Direct amination of meso-tetraarylporphyrin derivatives - Easy route to A3B-, A2BC-, and A2B2-type porphyrins bearing two nitrogen-containing substituents at the meso-positioned phenyl groups
meso-Tetraarylporphyrinato complexes 1a-g (Zn11, Cu 11, and Ni11) bearing one or two nitro-substituted aryl moieties react with 1,1,1-trimethylhydrazinium iodide in the presence of 'BuOK in THF at 0 - 5c or in t