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sulfonium: meaning, definition, pronunciation and examples

C2
UK/sʌlˈfəʊnɪəm/US/sʌlˈfoʊniəm/

Technical/Scientific

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Quick answer

What does “sulfonium” mean?

A positively charged ion (cation) containing a central sulfur atom bonded to three organic groups.

Audio

Pronunciation

Definition

Meaning and Definition

A positively charged ion (cation) containing a central sulfur atom bonded to three organic groups.

Any of a class of organosulfur compounds with the general structure R3S+, where R represents an alkyl or aryl group. These ions are important intermediates in organic chemistry and biochemistry.

Dialectal Variation

British vs American Usage

Differences

The spelling: British 'sulphonium' vs. American 'sulfonium'. The pronunciation follows the spelling difference.

Connotations

Identical technical meaning; no difference in connotation.

Frequency

Equally rare outside scientific contexts. Frequency within chemistry texts is identical.

Grammar

How to Use “sulfonium” in a Sentence

sulfonium [noun]sulfonium [preposition] [noun] (e.g., sulfonium in organic synthesis)[adjective] sulfonium

Vocabulary

Collocations

strong
sulfonium saltsulfonium ionsulfonium ylidetrimethylsulfonium
medium
sulfonium compoundsulfonium intermediatestable sulfonium
weak
formation of sulfoniumreaction with sulfoniumsulfonium catalysis

Examples

Examples of “sulfonium” in a Sentence

adjective

British English

  • The sulphonium moiety is highly reactive.
  • They studied sulphonium salt properties.

American English

  • The sulfonium moiety is highly reactive.
  • They studied sulfonium salt properties.

Usage

Meaning in Context

Academic

Used in chemistry and biochemistry research papers, textbooks, and lectures to describe a specific reactive intermediate or functional group.

Everyday

Virtually never used.

Technical

Core terminology in organic synthesis, mechanistic studies, and metabolic pathway analysis (e.g., involving S-adenosylmethionine).

Vocabulary

Synonyms of “sulfonium”

Neutral

organosulfur cation

Weak

thionium ion (archaic/rare)

Vocabulary

Antonyms of “sulfonium”

sulfonate anion

Watch out

Common Mistakes When Using “sulfonium”

  • Confusing it with 'sulfone' (a different sulfur-containing functional group).
  • Misspelling as 'sulphonium' in American texts or 'sulfonium' in British texts.

FAQ

Frequently Asked Questions

No, it is a highly specialized technical term used almost exclusively in chemistry and biochemistry.

A sulfonium ion (R3S+) is a trivalent, positively charged sulfur species. A sulfoxide (R2S=O) is a divalent, neutral sulfur species with a double bond to oxygen.

No, it is solely a noun (referring to an ion or a class of compounds).

Use 'sulfonium' for American English contexts and 'sulphonium' for British English contexts, following the general sulfur/sulphur spelling rule.

A positively charged ion (cation) containing a central sulfur atom bonded to three organic groups.

Sulfonium is usually technical/scientific in register.

Sulfonium: in British English it is pronounced /sʌlˈfəʊnɪəm/, and in American English it is pronounced /sʌlˈfoʊniəm/. Tap the audio buttons above to hear it.

Learning

Memory Aids

Mnemonic

Think: 'SULfur' atom with a positiONIUM charge = SULFONIUM.

Conceptual Metaphor

A central hub (sulfur) with three spokes (organic groups), carrying a positive 'charge' of responsibility.

Practice

Quiz

Fill in the gap
The key methyl donor in many biochemical processes, S-adenosylmethionine, contains a reactive centre.
Multiple Choice

In which field is the term 'sulfonium' primarily used?

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