Furan and 2-hydroxymethylfuran were reacted under Lewis acidic oligomeric precursors, for a subsequent Lewis acid catalysed cyclisation to afford the furan based calixarenes, i.e.cyclic tetramer2a, and small quantities of the cyclic pentamer2b, hexamer 2c and octamer2d.
R. M. Musau and A. Whiting, J. Chem. Soc., Chem. Commun., 1993, 1029 DOI: 10.1039/C39930001029
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