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A new route to tetrabenzoporphyrins from the closest possible precursor of the unstable isoindole was developed. A key feature of this route is a dramatic facilitation of thearomatization of annelated rings, which is the most serious bottleneck in previous syntheses of tetrabenzoporphyrins. The capabilities of the new method are illustrated by the synthesis of meso ‐tetraaryltetrabenzoporphyrins, as well as the first unambiguous synthesis and characterization of 5,15‐diphenyltetrabenzoporphyrin.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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Filatov et al. (2007) studied this question.
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