Shape-persistent, double-helically twisted macrocycles with two quaterphenyl moieties: Synthesis, structure and physicochemical properties for a chiral sensor - 24/02/09
, Yoko Daifuku, Yasukazu Hirao, Kouzou Matsumoto, Hiroyuki Kurata, Takashi Kubo| pages | 9 |
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Abstract |
Shape-persistent macrocyclic diene and diyne, which consist of two quaterphenyl units, were synthesized by McMurry coupling of 5,5′-bis(3-formylphenyl)-2,2′-dimethoxybiphenyl as a key step. The macrocycles have achiral (meso) and chiral (racemic) conformational isomers owing to two asymmetric axes of the biaryl units. According to the theoretical calculations, the chiral conformers are about 1kcalmol−1 lower than the corresponding achiral conformers in energy. The NMR spectra indicate that the interconversion between the diastereomers occurs with relatively low energy barrier (<10kcalmol−1). An X-ray crystallographic analysis of the diyne reveals that it has a double-helically twisted chiral structure and low strain nature of the molecule as expected. Moreover, the molecules construct a layered structure with channels that are filled with two chloroform molecules. Potential utilities such as a chiral sensor were also investigated.
Le texte complet de cet article est disponible en PDF.Keywords : Macrocycle, Double-helically twisted structure, Channel structure, Chiral sensor
Plan
Vol 12 - N° 3-4
P. 403-411 - mars 2009 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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