SN2 reaction

The SN2 reaction

The SN2 reaction is a single-step displacement of a leaving group by a nucleophile. During the transition state, the bond to the nucleophile forms at the same time that the bond to the leaving group breaks. Therefore the nucleophile is required to approach from the back, and configuration at carbon is inverted.

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Reaction animation:
animated GIF

SN1 SN2 E1 E2
listed by Intute