Abstract
The
use
of
bioresource‐derived
wastes
to
valuable
organic
reactions
is
a
new
and
fascinating
trend
in
the
current‐day
chemistry
which
aims
at
decrease/elimination
depleting
resources
based
chemicals.
This
article
discusses
sustainable
protocol
for
synthesis
C=C
bonds
via
Knoevenagel
condensation
reaction
α‐cyano
esters
with
aldehydes
using
water
extract
Annona
squamosa
fruit
shell
ash
(WEASF)
as
catalyst.
These
have
been
conducted
room
temperature
(RT)
aqueous
media
products
are
purified
by
recrystallization.
WEASF
acts
biorenewable
base
process
avoids
solvents
column‐based
purifications
products.
bio‐derived
also
showed
its
high
reusability
current
alternative
existing
methods
making
polysubstituted
olefins.
Molecules,
Год журнала:
2022,
Номер
27(1), С. 328 - 328
Опубликована: Янв. 5, 2022
The
synthesis
of
metal-free
carbon-based
electrocatalysts
for
oxygen
reduction
reactions
(ORR)
to
replace
conventional
Pt-based
catalysts
has
become
a
hot
spot
in
current
research.
This
work
proposes
an
activation-assisted
carbonization
strategy,
manufacture
N-doped
ultra-thin
carbon
nanosheets
(GWS180M800)
with
high
catalytic
activity,
namely,
melamine
is
used
as
accelerator/nitrogen
source,
and
walnut
green
peels
biological
waste
source.
acts
nitrogen
donor
the
hydrothermal
process,
effectively
enhancing
doping
rate.
content
pyridine
groups
accounts
up
48.5%
total
content.
Electrochemical
tests
show
that
GWS180M800
excellent
ORR
electrocatalytic
activity
stability,
makes
quasi-four-electron
pathway
clear
alkaline
electrolyte.
initial
potential
half
slope
are
1.01
0.82
V
vs.
RHE,
respectively.
catalyst
better
ability
avoid
methanol
cross
poisoning
than
Pt/C
has.
Compared
20
wt%
Pt/C,
improved
tolerance
stability.
It
biochar
great
development
application
prospects.
result
provides
new
space
preparation
valuable
porous
nano-carbon
materials
based
on
carbonaceous
solid
ideas
catalyzing
wide
range
electrochemical
future.
ChemistrySelect,
Год журнала:
2021,
Номер
6(48), С. 14077 - 14081
Опубликована: Дек. 23, 2021
Abstract
A
convenient
and
environmentally
benign
protocol
for
Michael
addition
has
been
developed
using
water
extract
of
incense
sticks
ash
(WEISA)
at
room
temperature.
This
is
the
first
report
to
utilize
WEISA
as
an
effective
renewable
medium
formation
C−C
C−S
bonds
via
readily
available
chalcones
various
nucleophiles
like
malononitrile,
benzyl
cyanide,
nitromethane
thiols.
generated
from
waste
material,
therefore,
present
development
eco‐friendly
cost‐effective.
The
corresponding
adducts
were
isolated
with
high
yields
by
simple
precipitation
sequential
washing
aqueous
ethanol;
avoids
extraction
column
chromatographic
purification
steps.
other
significant
features
are
clean
reaction
profile,
functional
group
tolerance,
large‐scale
synthesis,
reusability
media.
Additionally,
a
straightforward
application
this
methodology
shown
in
synthesis
biologically
relevant
2‐amino‐4
H
‐chromene
derivatives.
