An unambigous route from o-aminophenol to dibenzo-crowns with two secondary amine links is reported. Some new mono- and di-nitrogen-containing monobenzo-crowns have also been prepared. The simple mononitrogencontaining crowns can be modified by N-substitution, with, for example, a pendant donor group, sufficiently flexible to co-ordinate to metals held in a polyether ring.
J. C. Lockhart and M. E. Thompson, J. Chem. Soc., Perkin Trans. 1, 1977, 202 DOI: 10.1039/P19770000202
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