Abstract
The cyclic hexamer obtained by the condensation of furan and acetone can be used as a convenient starting material for the syntheses of calix[6]pyrrole 1 and of several “hybrid systems” containing both furan and pyrrole units. The solid-state structure of 1 shows a water molecule held inside the cavity by six hydrogen-bonding interactions, while that of the “alternating” calix[3]furan[3]pyrrole 2 contains no water molecules, despite the macrocycles having a similar structure.
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