The protons on a silica or alu mina su rface can be
replaced by manganese( III) porphyrin ca tions, Mn(TPP +).
Manganesc(III) porphyrin supported on silica and alumina
can activate dioxygen in the presence of additional NaBH4
o r [NBu41rBH41 as an electron source and styrene, affording
I-phenyl ethanol and acetophenone in a 4:1 ratio. When
oxidation was applied in a mixture of benzene/ethanol,
Mn(TPP+) heterogeneous catalyst was desorpted from
silica and alumina surface. The oxidation of styrene has also
been studied in two phases systems H20/CH2CI2 in the
presence of NaBH4 and tetra-n-hutyl amonium bromide
as a phase transfer catalys t. Manganese(III) porphyrin
remained stable and major product was I - phenyl ethanol,
when dichloromethane used in the presence of catalyst
supported on alumina, the only product was I - phenyl
e thanol.