Jf. Bartoli et al., New manganese beta-polynitroporphyrins as particularly efficient catalystsfor biomimetic hydroxylation of aromatic compounds with H2O2, CHEM COMMUN, (10), 2000, pp. 827-828
A series of Mn porphyrins bearing one to eight beta-nitro substituents were
synthesized in high yield in three steps by using a new general method for
selective nitration of a Zn(meso-tetraarylporphyrin); this Mn porphyrin se
ries exhibits a remarkably wide span of Mn(III)/Mn(II) redox potentials fro
m -290 to + 1150 mV (vs. SCE), and the Mn porphyrins bearing one to five be
ta-nitro groups are particularly good catalysts for hydroxylation of aromat
ic compounds with H2O2, with yields up to 98, 83, 80 and 12%, respectively
for anisole, naphthalene, acetanilide and ethylbenzene.