The synthesis of furan-derived calixarenes

Abstract
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.

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