Synthesis and Thermally Stable Helix-Dimer Formation of Amidohelicene Oligomers

R Amemiya, W Ichinose, M Yamaguchi

Index: Amemiya, Ryo; Ichinose, Wataru; Yamaguchi, Masahiko Bulletin of the Chemical Society of Japan, 2010 , vol. 83, # 7 p. 809 - 815

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Citation Number: 15

Abstract

Optically active amidohelicene monomer to nonamer were synthesized in high yields by a two-directional method. The CD spectra in chloroform exhibited a large difference between dimer and the higher homologs, and vapor pressure osmometry studies revealed the formation of dimeric aggregates for the latter. It is noted that amidohelicene oligomers possessing two-atom linking groups between helicene and m-phenylene spacer formed ...