期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 63, 页码 14364-14369出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902637
关键词
aromatic compounds; chirality; chiroptical properties; conformation analysis; helical structures
Cyclobis[n]helicenes (n=3 or 5) are chiral D-2-symmetric pi-conjugated macrocycles with stable lemniscular, or figure-eight, shapes. The conformational analysis of five different cyclobis[n]helicenes revealed that these molecules can only exist as their lemniscular conformers with high barriers to enantiomerization (>200 kJ mol(-1)). The enantiomers of a cyclobis[5]helicene were resolved by HPLC and their unusual chiroptical properties were attributed to the inherent chirality of their macrocyclic figure-eight.
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