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Chiroptical properties of carbo[6]helicene derivatives bearing extended π-conjugated cyano substituents.

Abstract : New carbo[6]helicene derivatives grafted with π-conjugated cyano-phenyl arms were synthesized in enantiopure forms and their π-conjugation examined by UV-vis spectroscopy. The influence of the π-conjugation on the circular dichroism spectra and molar rotations is discussed based on comparing experimental data with results from quantum-chemical calculations. The results highlight the fact that increasing the spatial extension of the π-system in a helicene molecule is an efficient way of increasing its molar rotation.
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Mehdi El Sayed Moussa, Monika Srebro, Emmanuel Anger, Nicolas Vanthuyne, Christian Roussel, et al.. Chiroptical properties of carbo[6]helicene derivatives bearing extended π-conjugated cyano substituents.. Chirality, Wiley, 2013, 25 (8), pp.455-465. ⟨10.1002/chir.22201⟩. ⟨hal-00878615⟩

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