Woodward–Hoffmann rules
Electrocyclic reactions

Woodward–Hoffmann rules

Section Title: Electrocyclic reactions
Table Section Text: None

Thermally allowed	Photochemically allowed

4n	conrotatory	disrotatory

4n + 2	disrotatory	conrotatory

Sentence(s)

The 4n-electron thermal and (4n + 2)-electron photochemical electrocyclic reactions were conrotatory, while 4n-electron photochemical and (4n + 2)-electron thermal electrocyclic reactions were disrotatory.

final_sentence: The 4n-electron thermal and (4n + 2)-electron photochemical electrocyclic reactions were conrotatory, while 4n-electron photochemical and (4n + 2)-electron thermal electrocyclic reactions were disrotatory.