Modification of the upper rim of homooxacalix[3]arenes and complexation between a nitrohomooxacalix[3]arene derivative and n-hexylamine.

Several functional groups were introduced on the upper rim of (lower rim free) homooxacalix[3]arene for the first time. The swinging nitrohomooxacalix[3]arene host 1 was fixed in the cone conformation by complexation with n-hexylamine.