Collect. Czech. Chem. Commun. 2006, 71, 1256-1264
https://doi.org/10.1135/cccc20061256

Modified Synthesis of Heptahelicene and Its Resolution Into Single Enantiomers

Zuzana Alexandrováa, Petr Sehnala, Irena G. Staráa,*, Ivo Starýa,*, David Šamana, Stephen G. Urquhartb and Edwige Oterob

a Center for Biomolecules and Complex Molecular Systems, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
b Department of Chemistry, University of Saskatchewan, Saskatoon SK S7N 5C9, Canada

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16. Optical rotation of (–)-(M)-6 published by Martin (ref.10, [α]57925 –5900 ± 200, c 0.06, CHCl3) is substantially higher than the value measured by us, despite the fact that we repeatedly checked the purity of (–)-(M)-6 (purified by HPLC or recrystallized from heptane) by 1H NMR and 13C NMR and enantiopurity by HPLC on a chiral column. The CD spectrum was in full agreement with the literature data.