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- Title
Synthesis of Optically Pure Helicene Metallocenes.
- Authors
Akiyama, Midori; Nozaki, Kyoko
- Abstract
Two types of ruthenocenes and a ferrocene coordinated by rac-9 H-cyclopenta[1,2- c:4,3- c′]diphenanthrenyl anion(s), a [7]helicene with a cyclopentadienyl moiety at the center of its skeleton, were successfully synthesized: mono-helicene ruthenocene 1 and its iron analogue 1Fe with one [7]helicene ligand bound to the central metal, and bis-helicene ruthenocene 2 with two [7]helicenes. Starting from a racemic mixture of the ligand precursor, rac- 2 and meso- 2 were obtained in a 7:3 ratio. Since the [7]helicene has a high racemization barrier, enantiomers of the complexes were isolated in their pure forms; they showed large optical rotations and intense circular dichroism (CD) responses.
- Subjects
CHEMICAL synthesis; METALLOCENES; HELICENES; FERROCENE; LIGANDS (Chemistry); ENANTIOMERS
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 8, p2072
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201611488