Replacement of alkaline earth metal ions from a conjugated hexadentate nitrogen analogue of [18]-annulene by some first row transition metal ions significantly smaller than the macrocycle cavity is accompanied by an intramolecular ring contraction yielding a 15-membered quinquedentate macrocycle of improved fit; the X-ray crystal structure of the cobalt complex has been determined.
S. M. Nelson, F. S. Esho, M. G. B. Drew and P. Bird, J. Chem. Soc., Chem. Commun., 1979, 1035 DOI: 10.1039/C39790001035
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