disproportionation
Also contains definition of: radical disproportionation
Synonym: dismutation
-
Any chemical reaction of the type
,
where A, A' and A'' are different chemical species. For example:
The reverse of disproportionation is called comproportionation. A special case of disproportionation (or 'dismutation') is 'radical disproportionation', exemplified by:
Reactions of the more general type:
are also loosely described as radical disproportionations.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1107
The following somewhat more restricted usage of the term prevails in inorganic chemistry.
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
1994))
on page 581
-
A reversible or irreversible transition in which species with the same oxidation state combine to yield one of higher oxidation state and one of lower oxidation state. Example:
The term also applies to an internal oxidation-reduction process as occurs, for example, among the iron atoms of
CaFeO3,
where
,
at Fe subarrays on lowering the temperature.
Source:
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
1994))
on page 581
Reactions of the more general type:
are also loosely described as radical disproportionations.
Source:PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1107The following somewhat more restricted usage of the term prevails in inorganic chemistry.PAC, 1994, 66, 577 (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 581