| Abstract
| - Torquoselectivity in the electrocyclic interconversions of 1-azapolyenes and their heterocyclic isomerswas investigated theoretically. The ring openings of 1,2-dihydroazete, 1,2-dihydropyridine, and 1,2-dihydroazocine were examined using HF, MP2, and B3LYP calculations. A large preference forinward rotation of the nitrogen lone pair and outward rotation of the N−H group was found forthe four- and six-electron systems. No strong preference was observed for the eight-electron system.
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