期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202202682
关键词
aromaticity; conformational change; expanded porphyrin; hydrodebromination; topology
资金
- JSPS KAKENHI [JP20K05463, JP21H05480]
- JSPS [20J20954]
A meso-free beta-bromodecaphyrin and a beta-unsubstituted meso-free [46]decaphyrin were synthesized. The [46]decaphyrin exhibits distinct aromaticity and flexible conformational change.
A meso-free beta-bromodecaphyrin has been constructed by [2+3+2+3] type acid-catalyzed cross-condensation and subsequent oxidation. Hydrodebromination of this tetrabromodecaphyrin with NaBH4 in the presence of TMEDA and palladium catalyst afforded beta-unsubstituted doubly meso-free [46]decaphyrin(1.1.1.1.1.1.1.1.1.1) as the first example of beta-unsubstituted meso-free regular expanded porphyrins with the number of pyrrole units larger than eight. It exhibits distinct aromaticity originating from its 46 pi-conjugated electronic circuit and flexible conformational change between non-twisted and doubly twisted forms depending on the solvent-polarity. Their distinct conformations have been analyzed by combined experimental and theoretical investigations.
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