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A pericyclic reaction is a reaction in which bonds are formed or broken at the termini of one or more conjugated π systems. The electrons move around in a circle, all bonds are made and broken simultaneously, and no intermediates intervene. The requirement of concertedness distinguishes pericyclic reactions from most polar or free-radical reactions, although for many pericyclic reactions reasonable alternative stepwise mechanisms can also be drawn.
KeywordsClaisen Rearrangement Sigmatropic Rearrangement Pericyclic Reaction Stereochemical Result Cope Rearrangement
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