Metallacrown ethers of the type [PdX2{Ph2P- (CH2CH2O)4CH2CH2PPh2-P,P′}]m (X = Cl, I) exhibit a unique and reversible mode of molecular recognition in which PdX2 units are incorporated into the metallacrown ether ring via a ring-expansion reaction to form dimetallacrown ethers.
D. C. Smith Jr., C. H. Lake and G. M. Gray, Chem. Commun., 1998, 2771 DOI: 10.1039/A807170E
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