Macromolecular Rapid Communications,
Journal Year:
2023,
Volume and Issue:
45(3)
Published: Nov. 13, 2023
Abstract
A
straightforward
approach
is
employed
to
synthesize
methylene‐bridged
poly(hetero
aromatic)s
based
on
furan,
pyrrole,
thiophene,
and
thiophene
derivatives.
The
process
involves
an
electrophilic
aromatic
substitution
reaction
facilitated
by
a
visible
light‐initiated
system
consisting
of
manganese
decacarbonyl
iodonium
salt.
mainly
relies
the
formation
halomethylium
cation,
attack
this
cation
heteroaromatic,
regeneration
methylium
reactivity
differences
between
heteroaromatic
cations
for
successful
polymerizations.
This
innovative
synthetic
strategy
lead
polymers
with
relatively
high
molecular
weights
as
stoichiometric
imbalance
comonomers
increased.
Accordingly,
these
newly
obtained
exhibit
remarkable
fluorescence
properties,
even
at
excitation
wavelengths
low
330
nm.
Moreover,
harnessing
halogens
chain
ends
homopolymers,
block
copolymers
are
successfully
synthesized,
offering
opportunities
tailored
applications
in
diverse
fields.
Industrial & Engineering Chemistry Research,
Journal Year:
2024,
Volume and Issue:
63(9), P. 3962 - 3974
Published: Feb. 22, 2024
Free
radical
polymerization
initiated
under
visible
light
or
sunlight
remains
one
of
the
major
challenges
in
photopolymer
chemistry
area.
Because
low
intensity
modern
sources
(light-emitting
diodes,
LEDs)
and
mismatch
their
absorption
spectra
with
that
irradiation
sources,
commercial
usual
photoinitiators
often
exhibit
poor
efficiency
blue
sunlight.
In
this
work,
eight
naphtho[2,3-d]thiazole-4,9-dione
benzaldehyde-based
oxime
esters
were
developed
as
type
I
multicomponent
photoinitiating
systems
good
properties
region,
especially
at
405
450
nm.
Compared
to
benchmark
photoinitiator
(diphenyl(2,4,6-trimethylbenzoyl)phosphine
oxide,
TPO),
some
our
initiators
furnished
similar
better
photoinitiation
performance
than
reference
upon
exposure
LED@405
TPO,
most
newly
proposed
used
could
furnish
on
par
system
nm
LED@450
Among
interesting
results
study,
final
acrylate
function
conversions
be
obtained
during
free
trimethylolpropane
triacrylate
within
1
h
by
using
solar
when
combined
iodonium
salt
aromatic
amine.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(21), P. 4202 - 4202
Published: Oct. 24, 2023
During
the
last
decades,
multicomponent
photoinitiating
systems
have
been
focus
of
intense
research
efforts,
especially
for
design
visible
light
systems.
Although
highly
reactive
three-component
and
even
four-component
designed,
complexity
to
elaborate
such
mixtures
has
incited
researchers
monocomponent
Type
II
photoinitiators.
Using
this
approach,
photosensitizer
radical/cation
generator
can
be
combined
within
a
unique
molecule,
greatly
simplifying
elaboration
photocurable
resins.
In
field,
sulfonium
salts
are
remarkable
photoinitiators
but
these
structures
lack
absorption
in
range.
Over
years,
various
structural
modifications
carried
out
order
redshift
their
absorptions
region.
work,
an
overview
different
activable
under
reported
date
is
proposed.
Macromolecules,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 17, 2024
New
advanced
iodonium
salts
based
on
stilbene
chromophores
with
significantly
improved
photoinitiating
properties
are
presented.
The
extended
conjugated
double
bond
system
provides
major
improvement
in
quantum
yield
of
superacid
generation
(up
to
10
times
higher
compared
benzylidene-based
salts)
while
maintaining
absorption
UV-A
and
visible
light.
newly
developed
exhibit
activity
toward
cationically
polymerizable
monomers
such
as
cyclic
epoxy
(e.g.,
3,4-epoxycyclohexylmethyl
3,4-epoxycyclohexane-carboxylate
(CADE)),
oxetanes
bis[1-ethyl(3-oxetanyl)]methyl
ether
(OXT-221))
glycidyl
diglycidyl
bisphenol
A
(DGEBA))
under
the
irradiation
by
light-emitting
diodes
(LEDs)
emitting
at
365,
405
even
430
nm,
no
additives.
Commonly
used
diaryliodonium
photoinitiators
inactive
those
wavelengths.
Moreover,
some
new
also
able
photoinitiate
free
radical
photopolymerization
acrylate
monomers,
trimethylolpropane
triacrylate
(TMPTA).
Such
high
allows
these
be
one-component
cationic
vat
3D
printing
nanocomposites
ambient
temperature.
resolution
prints
was
limited
mainly
DLP
printer
slight
signs
overpolymerization.
Chemical Reviews,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 7, 2025
Constructing
chemical
bonds
under
green
sustainable
conditions
has
drawn
attention
from
environmental
and
economic
perspectives.
The
dissociation
of
(hetero)aryl-halide
is
a
crucial
step
most
arylations
affording
(hetero)arene
derivatives.
Herein,
we
summarize
the
(hetero)aryl
halides
activation
enabling
direct
(hetero)arylation
trapping
reagents
construction
highly
functionalized
(hetero)arenes
benign
conditions.
strategies
for
aryl
iodides
are
classified
into
(a)
hypervalent
iodoarene
followed
by
functionalization
thermal/photochemical
conditions,
(b)
aryl-I
bond
in
presence
bases
with/without
organic
catalysts
promoters,
(c)
photoinduced
presence/absence
organophotocatalysts,
(d)
electrochemical
direct/indirect
electrolysis
mediated
organocatalysts
mediators
acting
as
electron
shuttles,
(e)
electrophotochemical
redox-active
organocatalysts.
These
modes
result
exhibiting
diverse
reactivity
formal
cations/radicals/anions
aryne
precursors.
coupling
these
reactive
intermediates
with
leads
to
facile
selective
formation
C-C
C-heteroatom
bonds.
ecofriendly,
inexpensive,
functional
group-tolerant
offer
alternatives
transition
metal-based
catalysis.
