A
green,
regenerative
and
highly
active
Cu(0)
catalyst
derived
from
waste
fibre-based
cellulose-supported
poly(hydroxamic
acid)
was
synthesized.
The
surface
of
the
hydrolyzed
cellulose
undergone
chemical
modification
through
graft
co-polymerization
using
methyl
acrylate.
Then
poly(methyl
acrylate)
further
converted
into
bidentate
chelating
ligand
via
Wilhelm
Lossen
rearrangement
in
an
alkaline
hydroxylamine
aqueous
solution.
Finally,
copper
impregnated
onto
adsorption
process
forming
stable
five-member
ring
complex;
Cu(II)NPs@PHA.
Cu(II)NPs@PHA
is
reduces
Cu(0)NPs@PHA
hydrazine
hydride
as
a
reducing
agent.
fully
characterized
by
FT-IR,
FE-SEM
&
EDX,
TEM,
ICP-OES,
TGA,
XRD
XPS
analyses.
successfully
applied
to
Aza-Michael
addition
reaction
with
several
Michael
acceptors
various
substituted
aryl/heterocyclic/alky
amine
afford
corresponding
C-N
product
excellent
yield
[aryl
(50-95%);
heterocyclic
(50-96%);
alkyl
(80-98%)].
showed
extraordinary
stability
it
easy
recover
mixture
could
be
reused
up
five
times
without
loss
its
original
catalytic
activity.
Polymers,
Год журнала:
2020,
Номер
13(1), С. 37 - 37
Опубликована: Дек. 24, 2020
Plastic
production
has
increased
by
almost
200-fold
annually
from
2
million
metric
tons
per
year
in
1950s
to
359
2018.
With
this
rapidly
increasing
production,
plastic
pollution
become
one
of
the
most
demanding
environmental
issues
and
tremendous
efforts
have
been
initiated
research
community
for
its
disposal.
In
present
study,
we
reported
first
time,
a
biomass-waste-derived
heterogeneous
catalyst
prepared
waste
orange
peel
depolymerisation
poly(ethylene
terephthalate)
(PET)
monomer,
bis(2-hydroxyethyl
(BHET).
The
ash
(OPA)
was
well-characterised
using
techniques
such
as
IR,
inductively
coupled
plasma
(ICP)-OES
(Optical
Emission
Spectrometry),
XRD,
X-ray
fluorescence
(XRF),
SEM,
energy-dispersive
spectroscopy
(EDX),
TEM,
BET
(Brunauer-Emmett-Teller)
TGA.
found
be
composed
basic
sites,
high
surface
area,
notable
type-IV
N2
adsorption–desorption
isotherm
indicating
mesoporous
nature
catalyst,
which
might
eventually
enhanced
rate
reaction
well
yield
product.
completely
depolymerises
PET
within
90
min,
producing
79%
recrystallised
BHET.
ability
reusing
catalysts
5
consecutive
runs
without
significant
depreciation
catalytic
activity
eco-
environmental-friendliness
endorses
protocol
greener
route
recycling.
Abstract
A
highly
effective
green
technique
for
the
synthesis
of
bis(indolyl)
methanes
mediated
by
‘Aqueous
Extract
Dillenia
indica’
(AEDI)
is
developed.
The
reaction
involves
a
simple
procedure
at
moderate
temperature
below
60
°C
in
air
within
short
time
30–60
minutes
under
conditions
free
from
external
promoters,
acids,
ligands/organic
media
using
our
natural
water–extracted
catalyst,
affording
to
high
yield.
This
protocol
offers
mild,
effective,
and
economical
alternative
existing
protocols
promotes
more
environmentally
friendly
protic
Lewis
acids
catalysts
that
are
already
use.
Physical Sciences Reviews,
Год журнала:
2022,
Номер
8(10), С. 3139 - 3181
Опубликована: Фев. 2, 2022
Abstract
The
backbone
of
synthetic
organic
chemistry
is
the
formation
carbon–carbon
and
carbon–heteroatom
bonds.
Scientists
are
actively
working
to
develop
new
methods
bond-forming
reactions
because
it
one
most
useful
tools
for
development
structurally
diverse
molecular
entities.
On
other
hand,
scientists
constantly
discovering
chemical
processes
make
them
more
sustainable
in
order
avoid
ever-increasing
emission
associated
with
hazards
environment.
Thus,
greener
catalytic
demonstrated
a
massive
uptick
ability
carry
out
under
environmentally
friendly
simple
reaction
conditions.
Various
approaches
demonstrated,
namely,
solvent-free,
microwave
irradiation,
ionic
liquids,
ball
milling,
ultrasound,
one-pot,
aqueous-mediated
green
protocol.
Agro-waste
postharvest
part
or
agricultural
residues
derived
from
various
activities,
which
has
scope
applications.
use
this
agro-waste
an
eco-friendly
cost-effective
process
waste
management.
Appropriate
optimal
utilization
these
by-products
major
challenges
present
days.
recent
trend
around
globe
transform
into
wealth
concepts
achieve
Agro-waste-derived
ashes
extracted
medium
successfully
studied
recently
as
heterogeneous-
homogenous-based
catalyst
transformations.
catalysts
easily
available,
cost-effective,
prepare,
nontoxic,
easy
handle,
biodegradable,
benign.
This
article
focuses
on
few
instances
agro-waste-based
homogeneous
heterogeneous
synthesis,
especially
those
used
construction
bioactive
molecule
synthesis
via
C–C
C–X
bond
discussed.
compiled
literature
based
keywords
search
engine
“agro-waste-based
transformations”,
review
articles
published
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