Definition of carbonium ion in English:

carbonium ion

Syllabification: car·bo·ni·um i·on
Pronunciation: /kärˌbōnēəm ˈīˌän
 
/

noun

Chemistry
An organic cation in which the positive charge is located on a carbon atom.
More example sentences
  • The key step in a unimolecular reaction is the formation of the carbon cation, or carbonium ion, by the departure of the leaving group.
  • This paper reviews the concept of carbonium ions, their formation, stability and reactions.
  • If a carbonium ion is involved in lysozyme catalysis then the TS structure will involve a planar, sp-hybridized C - 1.

Origin

early 20th century: carbonium from carbo- 'carbon', on the pattern of ammonium.

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