A series of Mn porphyrins bearing one to eight β-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 series exhibits a
remarkably wide span of Mn(III)/Mn(II) redox
potentials from â290 to + 1150 mV (vs. SCE), and the Mn
porphyrins bearing one to five β-nitro groups are particularly good
catalysts for hydroxylation of aromatic compounds with
H2O2, with yields up to 98, 83, 80 and 12%,
respectively for anisole, naphthalene, acetanilide and ethylbenzene.
通过使用一种新的选择性硝化Zn(介四芳基
卟啉)的通用方法,分三步高产合成了一系列带有1到8个δ-硝基取代基的
锰卟啉。含一至五个δ-硝基的
锰卟啉是用
H2O2 对芳香族化合物进行羟基化反应的理想催化剂,对
苯甲醚、
萘、
乙酰苯胺和乙苯的催化收率分别高达 98%、83%、80% 和 12%。