Molecular modification and function of higher crown ethers

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Partially unsaturated thiacrown ethers, which had saturated bonds and unsaturated bonds mutually and hydroxyl groups, and benzene-fused thiacrown ethers, which possessed saturated bonds or unsaturated bonds, were synthesized. Fundamental properties of the thiacrown ethers, such as absorption spectra and oxidation behaviors,were studied, and difference of the properties among the macrocycles with different ring-size was clarified. The relationship between flexibility and inclusion behavior was also examined.