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The addition of lithium aryls 3 to 1,10‐phenanthroline ( 2 ), functionalization of the rearomatized bisadduct 8b to the tetraphenol 8d , and cyclization of 8d with two equivalents of an α,ω‐ditosylate 9 led to a highly symmetrical, conformer‐free bimacrocyclic 1,10‐phenanthroline 10a in which the basic and coordinating region possesses a concave shielding.
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Lüning et al. (1990) studied this question.
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