Applied Organometallic Chemistry,
Journal Year:
2024,
Volume and Issue:
38(3)
Published: Jan. 26, 2024
Diastereoselective
epoxidation
of
R
‐(+)‐limonene
using
achiral
and
racemic
dimeric
Salen‐Mn
(III)
complexes
as
catalysts
((
1a)
(
1b)
)
in
situ
generated
dimethyldioxirane
(DMDO)
an
oxidizing
agent
was
explored.
The
best
reaction
parameters
were:
i
KHSO
5
/
molar
ratio
=
0.25;
ii
‐(+)‐limonene,
catalyst
20,
iii
absence
nitrogenous
bases
(axial
ligands),
iv
ambient
temperature
(20°C),
v
catalyst,
vi
low
amount
acetone
(4
mL).
Under
these
conditions
isolated
yield
to
1,2‐(+)‐limonene
oxide
diastereomeric
excess
d.e
),
d.y.e
major
diastereomer
cis
‐epoxide)
96%,
77%,
72%,
respectively.
Moreover,
the
segregated
into
a
solid
phase,
while
products
remained
liquid
allowing
easy
separation
products.
Consequently,
could
be
recycled
up
three
times
without
appreciable
loss
its
initial
catalytic
activity.
Inorganics,
Journal Year:
2023,
Volume and Issue:
11(8), P. 320 - 320
Published: July 28, 2023
Complexes
of
Schiff
bases
(SBs)
with
metals
are
promising
compounds
exhibiting
a
broad
range
applications,
such
as
catalysts,
polymers,
dyes,
and
several
biological
activities,
including
antimicrobial,
anticancer,
antioxidant,
antimalarial,
analgesic,
antiviral,
antipyretic,
antidiabetic
actions.
Considering
the
crisis
that
whole
world
is
now
facing
against
antimicrobial-resistant
bacteria,
in
present
review,
we
chose
to
focus
on
activity
SBs
antimicrobials,
particularly
underlying
most
recent
studies
this
field.
Finally,
some
interesting
catalytic
applications
recently
described
for
metal
complexes
have
also
been
discussed.
