Abstract
The Woodward-Hoffmann rule and Fukui's Frontier orbital theory are based on two rather different concepts, yet the two selection rules generally yield consistent conclusions concerning the feasibility of a concerted reaction. This paper suggests that their consistency can be understood in terms of the HOMO-HOMO interaction. First, one can show that the result of the HOMO-HOMO interaction reinforces that of the HOMO-LUMO interaction. Therefore it can be viewed that the HOMO-HOMO interaction is actually taken into account implicitly when the selection rule based solely on the HOMO-LUMO interaction is applied. Secondly, one can make an explicit interpretation of the Woodward-Hoffmann scheme in terms of the HOMO-HOMO interaction.
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