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The syntheses of tetra-tetrazole macrocycles containing at least one 2,6-bis(tetrazole)pyridine unit, linked by a variety of n-alkyl (n = 3, 5, 7 or 9 carbon atoms) chain lengths, are described. There has been no previous incorporation of the pyridine moiety into a tetra-tetrazolophane macrocycle. The crystal structure of one such tetra-tetrazole macrocycle has also been structurally characterised and revealed a bowl-shaped conformation.
Fleming, A., Gaire, J., Kelleher, F., McGinley, J., McKee, V.: Synthesis and Characterisation of Macrocycles Containing both Tetrazole and Pyridine Functionalities. Tetrahedron,vol. 67 (8), 6 May 2011,p.3260–3266