16.7 Electrocyclic Reactions

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Ring Opening and Ring Closure

e- Moving in
Transition State
Thermal Photochemical
4N + 2
(Odd # of Pairs)
Disrotatory allowed
Conrotatory forbidden
Conrotatory allowed
Disrotatory forbidden
4N
(Even # of Pairs)
Conrotatory allowed
Disrotatory forbidden
Disrotatory allowed
Conrotatory forbidden
electrocyclic reaction 01
electrocyclic reaction molecular orbitals 01
electrocyclic reaction 03
electrocyclic reaction molecular orbitals 03