The acid-catalyzed condensation of 2-propylresorcinol with formaldehyde diethyl acetal. The formation and isomerization of calix[4]resorcinarene, calix[5]resorcinarene, and calix[6]resorcinarene

Add time:07/19/2019    Source:sciencedirect.com

The title reaction initially produced a mixture of three cyclic oligomers, calix[n]resorcinarenes (n= 4, 5, 6), as the major products. Under the conditions of their formation, the pentamer rapidly isomerized to the tetramer and the hexamer, while the hexamer slowly isomerized to the tetramer. A new cyclic oligomer, calix[5]resorcinarene, was isolated and characterized.

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