A Low-cost Manganese Complex Catalyst for Phenolic Coupling and Further Oxidation of Phenols
Binuclear manganese (Mn) complexes have been prepared as selective oxidants. Here, the oxidative
coupling of phenols under manganese (Mn)-catalyzed conditions were described to form biphenols,
ortho-quinones and benzoxepines. Manganese(III) picolinate (Mn (III) (PIC)3 H2O, complex (1) is used as
a low- cost and easy to prepare catalyst which activates by periodic acid and some organic substrates can
be oxidized after the activation process proposing that the manganese is converted to a higher oxidation
state. In this study, catalytic oxidation reactions from a mononuclear Mn complex can be used to perform
manganese catalysis that usually requires a binuclear complex. The formation of biphenols was
successfully determined by using 1HNMR.
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