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Is the [9]Annulene Cation a Möbius Annulene?

✍ Scribed by Götz Bucher; Stefan Grimme; Robert Huenerbein; Alexander A. Auer; Eva Mucke; Felix Köhler; Jan Siegwarth; Rainer Herges

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
411 KB
Volume
48
Category
Article
ISSN
0044-8249

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## Abstract The twofold vinylogously enlarged porphyrin with a 22‐π‐electron system 3 was prepared by vinylogous bisformylation of the dipyrrylmethane 7 to give 8 and subsequent acid‐catalyzed condensation of 8 with 7. The [22]porphyrin 3 is characterized by a Soret band at 469 nm, which on protona