Synthesis of ‘crown ether’ macrocyclic bislactones using caesium carboxylates of pyridine and of benzene dicarboxylic acids

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Abstract
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.