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Eun Ju Kim1, Hye Ri Yang, Sang Jo Lee

  • 1Department of Physics, Yeungnam University, Kyongsan 712-749, Korea.

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|October 30, 2008
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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