prepared by the reaction of muconic acid dichloride with diols containing a polyether linkage. The 1,3-diene moiety was complexed by iron carbonyl to furnish macrocycles bearing a (η4-diene)tricarbonyliron moiety. The structures of the macrocycles were determined by NMR and IR spectroscopy, and by X-ray structural analysis. The macrocycles formed complexes with some ammonium salts and their association