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Synproportionation or comproportionation is a concept in chemistry and is a redox reaction where two reactants that share an atom but differ in oxidation number react to a single reaction product.


  • Potassium permanganate contains manganese with oxidation number of +7 and reacts with a manganese compound having oxidation number +2 to Manganese(IV) oxide (manganese dioxide) with oxidation number +4, potassium hydroxide and water.
  • In chalcogen chemistry 15Se + SeCl4 + 4AlCl3 -> Na[AlCl]4 + 3Se8[AlCl4]2. [1]
  • In volcanic eruptions, the redox reaction 2H2S(g) + SO2(g) -> 3S(s) + 2H2O(g).

It is the chemical opposite to disproportionation, where two or more atoms originally having the same oxidation state react with other chemical(s) to give ions with different oxidation numbers.


  • Translated from German Wiki original
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Synproportionation". A list of authors is available in Wikipedia.
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