carbanion: meaning, definition, pronunciation and examples
Very LowTechnical/Scientific
Quick answer
What does “carbanion” mean?
A negatively charged organic ion containing a carbon atom with an unshared pair of electrons.
Audio
Pronunciation
Definition
Meaning and Definition
A negatively charged organic ion containing a carbon atom with an unshared pair of electrons.
A reactive intermediate in organic chemistry where a carbon atom bears a negative charge and a lone pair of electrons, making it a strong base and nucleophile.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling and pronunciation are consistent.
Connotations
Purely technical with no regional connotations.
Frequency
Equally rare and specialized in both dialects, confined to advanced chemistry contexts.
Grammar
How to Use “carbanion” in a Sentence
The reaction proceeds via a carbanion intermediate.Deprotonation of the substrate yields a carbanion.Vocabulary
Collocations
Examples
Examples of “carbanion” in a Sentence
adjective
British English
- carbanion chemistry
- carbanion stability studies
American English
- carbanion reactivity
- carbanion formation step
Usage
Meaning in Context
Business
Not used.
Academic
Used in advanced organic chemistry textbooks, journals, and lectures to describe reaction mechanisms.
Everyday
Never used.
Technical
Core term in mechanistic organic chemistry discussions and research papers.
Vocabulary
Synonyms of “carbanion”
Neutral
Weak
Vocabulary
Antonyms of “carbanion”
Watch out
Common Mistakes When Using “carbanion”
- Misspelling as 'carbonion' or 'carb anion'.
- Confusing it with a carbocation (positively charged carbon).
- Using it to refer to any negatively charged organic molecule rather than the specific reactive intermediate.
FAQ
Frequently Asked Questions
Most simple carbanions are highly reactive and not stable under normal conditions. Their stability can be increased by resonance (e.g., enolates), adjacent electron-withdrawing groups, or in organometallic compounds.
A carbanion has a negatively charged carbon atom with a lone pair (C:⁻), acting as a nucleophile/base. A carbocation has a positively charged carbon atom with an empty p-orbital (C⁺), acting as an electrophile.
Carbanions are key intermediates in reactions like aldol condensations, Grignard reagent additions, Wittig reactions, and alkylations via enolates.
Yes, an enolate anion is a classic example of a resonance-stabilised carbanion where the negative charge is delocalised onto an sp² oxygen atom. The carbon contributing to the carbanion character is sp² hybridised.
A negatively charged organic ion containing a carbon atom with an unshared pair of electrons.
Carbanion is usually technical/scientific in register.
Carbanion: in British English it is pronounced /kɑːˈbænaɪən/, and in American English it is pronounced /kɑːrˈbænaɪən/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: CARBon + ANION (a negative ion). A carbanion is a carbon atom acting as an anion.
Conceptual Metaphor
A carbon atom 'hungry' for a positive charge (electrophile), acting as a nucleophilic base.
Practice
Quiz
What is the key feature of a carbanion?