acyl group
C2Technical/Scientific
Definition
Meaning
A functional group in organic chemistry derived from a carboxylic acid by removal of a hydroxyl group (-OH).
In biochemistry, an acyl group is a key component in metabolic processes like fatty acid synthesis and protein acylation, often transferred by coenzyme A.
Linguistics
Semantic Notes
The term is almost exclusively used in chemistry and biochemistry. It refers to a specific molecular fragment, not a standalone compound. It is often part of a larger name (e.g., acetyl group, benzoyl group).
Dialectal Variation
British vs American Usage
Differences
No significant lexical or pronunciation differences. Spelling conventions for related compounds follow regional norms (e.g., 'colour' vs. 'color' in text, but not in the term itself).
Connotations
Identical technical connotations in both varieties.
Frequency
Equally low frequency and confined to scientific discourse in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The [compound] contains an acyl group.The enzyme transfers an acyl group from [donor] to [acceptor].An acyl group is derived from a carboxylic acid.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Core terminology in organic chemistry and biochemistry lectures, textbooks, and research papers.
Everyday
Never used.
Technical
Fundamental concept in synthetic organic chemistry, metabolic pathway descriptions, and enzymology.
Examples
By Part of Speech
verb
British English
- The protein is acylated.
- The enzyme acylates the substrate.
American English
- The protein gets acylated.
- The enzyme acylates the substrate.
adjective
British English
- Acyl transfer is a key reaction.
- The acyl derivative was purified.
American English
- Acyl transfer is a key reaction.
- The acyl derivative was purified.
Examples
By CEFR Level
- In organic chemistry, an acyl group has the formula R-CO-.
- The acyl group, derived from a carboxylic acid, is a central electrophile in nucleophilic acyl substitution reactions.
- Coenzyme A acts as a carrier for acyl groups during fatty acid metabolism.
Learning
Memory Aids
Mnemonic
Think 'ACid + YL' = ACYL. It's the part left from an acid when the 'OH' (hydroxyl) is lost.
Conceptual Metaphor
A HANDLE or TAG: The acyl group is often conceptualized as a molecular handle that can be transferred from one molecule to another, tagging or modifying it.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation as 'ацильная группа' without understanding it's a functional group, not a molecule.
- Do not confuse with 'acid group' (карбоксильная группа), which is the -COOH group it is derived from.
Common Mistakes
- Using 'acyl' to refer to the entire carboxylic acid molecule.
- Pronouncing 'acyl' with a hard 'c' (/ˈæk.ɪl/).
- Confusing 'acyl' with 'acetyl', which is a specific type of acyl group.
Practice
Quiz
What is the general formula for an acyl group?
FAQ
Frequently Asked Questions
No. An acetyl group (CH3CO-) is a specific, common type of acyl group. 'Acyl' is the general term for any R-CO- group.
Almost exclusively in university-level chemistry and biochemistry courses, textbooks, and research literature.
No, it is a reactive fragment that is always bonded to another atom or group, such as in acyl chlorides, esters, or amides.
Deacylation, the removal of an acyl group from a compound.