Asian Journal of Organic Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 18, 2024
Abstract
N
‐oxyl
radicals
occupy
an
important
place
in
free‐radical
oxidative
CH‐functionalization
being
one
of
the
most
efficient
redox‐organocatalysts
for
hydrogen
atom
abstraction
(HAT).
Their
applications
include
aerobic
radical
chain
autoxidation,
with
formation
carbon‐carbon
and
carbon‐heteroatom
bonds.
The
persistent
nature
N‐
oxyl
combined
their
high
reactivity
HAT
results
unique
dual
chemistry:
same
can
both
propagate
reaction
(at
low
concentrations)
effectively
“terminate”
carbon‐centered
higher
concentrations).
latter
case
opens
a
new
synthetic
application
area
radicals,
which
they
act
as
abstracting
species
O‐reagents
cross‐coupling
thus
produced.
Apart
from
C−H
bond
cleavage,
reactive
have
been
extensively
used
recently
C=C
double
functionalization
via
addition
reactions.
In
this
review,
reactions
introduction
fragments
alkene
difunctionalizations
by
oxyls
are
covered
emphasis
on
relationship
between
conditions
selectivity.
Chemistry - A European Journal,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 22, 2025
Abstract
Chlorinated
polymers
have
made
enormous
contributions
to
materials
science
and
are
commercially
produced
on
a
large
scale.
These
chlorinated
could
be
recycled
as
chlorine
sources
efficiently
produce
valuable
compounds
owing
their
facile
release
of
HCl.
Although
the
thermal
stability
PVDC
is
low
compared
PVC,
this
can
advantageous
in
terms
easy
fast
dehydrochlorination.
Herein,
we
report
an
efficient
electrochemical
chlorination
using
poly(vinylidene
chloride)
(PVDC)
source
that
works
undivided
cell
applies
good
number
examples.
This
method
commodity
such
waste
PVDC‐PVC
pharma
blister
film,
PVDC‐PO
multilayer
food
packaging,
compression
molded
sheets
Ixan
(with
heat
stabilizer)
with
similar
efficiency.
Furthermore,
also
provides
dechlorination
up
98
%,
leading
unsaturated
dechlorinated
material.
Converting
into
more
stable
compounds,
harmful
chlorine‐containing
gases
during
incineration
minimized.
Additionally,
not
only
restricted
batch
processes
but
electroflow
process
for
electrosynthesis
has
been
demonstrated.
Macromolecules,
Год журнала:
2025,
Номер
58(5), С. 2210 - 2223
Опубликована: Фев. 18, 2025
Polymeric
materials
have
become
indispensable
due
to
their
versatility
and
low
cost,
yet
environmental
impact
presents
a
significant
global
challenge.
Traditional
chemical
recycling
methods
typically
rely
on
heat
as
stimulus;
for
instance,
pyrolysis
is
popular
methodology
which
faces
limitations
high
energy
consumption,
product
selectivity,
the
generation
of
undesirable
byproducts.
In
response,
recent
advances
in
promotion
depolymerization
degradation
through
alternative
stimuli
such
light,
electrochemistry,
mechanical
force,
shown
promising
potential
more
efficient
selective
polymer
breakdown,
yielding
either
starting
monomers
or
valuable
small
molecules.
This
perspective
explores
key
examples
these
emerging
strategies,
highlighting
improve
upon
current
protocols
offer
pathways
under
milder
conditions,
while
identifying
challenges
that
future
research
must
address
translate
chemistry
into
viable
broadly
applicable
strategies.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
45(20)
Опубликована: Июль 15, 2024
Abstract
The
escalating
demand
for
plastics
has
resulted
in
a
surge
of
plastic
waste
worldwide,
posing
monumental
environmental
challenge.
To
address
this
issue,
versatile
photo‐oxidative
degradation
method
applicable
to
seven
distinct
polymer
families
is
proposed,
comprising
poly(isobutyl
vinyl
ether)
(PIBVE),
poly(2,3‐dihydrofuran)
(PDHF),
poly(vinyl
acetate)
(PVAc),
poly(
n
‐butyl
acrylate)
(PBA),
poly(methyl
(PMA),
chloride)
(PVC),
poly(dimethyl
acrylamide)
(PDMA),
poly(ethylene
oxide)
(PEO),
poly(oligo(ethylene
glycol)
methyl
ether
(PEGMEA),
and
even
methacrylate)
(PMMA).
This
employs
photo‐mediated
hydrogen
atom
transfer
(HAT)
followed
by
oxidation
promote
degradation.
reaction
carried
out
under
aerobic
condition
the
presence
iron
trichloride
(FeCl
3
)
as
photocatalyst
combination
with
low‐intensity
purple
light
irradiation.
process
can
degrade
up
97%
less
than
h.
be
easily
controlled
switching
off,
which
allows
precise
modulation
rate,
enhancing
effectiveness
method.
Overall,
provides
sustainable
degrading
various
types
low
energy
input.
ACS Macro Letters,
Год журнала:
2024,
Номер
unknown, С. 1345 - 1354
Опубликована: Сен. 25, 2024
Electrolysis
is
an
emerging
approach
to
polymer
postpolymerization
modification,
deconstruction,
and
depolymerization.
Electrochemical
reactions
are
particularly
appealing
for
macromolecular
transformations
because
of
their
high
selectivity,
ability
be
externally
monitored,
intrinsic
scalability.
Despite
these
desirable
features
the
recent
resurgent
use
small-molecule
electrochemical
reactions,
development
electrolysis
has
been
limited.
Herein,
we
highlight
examples
driven
by
heterogeneous
redox
chemistry.
Throughout
our
exploration
electrolysis,
provide
perspective
on
opportunities
continued
investigation
in
this
nascent
field.
Specifically,
how
targeted
reaction
through
deeper
mechanistic
insight
will
expand
scope
materials
that
can
(de)constructed
with
methods.
As
developed,
expect
emerge
as
a
high-functioning
complementary
tool
functionalization
deconstruction.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(48)
Опубликована: Сен. 10, 2024
Abstract
Plastics
are
omnipresent
in
our
everyday
life,
and
accumulation
of
post‐consumer
plastic
waste
environment
represents
a
major
societal
challenge.
Hence,
methods
for
recycling
high
demand
future
circular
economy.
Specifically,
the
degradation
polymers
towards
value‐added
small
molecules
constitutes
sustainable
strategy
carbon
Despite
recent
advances,
chemical
polymer
continues
to
be
largely
limited
redox
agents
or
low
energy
efficiency
photochemical
processes.
We
herein
report
powerful
iron‐catalyzed
molecular
weight
polystyrenes
through
electrochemistry
efficiently
deliver
monomeric
benzoyl
products.
The
robustness
ferraelectrocatalysis
was
mirrored
by
various
real‐life
plastics,
also
on
gram
scale.
cathodic
half
reaction
represented
hydrogen
evolution
(HER).
scalable
electro‐polymer
could
solely
fueled
solar
commercially
available
panel,
indicating
an
outstanding
potential
decentralized
green
Chemical Society Reviews,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
So
you've
discovered
a
reaction.
This
review
discusses
the
key
areas
involved
in
developing
new
reactions
and
provides
handy
checklist
guide
to
help
maximise
potential
of
your
novel
transformation.
Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 18, 2025
Abstract
The
demand
for
commodity
plastics
reaches
unprecedented
dimensions.
In
contrast
to
the
well‐developed
plethora
of
methods
polymer
synthesis,
sustainable
strategies
end‐of‐life
management
continue
be
scarce.
While
mechanical
re‐cycling
often
results
in
downgraded
materials,
chemical
or
up‐cycling
offers
tremendous
potential
an
efficient
and
green
approach,
thereby
addressing
precarious
treatment
post‐use
within
a
circular
carbon
economy.
Recently,
electrochemistry
surfaced
as
uniquely
powerful
tool
via
functionalization
degradation
obtaining
either
novel
polymers
with
valorized
properties
high‐value
recycled
small
molecules,
respectively.
discussing
recent
progress
that
domain,
future
perspectives
electrochemical
modifications
until
January
2025
are
outlined
herein.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Май 6, 2025
The
escalating
plastic
waste
crisis
stems
from
limitations
in
conventional
recycling
methods,
which
are
energy-intensive
and
produce
lower-quality
materials,
leaving
a
substantial
portion
unrecycled.
Here,
we
report
versatile
organo-photocatalytic
upcycling
method
employing
an
easily
accessible
phenothiazine
derivative,
PTH-3CN,
to
selectively
deconstruct
wide
array
of
commodity
polymers-including
polyethylene
terephthalate
(PET),
(PE),
polypropylene
(PP),
polystyrene
(PS),
polyvinyl
chloride
(PVC),
polyurethanes
(PU),
polycarbonates
(PC),
other
vinyl
polymers-into
valuable
small
molecules
with
minimal
catalyst
loading
(as
low
as
500
ppm).
Operating
under
mild
conditions
visible
light
ambient
air,
this
protocol
requires
no
additional
acids
or
metals
adapts
effectively
mixed
post-consumer
waste.
Mechanistic
analysis
reveals
that
PTH-3CN
serves
precatalyst,
decomposing
into
active
triarylamine
species
drive
efficient
degradation
likely
through
consecutive
photoinduced
electron
transfer
mechanism.
This
approach
offers
promising,
scalable
route
for
sustainable
broad
applicability.
