Disproportionation

Disproportionation

Any chemical reaction of the type A + A → A' + A", where A, A' and A" are different chemical species. For example:

2 ArH⁺ → ArH + ArH²⁺

The reverse of disproportionation is called comproportionation.

A special case of disproportionation (or "dismutation") is "radical disproportionation", exemplified by

^.CH₂CH₃ + ^.CH₂CH₃ → CH₂=CH₂ + CH₃CH₃

Reactions of the more general type

RC^.HCH₃ + R'C^.HCH₃ → RCH=CH₂ + R'CH₂CH₃

are also loosely described as radical disproportionations.

(A somewhat more restricted usage of the term prevails in inorganic chemistry.)

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Part of Speech: noun
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Industry/Domain: Chemistry
Category: Physical organic chemistry
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