期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 23, 页码 13021-13028出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202102701
关键词
[6]cycloparaphenylene; aromatic belt; fluoren[3]arene; intramolecular aryl– aryl coupling; macrocycles
资金
- National Natural Science Foundation of China [22031010, 21772205, 21521002]
An efficient method for the synthesis of C(sp3)-bridged [6]cycloparaphenylenes (C[6]CPPs) from fluoren[3]arenes (F[3]As) has been developed, resulting in the synthesis of a new type of macrocyclic arenes. C[6]CPPs exhibit rigid belt-shaped structures and can be selectively methylated to produce fully outer-methyl-substituted derivatives. This research also obtained an unclosed belt with narrow energy gaps and strong fluorescence property, offering potential for the design and synthesis of new aromatic belts.
An approach to the highly efficient synthesis of C(sp3)-bridged [6]cycloparaphenylenes (C[6]CPPs) from fluoren[3]arenes (F[3]As) was developed. Consequently, F[3]As as a new kind of macrocyclic arenes were synthesized. Followed by the demethylation, triflation and intramolecular aryl-aryl coupling reactions, C[6]CPPs were then conveniently obtained. Interestingly, C[6]CPPs could be selectively methylated to produce their fully outer-methyl-substituted derivatives. The crystal structures showed the hydroxyl-substituted F[3]As had bowl-shaped conformations, and the C[6]CPPs exhibited rigid belt-shaped structures with deep cavities. Moreover, C[6]CPPs exhibited high HOMO energies and narrow energy gaps. An unclosed belt was further obtained, and it not only showed a similar narrow energy gap to those of the aromatic belts, but also displayed strong fluorescence property, which can play a vital role in the design and synthesis of new aromatic belts.
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