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other active intermediates reactive toward different substrates. Thus,
formed from is the source o f
hydroxocobaloxime(III), and of oxocobaloxime(IV), The
complex is capable of both H-atom and electron abstraction, both
possibilities being feasible routes for oxidative dehydrogenations. Oxygen
insertion reactions were in some cases interpreted in terms of transient
oxocobaloxime(IV).
The formation routes and reactions of these active oxygen species are
summarized below.
Dioxygen complex formation
Oxidative dehydrogenation
where
is
or
and
is a free radical.
Electron and proton transfer
Oxygen insertion
where S is
, RNC, or PhNO.
4.1 Oxidation of
o
-phenylenediamine
The cobaloxime(II) derivatives and
where is dimethylglyoxime, are catalysts for the oxidation of
o-
phenylenediamine (OPD) by atmospheric at ambient temperature
63
. In
acetone, methyl ethyl ketone or cyclohexanone as solvents, cyclization to
2,2-disubstituted
dihydrobenzimidazoles
(DHB)
is
followed
by
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