Definition of elimination

The reverse of an addition reaction or transformation.

In an elimination two groups (called eliminands) are lost most often from two different centres (1/2/elimination or 1/3/elimination, etc.) with concomitant formation of an unsaturation in the molecule (double bond, triple bond) or formation of a new ring.

If the groups are lost from a single centre ([alpha]-elimination, 1/1/elimination) the resulting product is a carbene or a "carbene analogue". See also [alpha]-elimination.

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