On treatment with caesium carbonate various dihydric phenols as well as salicylic acid are transformed into their dicaesium salts, which on reaction with dibromopolyethylene glycols afford crown ethers.
B. J. van Keulen, R. M. Kellogg and O. Piepers, J. Chem. Soc., Chem. Commun., 1979, 285 DOI: 10.1039/C39790000285
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