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Cyclobishelicenes: Shape-Persistent Figure-Eight Aromatic Molecules with Promising Chiroptical Properties

2019-08-09

Description : Cyclobis[n]helicenes (n = 3 or 5) are chiral D2-sym- metric p-conjugated macrocycles with stable lemniscular, or figure-eight, shapes. The conformational analysis of five dif- ferent cyclobis[n]helicenes revealed that these molecules can only exist as their lemniscular conformers with high barriers to enantiomerization (> 200 kJ/mol). The enantiomers of a cyclobis[5]helicene were resolved by HPLC and their un- usual chiroptical properties were attributed to the inherent chirality of their macrocyclic figure-eight.
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https://medihal.archives-ouvertes.fr/hal-02332131
Contributeur : Gaelle Chouraqui <>
Soumis le : jeudi 24 octobre 2019 - 16:18:36
Dernière modification le : lundi 4 novembre 2019 - 09:22:04