The reaction of isobutene with 1,12-dodecanedioic dichloride in the presence of aluminium chloride leads to a dimeric pyrylium salt (I), though by modifying the conditions of the reaction a mixture is obtained which, after amminolysis, gives mainly the monomeric [10]-(2,6)-pyridinophane (II).
U. K. Georgi and J. Rétey, J. Chem. Soc. D, 1971, 32 DOI: 10.1039/C29710000032
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