water."
Regular plural; used when referring to multiple such compounds or ions.
"Heavy-metal acetylides must be handled with extreme care."
Drop calcium acetylide in water and it fizzes out acetylene — the same gas that once lit streetlamps and still welds steel today.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of acetylide
The word combines 'acetylene', the name of the hydrocarbon C₂H₂ coined in the nineteenth century, with the suffix '-ide' used for binary compounds and anions. 'Acetylene' itself derives from 'acetic', ultimately from Latin 'acetum' meaning vinegar, reflecting the compound's early association with acetic acid chemistry. The term arose as chemists systematically named the salts and derivatives of acetylene during the development of modern structural chemistry.
How acetylide is actually used
A technical term used almost exclusively in chemistry, particularly inorganic and organometallic chemistry. Acetylides of heavy metals such as copper and silver are notoriously shock-sensitive explosives, so the word often carries safety connotations in laboratory contexts.
Easily confused with acetylide
Acetylene is the flammable hydrocarbon gas C₂H₂ itself, while an acetylide is a compound or ion formed when one or both of its hydrogen atoms are replaced by a metal.