The Journal of Organic Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 4, 2024
Here
we
report
a
strategy
that
eliminates
the
need
for
photocatalysts
and
external
additives,
which
provides
an
operable
mild
method
halogen
radical-enabled
dearomatization
of
N-arylpropiolamides
under
oxygen
atmosphere
at
room
temperature.
The
is
applicable
to
wide
range
substrates,
extending
beyond
limited
scope
p-methoxyl
N-phenylpropynamides.
Furthermore,
several
functional
synthetic
intermediates
anticancer
bioactive
molecules
were
successfully
derived
from
3-halogenated
azaspiro[4.5]trienones.
ACS Catalysis,
Год журнала:
2024,
Номер
14(10), С. 7664 - 7673
Опубликована: Май 2, 2024
Our
study
proposes
an
approach
to
semiheterogeneous
photocatalysis,
focusing
on
recyclability
challenges.
We
developed
a
method
employing
visible
light
with
photoinert
anhydrous
CeCl3,
rendering
it
into
reusable
photocatalyst.
Despite
being
and
insoluble
in
organic
solvents,
CeCl3
formed
transient
charge
transfer
complex
acetonitrile,
denoted
as
-
NXS
(NBS
or
NCS),
due
the
strong
oxophilicity
of
trivalent
cerium
toward
oxygen.
This
facilitated
visible-light
absorption,
leading
photoexcitation
Ce(III)
complexes
conversion
centers
potent
reductants,
donating
electrons
NXS.
As
proof
concept,
we
demonstrated
reactions
where
NXS,
upon
accepting
electrons,
generated
halide
radicals,
allowing
synthesis
gem-dihaloketones
under
sunlight
from
terminal
aromatic
alkynes
via
C–X
cross-coupling
reactions.
Significantly,
exhibited
without
notable
decomposition,
by
its
regeneration
isolation
through
simple
filtration
postreaction,
underscoring
potential
for
prolonged
use.
The
temperature-dependent
switching
behavior
of
the
saccharin
radical
is
demonstrated,
enabling
regiodivergent
C3–H
and
C7–H
functionalization
quinoxalin-2(1H)-ones.
was
generated
through
N–Br
bond
cleavage
in
N-bromosaccharin
(NBSA)
observed
to
transition
between
radicophile
roles.
At
−10
°C,
it
utilized
as
a
radicophile,
resulting
100%
C3-amination,
while
at
+35
acted
radical,
leading
exclusive
C7-bromination.
Radical
nucleophilicity
controlled
by
temperature
modulation.
ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(14), С. 16913 - 16921
Опубликована: Июль 16, 2024
Metal
halide
perovskite
nanocrystals
(NCs)
possess
immense
potential
in
photocatalysis.
However,
deciphering
the
intricate
surface
chemistry
that
governs
these
catalytic
processes
remains
a
challenge.
This
study
investigates
C–X
bond
activation
with
CsPbBr3
NCs,
focusing
on
elucidating
role
of
dynamic
molecular
domains
dictating
activity.
By
manipulating
interactions
through
ligand
dynamics,
we
identify
vacancies
as
critical
sites
for
activation.
A
systematic
exploration
different
types
reveals
varying
kinetics
exchange,
oleyl
amine-capped
NCs
demonstrating
highest
reactivity.
Temperature-dependent
photoluminescence
measurements
corroborate
findings,
highlighting
influence
dynamics
interactions.
Additionally,
postsynthetic
treatments,
such
lead
oleate
modification,
which
leads
to
an
increase
density
active
(halide
vacancies),
significantly
enhance
performance.
Conversely,
SOBr2
treatment,
repairs
bromide
vacancies,
results
almost
completely
suppressed
So,
by
engineering
environments,
demonstrate
significant
improvement
performance
metal
offering
valuable
insights
future
development.
Green Energy and Environmental Technology,
Год журнала:
2024,
Номер
3
Опубликована: Авг. 1, 2024
Energy
and
environment
are
two
of
the
most
important
issues
our
time
on
a
worldwide
scale.
Photocatalysis
is
environmentally
friendly
answer
to
these
issues.
Perovskite-based
materials
have
sparked
attention
due
their
low
cost
lack
toxicity.
Substitutable
solar
energy
semiconductor
photocatalytic
technologies
essential
ways
reduce
or
avert
global
catastrophes
concerns.
It
estimated
that
over
one
thousand
different
such
as
KGaO
3
RbMg
2
Ti
O
10
been
tested
for
potential
photocatalysts
recently.
Among
many
endeavors,
production
seen
crucial
technique
using
long-term
environmental
reasons.
Many
(RbGaO
)
previously
combined.
A
photoelectrochemical
cell
device
converts
light
electricity
via
reaction.
The
sun
major
source
power.
Clean
hydrogen
generated
by
photocatalyst,
which
removes
both
inorganic
organic
contaminants
from
water.
Photocatalysts
operate
whole
spectrum
developed
result
significant
advances
in
this
area.
various
produced
so
far,
single-
double-perovskite-based
received
lot
attention.
The Journal of Organic Chemistry,
Год журнала:
2024,
Номер
89(3), С. 1784 - 1796
Опубликована: Янв. 12, 2024
The
atom
transfer
radical
addition
(ATRA)
reaction
is
defined
as
a
method
for
introducing
halogenated
compounds
into
alkenes
via
mechanism.
In
this
study,
we
present
an
ATRA
approach
achieving
regioselective
functionalization
of
quinoxalin-2(1H)-ones
by
activating
C–Br
bonds
CBr4
and
subsequent
trihaloalkyl-carbofunctionalization
styrenes
employing
the
9-mesityl-10-methylacridinium
perchlorate
(Fukuzumi)
photocatalyst
under
3W
blue
LED
(450–470
nm)
irradiation.
This
three-component
cascade
process
demonstrates
remarkable
efficiency
in
synthesis
1-methyl-3-(3,3,3-tribromo-1-(4-chlorophenyl)propyl)quinoxalin-2(1H)-one
derivatives.
Visible-light-induced
halide-exchange
between
halide
perovskite
and
organohalide
solvents
has
been
studied
in
which
photoinduced
electron
transfer
from
CsPbBr
Catalysis Science & Technology,
Год журнала:
2023,
Номер
14(1), С. 183 - 189
Опубликована: Ноя. 28, 2023
In
this
study,
we
demonstrate
the
proficiency
of
orthorhombic
CsPbBr
3
to
perform
C–H
chalcogenation
reactions
electron-rich
arenes
under
conditions
involving
polar
solvents,
aerobic
environments,
and
visible-light
irradiation.
A
graphitic
carbon
nitride/lead-free
double
perovskite
heterojunction
(g-C3N4/Cs2AgBiCl6)
has
been
adopted
as
a
heterogeneous
photocatalyst
under
visible
light
irradiation.
The
employed
material
enabled
the
atom
transfer
radical
addition-type
carbohalogenation
of
multiple
C-C
bonds,
including
(internal)
alkenes
and
alkynes,
with
alkyl
halides.
protocol
showed
remarkable
functional
group
tolerance,
compatible
late-stage
functionalization
natural
pharmaceutical
derivatives,
could
be
easily
scaled
up,
delivering
>1
g
desired
products.
