
Comproportionation or symproportionation is a chemical reaction where two reactants, each containing the same element but with a different oxidation number, will form a product in which the elements involved reach the same oxidation number. For example, an element A in the oxidation states 0 and +2 can comproportionate to the state +1. It is oppos...
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http://en.wikipedia.org/wiki/Comproportionation

The reverse of disproportionation. The term 'symproportionation' is also used. HARTMANNS, KLENKE, and METZGER (1986).
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http://www.chem.qmul.ac.uk/iupac/gtpoc/CoCy.html
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