Abstract
The selective nitration of meso -tetraphenylporphyrin complexes is described. The reaction of the above porphyrinates
with 25% HNO3 or 5% HNO3 at room temperature or 0-5 °C, respectively, results in the formation of the corresponding
mono β-nitroporphyrins (56-81%), accompanied by small amounts of a mixture of β,β-dinitro
by-products. The results described above are the first known examples of β-mononitration
of meso -tetraarylporphyrin complexes under electrophilic conditions. Reactions with nickel(II),
copper(II), and cobalt(II) porphyrinates are discussed.
Key words
porphyrin complexes - electrophilic aromatic nitration - dimerization
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