Diels–Alder reactions of 15–21 membered quinocrown ethers 1a–c with cyclopentadiene have been accelerated by the addition of alkali, alkaline-earth, and scandium perchlorates, reflecting the selective cation-binding abilities of crown ethers.
A. Tsuda and T. Oshima, New J. Chem., 1998, 22, 1027 DOI: 10.1039/A805326J
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