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Single-crystal X-ray analysis has shown the formaldehyde and para-t-butylphenol and its ability to tetrameric structure of the low melting point product obtained from the base catalysed condensation of form a stable cage-type clathrate with toluene.

Capping of p -t -butyl-calix [4]arene (1 a) with pentaethylene glycol ditoluene-p-sulphonate and ButOK in benzene leads to the first member of a new class of macrobicyclic crown compounds (2), which possess two cavities (one hydrophilic and one lypophilic) and two additional, ionizable binding sites.

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C( 1 2 y C(13"') C(14"') C(15'")

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