The cyclocondensation reaction between N,N-bis(2-aminoethyl)-2-phenylethylamine and 2,6-diformylpyridine in the presence of a barium template gave an unexpected 18-membered macrocyclic product in which a ring contraction at one side-arm has occurred to produce an imidazolidine ring.
H. Adams, N. A. Bailey, P. Bertrand, S. R. Collinson, D. E. Fenton and S. J. Kitchen, J. Chem. Soc., Dalton Trans., 1996, 1181 DOI: 10.1039/DT9960001181
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