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[2、3]σ迁移是一类经由有六电子参与的五元环状过渡态(Huckel体系)而实现的分子内重排反应。该五元环可以是纯碳环,但更多见的是含一个杂原子的情形,可用如下通式表示:
[2,3] σ migration is a class of intramolecular rearrangement reactions via a five-membered cyclic transition state with six electrons (Huckel system). The five-membered ring may be a pure carbocyclic ring, but the more common one is a heteroatom-containing one, which can be represented by the general formula: