Condensation of 3,6-diformylpyridazine with 1,3-diaminopropane in the presence of lead(II) template ions gives the first example of a macrocycle containing pyridazine-diimine head units, and only the second example of a [4 + 4] Schiff base macrocycle; the structure of [Pb2(4 + 4)](ClO4)4, 1, is described.
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Brooker et al. (1994) studied this question.
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