Acetyl group
In organic chemistry, acetyl is a functional group with the chemical formula −COCH3 and the structure −C(=O)−CH3. It is sometimes represented by the symbol Ac (not to be confused with the element actinium). In IUPAC nomenclature, acetyl is called ethanoyl.
| Names | |
|---|---|
| IUPAC name
Acetyl (preferred to ethanoyl) | |
| Systematic IUPAC name
Methyloxidocarbon(•) (additive) | |
| Identifiers | |
3D model (JSmol) |
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| Abbreviations | Ac |
| 1697938 | |
| ChEBI | |
| ChemSpider | |
| 786 | |
PubChem CID |
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SMILES
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| Properties | |
| C2H3O | |
| Molar mass | 43.045 g·mol−1 |
| Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
−15 to −9 kJ mol−1 |
| Related compounds | |
Related compounds |
Acetone Carbon monoxide Acetic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
The acetyl group contains a methyl group (−CH3) single-bonded to a carbonyl (C=O), making it an acyl group. The carbonyl center of an acyl radical has one nonbonded electron with which it forms a chemical bond to the remainder R of the molecule.
The acetyl moiety is a component of many organic compounds, including acetic acid, the neurotransmitter acetylcholine, acetyl-CoA, acetylcysteine, acetaminophen (also known as paracetamol), and acetylsalicylic acid (also known as aspirin).
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