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Easy as π: A stable nonaromatic heteroporphyrin bearing a thienopyrrole moiety has been prepared. The nonaromatic nature of this compound is clearly evident based on UV/Vis absorption, 1H NMR spectroscopy, and theoretical calculations. Single-crystal X-ray analysis demonstrates that the molecule adopts a planar conformation with clear alternation in the CC bond lengths around the periphery of the macrocycle.
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Chang et al. (2012) studied this question.
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