Synthetic Communications,
Год журнала:
2024,
Номер
54(8), С. 672 - 693
Опубликована: Март 20, 2024
Polyethyleneimine-supported
cobalt
(II)
chloride
as
a
novel
polymeric
nanocomposite
acidic
catalyst
for
the
one-stage
transesterification
reaction
of
ethyl
acetate
with
various
alcohols
is
reported.
The
was
characterized
by
Fourier
transform
infrared
spectroscopy,
X-ray
powder
diffraction,
transmission
electron
microscopy,
scanning
dynamic
light
scattering
technique,
and
thermal
gravimetric
analysis.
Furthermore,
inductively
coupled
plasma
atomic
absorption
spectroscopy
were
used
to
determine
quantity
Cobalt
nanoparticles
in
catalyst.
By
adding
(0.10
g,
0.20
mol%)
n-hexane/chloroform
(5.0
cm3)
solvent
under
reflux
conditions,
studies
demonstrated
successful
reactions
excellent
yields
(80–98%)
short
times
(0.50–1.30
h)
using
substrates
on
scale
1.0
mmol.
Seven
consecutive
could
be
performed
without
significantly
decreasing
its
activity.
most
noteworthy
aspects
this
process
are
low
cost,
safety,
environmental
friendliness
due
catalyst's
non-toxicity,
straightforward
operation,
effective
outcomes.
International Journal of Environmental & Analytical Chemistry,
Год журнала:
2024,
Номер
unknown, С. 1 - 18
Опубликована: Март 14, 2024
This
study
involved
the
synthesis
of
epigallocatechin-3-gallate-Iron
(II,
III)
oxide
(EGCG-
Fe3O4)
nanocatalysts
by
reacting
Fe2O3
with
EGCG
extracted
from
green
tea
(Camellia
sinensis)
aqueous
extract.
environmentally
friendly
method
was
used
as
an
alternative
to
traditional
routes.
The
EGCG-
Fe3O4
were
characterised
using
various
techniques,
including
fourier
transform
infrared
spectroscopy
(FTIR),
ultraviolet-visible
(UV),
X-ray
diffraction
(XRD),
scanning
electron
microscopy
(SEM),
transmission
(TEM),
thermogravimetric
analysis
(TGA),
BET
Surface
area
analysis,
and
vibrating
sample
magnetometer
(VSM).
results
showed
that
nanocatalyst
absorption
peak
at
363
nm
indicated
formation
nanocatalyst,
while
shifted
slightly
274
nm,
indicating
nanocatalyst.
conversion
final
product
aliphatic
aldehyde
alcohol
in
cotton
surface
via
a
solvent
free
aerobic
oxidation
EGCG-Fe3O4
confirmed
1H
13C
NMR.
molecular
weight
determined
mass
spectral
characterisation
(EI-MS),
which
ion
m/z
72.06
(M+,
100%),
isobutyraldehyde
conforming
EI-MS
analysis.
has
been
for
alcohols
textile
pharmaceutical
industries
offers
several
advantages,
use
reaction
conditions,
reduced
catalyst
concentrations,
high
yields,
affordability,
absence
solvents,
recovery
reuse
Deleted Journal,
Год журнала:
2024,
Номер
48(3), С. 599 - 608
Опубликована: Май 4, 2024
5-Substituted-1H-tetrazoles
were
synthesized
via
the
[3
+
2]
cycloaddition
of
NaN3
and
several
nitriles
using
Cu1-xCoxFe2O4
(x
=
0,
0.25,
0.5,
0.75,
1)
nanocatalysts
in
N,N-dimethylformamide
(DMF)
at
120
°C.
The
Cu0.5Co0.5Fe2O4
nanospinel
ferrite
is
most
active
nanocatalyst
comparison
to
other
prepared
nanocatalysts.
This
was
easily
separated
from
reaction
mixture
an
external
magnet
reused
for
five
cycles
without
any
appreciable
loss
catalytic
activity.
cost-effective
easy
availability
catalyst,
simple
methodology,
high
yield,
workup
are
extra
advantages
this
method.
structural
characteristics
catalyst
investigated
by
scanning
electron
microscopy,
X-ray
diffraction,
vibrating
sample
magnetometer
analyses.
Nanoscale Advances,
Год журнала:
2023,
Номер
5(18), С. 4925 - 4933
Опубликована: Янв. 1, 2023
Palladium
complex-supported
on
boehmite
(Pd(0)-SMTU-boehmite)
nanoparticles
were
synthesized
and
characterized
by
using
XRD,
SEM,
EDS,
TGA,
BET,
ICP
FT-IR
techniques.
When
applied
as
a
new
catalyst
for
C-C
coupling
reactions
of
Suzuki-Miyaura
Mizoroki-Heck
in
PEG-400
solvent,
the
Pd(0)-SMTU-boehmite
showed
excellent
activity
recyclability.
The
study
palladium
leaching
ICP-OES
technique
hot
filtration
led
to
exhibiting
stability
Applied Organometallic Chemistry,
Год журнала:
2023,
Номер
38(1)
Опубликована: Ноя. 28, 2023
The
synthesis
and
characterization
of
MCM‐41
magnetic
mesoporous
material,
which
has
been
modified
with
zirconium‐thiouracil
complex
(M‐MCM‐41@TU‐ZrO),
conducted
thoroughly
analyzed
using
an
array
techniques
such
as
X‐ray
diffraction
(XRD),
energy‐dispersive
spectroscopy
(EDX),
elemental
mapping,
scanning
electron
microscopy
(SEM),
Fourier
transform
infrared
(FT‐IR),
Brunauer‐Emmett‐Teller
(BET),
inductively
coupled
plasma‐optical
emission
spectrometry
(ICP‐OES),
thermogravimetric
analysis
(TGA)
vibrating
sample
magnetometer
(VSM).
catalytic
performance
M‐MCM‐41@TU‐ZrO
was
tested
in
the
phenyl
aryl
sulfides
through
a
three‐component
coupling
reaction
halides/phenolic
esters
phenylboronic
acid
sulfur
powder
presence
base
PEG200
at
80–90°C.
Also,
symmetrical
diaryl
halides
nanocatalyst
dimethyl
sulfoxide
120°C
investigated.
A
major
novelty
is
that
this
first
time
highly
efficient
magnetically
recyclable
zirconium
used
for
unsymmetrical
arylboronic
acid/S
8
system
thiolating
agent
phenolic
cross‐coupling
partners.
other
advantages
method
are
follows:
(a)
structurally
diverse
have
synthesized
good
to
high
yields
PEG
green
solvent;
(b)
starting
materials,
source,
catalyst
commercially
available,
cheap,
non‐toxic,
chemically
stable;
(c)
easily
removed
from
mixture
external
magnet
reused
numerous
times
without
any
significant
change
activity.
