N.W. Smith, et al., “Efficient Nitration of Meso-Tetraphenylporphyrin with Nitronium Tetrafluoroborate,” ARKIVOC, 2010, 7, 10-18. (commemorative issue in honor of Prof. Richard A. Bartsch)

Abstract: Controllable and selective nitration of meso-tetraphenylporphyrin using nitronium tetrafluoroborate affords a chromatography-free access to mono-, bis- and tris(4-nitrophenyl)porphyrins in high yields.