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• W2012331753 startingPage "809" @default.
• W2012331753 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 helix-dimers in solution as were ethynylhelicene oligomers. The helix-dimer of the amidohelicene octamer in chloroform was very stable, and did not dissociate at 5 × 10−8 M on heating to 60 °C. The dissociation of the amidohelicene oligomers to random-coil state took place in hydrogen-bonding breaking solvents, DMSO or THF. The equilibrium between helix-dimer and random-coil changed by varying the ratio in the mixed solvents of chloroform and DMSO. Notably, the equilibriums were not affected by temperature for various mixtures of helix-dimer and random-coil. Thus, the sensitivity toward the environment was quite different between the amido- and ethynylhelicene oligomers." @default.
• W2012331753 created "2016-06-24" @default.
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• W2012331753 date "2010-07-15" @default.
• W2012331753 modified "2023-10-14" @default.
• W2012331753 title "Synthesis and Thermally Stable Helix-Dimer Formation of Amidohelicene Oligomers" @default.
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• W2012331753 doi "https://doi.org/10.1246/bcsj.20100041" @default.
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