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Mono-6-O-acylated cycloinulohexaoses 1 and mono-6-O-alkylated cycloinulohexaoses 2 were prepareds by the reaction of cycloinulohexaose with long-chain acyl chlorides and long-chain alkyl bromides, respectively. These amphiphilic cycloinulohexaoses showed good water solubilities. The critical micelle concentration (cmc) of each amphiphilic compound, which was determined by a dye method, decreased along with an increase in the alkyl chain length. The micelle-forming ability of compound 2 was higher than that of compound 1 bearing the same carbon number in the hydrophobic part. The aggregation numbers of mono(6-O-tetradecanoyl)cycloinulohexaose 1b and mono(6-O-tetradecyl)cycloinulohexaose 2b, which were obtained with fluorescence measurements, were 4.8 and 6.5, respectively. The cmcs of compounds 1b and 2b were increased by the addition of either KCl, RbCl, or BaCl2, though they were decreased by the addition of LiCl or NaCl. These results indicate that compounds 1b and 2b complex with K+, Rb+, or Ba2+ in water, but negligibly with Li+ or Na+.

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