ethyl group
Definition
- Noun:
- A univalent hydrocarbon radical: The ethyl group is a specific atomic grouping, represented by the formula
−C₂H₅or−CH₂CH₃. It is not a stable compound on its own but is a fundamental component or "building block" attached to other molecules within organic chemistry.
Usage
The term "ethyl group" is used almost exclusively in scientific contexts, particularly in organic chemistry, biochemistry, and related fields. It specifies a particular two-carbon unit within a larger molecular structure.
* It functions as a modifier within compound names, indicating the presence of this specific radical.
* Example: In "ethyl alcohol," the name specifies that an ethyl group is attached to a hydroxyl (−OH) group.
Examples
- Noun:
- The organic compound contains an ethyl group bonded to a nitrogen atom.
- In the reaction, a methyl group is replaced by an ethyl group.
- The difference between methanol and ethanol is the presence of a methyl versus an ethyl group.
Advanced Usage
- "Ethyl radical": In specific chemical contexts, especially involving free radicals, the term "ethyl radical" () may be used to refer to the ethyl group when it exists independently with an unpaired electron, though this is a highly reactive, transient species.
- Abbreviation in formulas: It is commonly abbreviated as Et- in structural formulas and chemical nomenclature (e.g., EtOH for ethanol).
Variants and Related Words
- Ethyl (adj): Pertaining to or containing the ethyl group. This is the adjectival form used in compound names.
- Ethyl acetate is a common solvent.
- Ethane (n): The parent alkane hydrocarbon () from which the ethyl group is conceptually derived by removing one hydrogen atom.
- Ethylene (n): A different two-carbon hydrocarbon () with a double bond, which is a distinct molecule and not a group.
Synonyms
- Ethyl radical: (In the context of free radical chemistry or as a general synonym for the group).
−C₂H₅group: A formula-based synonym.
Related Phrases / Concepts
- Alkyl group: The ethyl group is a specific, common example of an alkyl group, which is a general term for a saturated hydrocarbon radical derived from an alkane.
- Functional group modification: The process of introducing, removing, or changing an ethyl group on a molecule is a fundamental type of organic synthesis.
Noun
-
the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom
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