Chemical Communications,
Journal Year:
2022,
Volume and Issue:
58(95), P. 13266 - 13269
Published: Jan. 1, 2022
We
present
a
novel
series
of
neutral
photo-acid
generators
(PAGs)
based
on
carbazole
derivatives.
A
photo-induced
6π-electrocyclization
reaction
derivatives
triggers
the
subsequent
release
halogen
acids.
With
UV
irradiation,
PAGs
spontaneously
acid
molecules
quantitatively
forming
polyaromatic
compounds.
To
our
knowledge,
it
is
considered
highest
quantum
yield
(over
85%)
among
Brønsted
PAGs.
Nanoscale,
Journal Year:
2023,
Volume and Issue:
15(38), P. 15472 - 15512
Published: Jan. 1, 2023
Hydrophilic
antifouling
polymers
are
important
materials
for
nanomedicine
and
surface
modification
applications.
In
this
review,
we
discuss
their
structures,
properties,
function
in
the
context
of
recent
nanoscale
Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
61(36)
Published: June 14, 2022
Abstract
Organocatalysis
has
evolved
into
an
effective
complement
to
metal‐
or
enzyme‐based
catalysis
in
polymerization,
polymer
functionalization,
and
depolymerization.
The
ease
of
removal
greater
sustainability
organocatalysts
relative
transition‐metal‐based
ones
spurred
development
specialty
applications,
e.g.,
medical
devices,
drug
delivery,
optoelectronics.
Despite
this,
the
use
organocatalysis
other
organomediated
reactions
chemistry
is
still
rapidly
developing,
we
envisage
their
growing
application
nascent
areas
such
as
controlled
radical
additive
manufacturing,
chemical
recycling
coming
years.
In
this
Review,
describe
ten
trending
where
anticipate
paradigm
shifts
resulting
from
novel
transition‐metal‐free
conditions.
We
highlight
opportunities
challenges
detail
how
new
discoveries
could
lead
previously
inaccessible
functional
materials
a
potentially
circular
plastics
economy.
Macromolecules,
Journal Year:
2023,
Volume and Issue:
56(10), P. 3607 - 3616
Published: May 1, 2023
Polymer
materials
featuring
stereocontrolled
monomer
units
often
exhibit
drastically
different
properties
than
their
stereorandom
counterparts.
Control
over
the
polymer
tacticity
thus
represents
a
powerful
means
to
access
functional
polymers
of
modular
thermomechanical
properties.
In
present
work,
series
chiral
amino(thio)ureas
(U1,
TU1–TU5)
are
used
in
duos
with
phosphazene
organic
bases
for
stereoselective
ring-opening
polymerization
(ROP)
racemic
lactide
(rac-LA).
These
binary
organocatalytic
pairs
allow
relatively
fast,
highly
chemo-
and
isoselective
ROP
rac-LA
at
room
temperature
toluene,
yielding
semicrystalline
metal-free
stereoblock-like
based
on
polylactide
(PLA),
melting
range
138–176
°C.
The
dimethylaminourea,
denoted
as
U1,
shows
faster
reactions
relative
its
dimethylaminothiourea
TU1
analogue,
when
combined
any
bases,
consistent
formation
less
stable
intermediates
from
urea
more
acidic
thiourea-containing
counterpart.
On
other
hand,
tethered
dialkylamino
moiety
TU1–TU3
is
shown
have
non-innocent
role
both
catalytic
activity
isoselectivity
process,
whereby
decreasing
basicity
this
group
leads
decrease
reaction
rates.
active
mechanism
also
proves
be
dependent
identity
amino(thio)urea
base,
mechanistic
rationale
experimental
results
presented.
Thus,
strongest
base
conjunction
U1
TU1–TU5,
leading
high
rate
but
lesser
stereocontrol,
induces
an
ionic-like
mechanism.
contrast,
least
basic
favor
associative
involving
hydrogen
bond
interactions,
providing
slower
reactions,
producing
isotactic
PLAs.
Communications Chemistry,
Journal Year:
2025,
Volume and Issue:
8(1)
Published: Jan. 16, 2025
Iminophosphoranes
with
the
general
formula
(R3P═NR′)
have
great
potential
in
synthetic
chemistry
as
valuable
precursors/intermediates
organic
synthesis
or
building
blocks
for
various
compounds.
However,
approaches
and
conditions
to
prepare
iminophosphoranes
are
still
poorly
understood,
limiting
utility
of
this
materials.
In
article,
a
simple
efficient
previously
unattainable
poly(arylene
iminophosphoranes)
is
reported.
The
azide-phosphine
Staudinger
polycondensation
used,
reaction
carefully
studied,
including
consideration
light
air,
influence
solvent
temperature,
investigation
electronic
steric
effects
multiazides.
newly
defined
appear
be
highly
versatile,
allowing
use
both
electron-rich
electron-deficient
arylazides
phosphines
synthesize
library
iminophosphorane)
networks
that
exhibit
exceptional
thermal
oxidative
stability.
Interestingly,
despite
ylidic-form
iminophosphorane
linkage
shown
by
theoretical
calculations,
these
developed
poly(arylene-iminophosphorane)
semiconducting
properties,
such
absorption
band
edges
up
800
nm
optical
gaps
range
1.70
2.40
eV.
Finally,
we
demonstrate
broad
applicability
polymers
processing
them
into
glassy
films,
creating
foam-like
structures
synthesizing
metallo-polymer
hybrids.
Conjugated
semiconductor
properties
interest
applications,
but
conjugated
without
defects
remains
challenging.
Here,
authors
explore
modified
preparation
iminophosphorane-linked
polymers,
producing
iminophosphorane)-based
foams,
metallo-polymers.
Polymer Chemistry,
Journal Year:
2023,
Volume and Issue:
14(17), P. 2027 - 2033
Published: Jan. 1, 2023
Monomer
design
strategy
via
functional
substitution
served
as
a
powerful
tool
to
improve
chemical
recyclability
of
the
resulting
polymers
and
fine-tune
their
thermal
mechanical
properties.
Environmental Science Advances,
Journal Year:
2023,
Volume and Issue:
2(9), P. 1151 - 1166
Published: Jan. 1, 2023
The
widespread
production
and
utilization
of
plastic
products
have
become
ingrained
in
our
society,
resulting
a
staggering
amount
waste,
severe
environmental
challenges,
resource
depletion.
