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Chemistry LibreTexts

Physical Organic Chemistry

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    • Woodward-Hoffmann rules
      Electrocyclic reactions. The selection rule of electrocyclization reactions is given in the original statement of the Woodward–Hoffmann rules. If a generalized electrocyclic ring closure occurs in a polyene of 4n π-electrons, then it is conrotatory under thermal conditions and disrotatory under photochemical conditions.