The dicaesium salts of pyridine-3,5-dicarboxylic acid and of the benzene dicarboxylic acids react with the dibromides derived from a variety of polyethylene glycols to afford macrocyclic bislactones.
O. Piepers and R. M. Kellogg, J. Chem. Soc., Chem. Commun., 1978, 383 DOI: 10.1039/C39780000383
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