Selective nitration of tetraphenylporphyrin (TPP) and its derivatives is reported. The reaction of meso-aryl substituted porphyrins with fuming yellow nitric acid (d = 1.53) at the temperature 0–20°C results in the formation of 5,10-bis(4-nitroaryl)-15,20-diarylporphyrins with yields of 30–83%.
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Ostrowski et al. (2003) studied this question.
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