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Synproportionation

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.

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Examples:

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.