Macromolecular Rapid Communications,
Journal Year:
2023,
Volume and Issue:
44(9)
Published: March 21, 2023
Poly(methyl
methacrylate)
(PMMA)
is
a
well-known
and
widely
used
commodity
plastic.
High
production
amount
of
PMMA
causes
excessive
waste
creation
that
highlights
the
necessity
recycling.
Conventional
recycling
methods
require
elevated
temperatures
to
induce
degradation
or
depolymerization.
In
this
work,
visible
light
induced
photodegradation
system
by
using
dimanganese
decacarbonyl
(Mn2
(CO)10
)
with
high
halogen
affinity
reported.
Halide
functional
photodegradable
polymers
are
prepared
copolymerization
methyl
methacrylate
α-chloroacrylate
conventional
reversible
addition-fragmentation
chain-transfer
polymerization.
Synthesized
copolymers
efficiently
degraded
low
molecular
weight
oligomers
under
irradiation
in
presence
Mn2
.
Characteristics
precursors,
polymers,
kinetics
depolymerization
investigated
gel
permeation
chromatography
(GPC),
differential
scanning
calorimetry
(DSC),
thermogravimetric
analysis
(TGA),
Fourrier
transform
infrared
(FTIR),
proton
nuclear
magnetic
resonance
(1
H-NMR)
spectroscopies.
The
reported
approach
expected
trigger
further
development
more
environmentally
friendly
techniques
near
future
as
we
moving
toward
greener
sustainable
world.
Chemical Science,
Journal Year:
2023,
Volume and Issue:
14(46), P. 13384 - 13391
Published: Jan. 1, 2023
Sulfinamides
are
some
of
the
most
centrally
important
four-valent
sulfur
compounds
that
serve
as
critical
entry
points
to
an
array
emergent
medicinal
functional
groups,
molecular
tools
for
bioconjugation,
and
synthetic
intermediates
including
sulfoximines,
sulfonimidamides,
sulfonimidoyl
halides,
well
a
wide
range
other
S(iv)
S(vi)
functionalities.
Yet,
accessible
chemical
space
sulfinamides
remains
limited,
approaches
largely
confined
two-electron
nucleophilic
substitution
reactions.
We
report
herein
direct
radical-mediated
decarboxylative
sulfinamidation
first
time
enables
access
from
broad
structurally
diverse
carboxylic
acids.
Our
studies
show
formation
prevails
despite
inherent
thermodynamic
preference
radical
addition
nitrogen
atom,
while
machine
learning-derived
model
facilitates
prediction
reaction
efficiency
based
on
computationally
generated
descriptors
underlying
reactivity.
Organic Letters,
Journal Year:
2024,
Volume and Issue:
26(15), P. 3174 - 3178
Published: April 8, 2024
A
concept
for
the
dual
use
of
acridine
and
tetrabutylammonium
decatungstate
photocatalysts
in
reactions
carboxylic
acids
is
proposed.
Imines
generated
situ
from
aldehydes
p-methoxyaniline,
as
well
other
azomethines,
were
used
radical
acceptors.
The
role
believed
to
facilitate
turnover
photocatalyst
by
means
hydrogen
atom
transfer.
Chemical Science,
Journal Year:
2024,
Volume and Issue:
15(25), P. 9582 - 9590
Published: Jan. 1, 2024
Diverse
amines
and
amino
acids
are
now
readily
accessed
from
carboxylic
acids,
aldehydes,
amine
precursors
in
a
direct
decarboxylative
reaction
enabled
by
homogeneous
triple
catalytic
system
based
on
acridine
photocatalysis.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(33)
Published: May 27, 2024
The
chemically
inert
nature
of
fully
saturated
hydrocarbon
backbones
endows
vinyl
polymers
with
desirable
durability,
but
it
also
leads
to
their
significant
environmental
persistence.
Enhancing
the
sustainability
these
materials
requires
a
pivotal
yet
challenging
shift:
transforming
backbone
into
one
that
is
degradable.
Here,
we
present
versatile
platform
for
mechanochemically
editing
towards
degradable
polymer
chains
by
integrating
cyclobutene-fused
succinimide
(CBS)
units
along
through
photo-iniferter
reversible
addition-fragmentation
chain-transfer
(RAFT)
copolymerization.
Significantly,
evenly
insertion
CBS
does
not
compromise
thermal
or
chemical
stability
rather
offers
means
adjust
properties
polymethylacrylate
(PMA).
Meanwhile,
reactive
acyclic
imide
can
be
selectively
introduced
mechanochemical
activation
(pulse
ultrasonication
ball-milling
grinding)
when
required.
Subsequent
hydrolysis
groups
enables
efficient
degradation,
yielding
telechelic
oligomers.
This
approach
holds
promise
inspiring
design
and
modification
more
environmentally
friendly
editing.
Macromolecular Rapid Communications,
Journal Year:
2023,
Volume and Issue:
44(9)
Published: March 21, 2023
Poly(methyl
methacrylate)
(PMMA)
is
a
well-known
and
widely
used
commodity
plastic.
High
production
amount
of
PMMA
causes
excessive
waste
creation
that
highlights
the
necessity
recycling.
Conventional
recycling
methods
require
elevated
temperatures
to
induce
degradation
or
depolymerization.
In
this
work,
visible
light
induced
photodegradation
system
by
using
dimanganese
decacarbonyl
(Mn2
(CO)10
)
with
high
halogen
affinity
reported.
Halide
functional
photodegradable
polymers
are
prepared
copolymerization
methyl
methacrylate
α-chloroacrylate
conventional
reversible
addition-fragmentation
chain-transfer
polymerization.
Synthesized
copolymers
efficiently
degraded
low
molecular
weight
oligomers
under
irradiation
in
presence
Mn2
.
Characteristics
precursors,
polymers,
kinetics
depolymerization
investigated
gel
permeation
chromatography
(GPC),
differential
scanning
calorimetry
(DSC),
thermogravimetric
analysis
(TGA),
Fourrier
transform
infrared
(FTIR),
proton
nuclear
magnetic
resonance
(1
H-NMR)
spectroscopies.
The
reported
approach
expected
trigger
further
development
more
environmentally
friendly
techniques
near
future
as
we
moving
toward
greener
sustainable
world.
