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Frontier Orbitals Aromaticity: A Simple Approach to the Analysis of Pericyclic Reactions†

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Dedicated to Professor H. Firouzabadi, one of the founders of Ph.D. program in organic chemistry in Iran on the occasion of his 65th birthday and also his retirement. A new and simple approach to the analysis of pericyclic reactions based on combination of the interaction of HOMO-LUMO molecular orbitals and Huckel-Mobius aromaticity concept in transition state is reported. This approach seems to be more powerful than the Woodward-Hoffmann approach which appears to be limited to reactions with sufficiently high symmetry, and the Huckel-Mobius that use the non-participating lowest basis set (ط1). One important impact of the current approach is its capability in addressing the photochemical concerted reactions.

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