| Autor: |
Ryuichi Mori, Misa Satake, Shoko Kikkawa, Isao Azumaya, Yuuki Saito, Hidemasa Hikawa, Misaki Okayasu, Ryoko Sakagami |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
RSC Advances. 10:34549-34555 |
| ISSN: |
2046-2069 |
| Popis: |
Calix[3]aramide-based macrocycles 1 were successfully synthesized by a Glaser coupling reaction of two meta-calix[3]aramide moieties that have three ethynyl groups. The obtained macrocycles have stereoisomers: an enantiomeric pair and a meso form based on a combination of amide bond directions in the calix[3]aramide moieties at both ends of the molecule. Characteristic absorption spectra derived from the 1,4-diphenylbutadiyne structure were observed, while their ECD spectra were mirror-images. Single-crystal X-ray analysis revealed that each stereoisomer had a cylindrical rigid shape, and the absolute structure of the chiral-form was also assigned by comparing the Flack parameters. Mirror-image VCD spectra were observed for the enantiomeric chiral forms, and a VCD signal pattern of one enantiomer corresponded to that predicted by the relationship between the dihedral angle of the pair of CO groups. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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