This article describes one-step synthesis of a singly bridged biscalix[6]arene (2) and evaluation of its recognition properties towards alkali metal ions for the first time. Synthesis of 2 was accomplished through coupling of two 4-tert-butylcalix[6]arene units with one molecule of diethyleneglycol ditosylate. Both base and linker were found to play a role in the outcome of coupling reaction for the simple and efficient synthesis of 2. Complexation ability of 2 was studied by liquid-liquid extraction using alkali metal (Na Carrier activity of 2 towards the facilitated transport of alkali metal ions across a bulk liquid membrane was also studied and the transport behaviour was mechanistically explained. The predominant role of an ion exchange action mechanism in the transport process was observed.
O-methylation of p-tert-butylcalix[6]arene with methyl p-tosylate in acetonitrile under limiting conditions of base and electrophile has been investigated, which led to isolation of all twelve O-methylated derivatives from the reaction mixture. Previously unreported direct single step syntheses of (1,2,4-tri)-, (1,2,3,4-tetra)-and (1,2,3,5-tetra)-O-methylated derivatives from p-tert-butylcalix[6]arene have been achieved in this study and are reported here for the first time.
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