Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 62, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202214769
Keywords
Chirality; Helicene; Molecular Carbon; Stereoisomers; Stereoselectivity
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In this study, a molecular carbon C-204 featuring 12-fold [5]helicenes around four cores was successfully constructed, and one pair of enantiomers with D-3 symmetry was obtained. The results suggest that choosing PDIs as building blocks can realize the stereoselectivity and chirality of molecular carbons.
Despite the great progress in research on molecular carbons containing multiple helicenes around one core, realizing the stereoselectivity of carbons containing multiple helicenes around more cores is still a great challenge. Herein, molecular carbon C-204 featuring 12-fold [5]helicenes around four cores was successfully constructed by using nine perylene diimide (PDI) units, and exhibits good solubility and stability. Despite 256 possible stereoisomers caused by the 12-fold [5]helicenes, we only obtained one pair of enantiomers with D-3 symmetry. There are four possible pairs of enantiomers with D-3 symmetry, namely 7A, 7B, 7C and 7D. Theoretical and experimental results verify that the obtained structure belongs to 7C, which has the lowest energy. The enantiomers can also be separated by chiral HPLC. These results suggest that choosing PDIs as building blocks can not only improve the solubility and stability but also realize the stereoselectivity and chirality of molecular carbons.
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