Biscavitands II: Self-inclusion in a back-to-back connected biscavitand

초록

A foot-to-foot or 'back-to-back' connected biscavitand is prepared directly from a hexadecol resorcinarene precursor. The axial orientation of the biphenyl linker and hence the crown conformation of the hexadecol was established by an X-ray crystal study of the biscavitand. Each cavitand bowl is filled in the crystal by an alkyl 'foot' from the next molecule, a self-inclusion which results in polymeric host-guest chains. The new biscavitand differs from previously prepared Z and C isomers of a bowl-to-bowl or 'front-to-front' connected host, which crystallize as chains of carcerand-like, solvent-filled cages or as distinct molecules of hemicarceplex, respectively.

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