Two strained hexahelicenophanes

Two strained hexahelicenophanes

The crystal structures of the [6]­helicenes 4,13‐(1,10‐deca­methyl­ene­dioxy)­hexahelicene, C36H34O2, (I), and 4,13‐(1,8‐octa­methyl­ene­dioxy)­hexahelicene, C34H30O2, (II), show strong steric interactions between the terminal benzene rings and the poly­methyl­ene­dioxy chains. The shortest ring A a...

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Veröffentlicht in:Acta crystallographica. Section C, Crystal structure communications Crystal structure communications, 2000-06, Vol.56 (6), p.684-686
Hauptverfasser: Meier, Herbert, Schwertel, Manfred, Schollmeyer, Dieter
Format: Artikel
Sprache:eng
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Zusammenfassung:The crystal structures of the [6]­helicenes 4,13‐(1,10‐deca­methyl­ene­dioxy)­hexahelicene, C36H34O2, (I), and 4,13‐(1,8‐octa­methyl­ene­dioxy)­hexahelicene, C34H30O2, (II), show strong steric interactions between the terminal benzene rings and the poly­methyl­ene­dioxy chains. The shortest ring A and F distances amount to 2.941 (3) and 2.902 (3) Å, respectively. The increased steric energy of the ground state is responsible for a significantly lower racemization barrier of (I) and (II) in comparison to the unsubstituted [6]­helicene.
ISSN:0108-2701
1600-5759
DOI:10.1107/S0108270100003140