Prayogik Rasayan,
Journal Year:
2023,
Volume and Issue:
7(1)
Published: Jan. 1, 2023
In
recent
years,
organic
photo-redox
catalysts
such
as
Ru
or
Ir-metal
complexes
and
dyes
have
expanded
the
traditional
catalytic
toolbox
due
to
their
sustainability
environment
friendliness.
The
central
focus
of
this
review
is
explore
unconventional
photo-catalysts
activity
in
transformations.
However,
an
overview
unorthodox
has
been
demonstrated
herein
illuminate
photocatalytic
space
synthesis.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(6)
Published: Jan. 8, 2024
Abstract
A
method
for
the
generation
of
tertiary
carbanions
via
a
deaminative
radical‐polar
crossover
is
reported
using
redox
active
imines
from
α‐tertiary
primary
amines.
variety
benzylic
amines
and
amino
esters
can
be
used
in
this
approach,
with
latter
engaging
novel
“aza‐Reformatsky”
reaction.
Electronic
trends
correlate
stability
resulting
carbanion
reaction
efficiency.
The
anions
trapped
different
electrophiles
including
aldehydes,
ketones,
imines,
Michael
acceptors,
H
2
O/D
O.
Selective
anion
formation
achieved
presence
another
equivalent
or
more
acidic
C−H
bond
both
an
inter‐
intramolecular
fashion.
Mechanistic
studies
suggest
intermediacy
discrete
intermediate.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(30), P. 20904 - 20912
Published: July 20, 2024
Although
divalent
Sm
reagents
are
some
of
the
most
important
single-electron
transfer
for
reductive
transformations,
their
catalytic
applications
challenging.
In
this
study,
a
bidentate
phosphine
oxide
ligand
substituted
with
9,10-diphenylanthracene
as
visible-light
antenna
was
designed
Sm-catalyzed
reduction
reactions
under
mild
reaction
conditions.
Pinacol
coupling
aryl
ketones
and
aldehydes
developed
1
mol
%
catalyst
organic
amine
(DIPEA)
sacrificial
reductant.
Mechanistic
studies
suggest
that
visible-light-antenna
coordinates
to
Sm(III)
reduces
Sm(II)
irradiation.
The
system
is
also
applicable
cross-pinacol
other
including
aza-pinacol
coupling,
flavone
dimerization,
C-O
bond
cleavage,
C-C
ring-opening
cyclopropane,
ketyl-olefin
cross-coupling
ketyl
radical
α-amino
radical.
Green Chemistry,
Journal Year:
2023,
Volume and Issue:
25(10), P. 4129 - 4136
Published: Jan. 1, 2023
A
green
and
efficient
procedure
for
photoinduced
generation
of
ketyl
radicals
with
no
use
any
external
photocatalyst
is
demonstrated,
enabling
a
series
important
C–C
coupling
reactions
in
synthetic
chemistry.
Chemical Science,
Journal Year:
2024,
Volume and Issue:
15(11), P. 4114 - 4120
Published: Jan. 1, 2024
Starting
from
the
same
substrates,
tunable
C–H
functionalization
and
dearomatization
have
been
achieved
under
catalysis
of
a
new
organic
photocatalyst
–
isoazatruxene
ITN-2.
Organometallics,
Journal Year:
2024,
Volume and Issue:
43(16), P. 1698 - 1705
Published: Feb. 13, 2024
Hydrogenation
of
ketones,
aldehydes,
and
imines
plays
an
important
role
in
organic
synthesis
due
to
the
ubiquity
alcohols
amines
complex
molecules.
The
highly
negative
reduction
potentials
carbonyl
compounds
typically
necessitate
strong
hydride
reagents,
high-pressure
hydrogen
gas,
or
UV
light
facilitate
hydrogenation
reactions.
Visible-light
photoreduction
these
substrates,
a
more
recent
development,
usually
results
formation
diol
diamine
products
via
dimerization
ketyl
iminyl
radical
intermediates.
In
this
work,
taking
advantage
hydricity
1,3-dimethyl-2,3-dihydro-2-phenylbenzimidazole
(BIH)
coupled
with
potent
excited-state
reducing
power
β-diketiminate-supported
bis-cyclometalated
iridium
photosensitizer,
we
promote
switch
selectivity
from
hydrogenation.
This
method
overcomes
difficulty
carbonyls
imines,
allowing
visible-light
photohydrogenation
challenging
as
−2.57
V
versus
ferrocene.
optimized
reactions
are
entirely
selective
for
hydrogenation,
elucidate
which
reaction
components
essential
achieving
selectivity.
Catalysts,
Journal Year:
2023,
Volume and Issue:
13(2), P. 308 - 308
Published: Jan. 30, 2023
Visible-light-active,
organic,
heterogeneous
photocatalysts
offer
an
ecologically
friendly
and
sustainable
alternative
to
traditional
metal-based
catalysts.
In
this
work,
we
report
the
microwave
synthesis
of
nanocarbon
dots
(CDs),
loaded
with
graphitic
carbon
nitride
(g-C3N4).
The
fabricated
nanocomposite
was
shown
exhibit
various
properties,
such
as
Schottky
heterojunction.
optical
functional
group
analysis,
surface
morphology,
crystallinity,
chemical
stability,
electronic
pore
size
distribution
synthesized
were
analyzed
by
Ultraviolet-Diffuse
Reflectance
Spectroscopy
(UV-DRS),
Photoluminescence
(PL),
Fourier
Transform
Infrared
(FTIR),
Transmission
Electron
Microscopy
(TEM),
X-Ray
Diffraction
(XRD),
Zeta
potential,
Photoelectron
(XPS),
Brunauer–Emmett–Teller
(BET).
Until
now,
best
our
knowledge,
there
have
been
no
reports
published
on
light-assisted
O-arylation
2-chloroquinoline-3-carbaldehyde.
Therefore,
explored
photocatalytic
activity
in
production
O-arylated
This
facile
technique
uses
a
blue
LED
light
source
non-conventional
operates
under
moderate
conditions,
resulting
useful
products.
experimental
data
shows
good
recyclability
catalyst
for
up
five
cycles
without
loss
catalytic
activity,
simple
operational
protocol,
easy
recoverability
catalyst,
product
yields
(65–90%)
within
12–24
h.
Additionally,
preliminary
mechanistic
investigations
are
discussed.
results
show
that
phenoxy
quinoline-3-carbaldehyde
radicals
generated
upon
irradiation
during
course
reaction
responsible
C-O
bond
formation,
which
O-arylation.
present
study
clearly
indicates
0D/2D
nanocomposites
bright
future
metal-free,
suitable
organic
reactions.
Asian Journal of Organic Chemistry,
Journal Year:
2024,
Volume and Issue:
13(2)
Published: Jan. 2, 2024
Abstract
We
present
a
green
and
efficient
approach
for
synthesizing
vicinal
diols
via
metal‐free
photocatalyzed
pinacol
coupling
reaction
in
water
or
aqueous
media.
The
mild
practical
conditions,
including
commercially
available
organic
photocatalyst
nontoxic
solvent,
provide
wide
functional
group
tolerance
while
furnishing
the
corresponding
high
yields.
Mechanistic
studies
reveal
crucial
role
of
Hantzsch
ester
(HEH),
which
undergoes
single‐electron
oxidation
subsequently
acts
as
proton
donor
to
aldehydes
proton‐coupled
electron
transfer
(PCET).
This
work
contributes
development
environmentally
friendly
methodologies
carbon−carbon
bond
formation,
aligning
with
principles
sustainable
chemistry.
Chemistry - A European Journal,
Journal Year:
2024,
Volume and Issue:
30(22)
Published: Feb. 12, 2024
Herein,
BPC
catalyzed
visible-light-triggered
target-specific
late-stage
solution
phase
desulfonylation
from
tryptophan
in
oligopeptides
is
portrayed
by
overcoming
the
isolation
issue
up
to
octamers.
This
robust
and
mild
method
highly
predictable
chemoselective,
tolerating
myriad
of
functional
groups
aza-heteroaromatics
peptides.
Interestingly,
reductive
also
amenable
biologically
significant
reactive
histidine
tyrosine
side
chains,
signifying
versatility
strategy.
Additional
efficacy
demonstrated
phenacyl
deprotection
C-terminal
Furthermore,
excellent
catalyst
loading
0.5
mol%
recyclability
demonstrate
practical
utility
applicability
this
The Journal of Organic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
The
pinacol
coupling
is
a
significant
method
for
carbon–carbon
bond
formation.
Here,
we
present
an
efficient
electrochemical
approach
of
aldehydes
and
ketones
using
TMSN3
as
sacrificial
reagent.
This
exhibits
broad
applicability
to
aryl,
heteroaryl,
alkyl
aldehydes/ketones
with
excellent
chemo-selectivity
high
yields
(40
examples,
up
99%
yield)
under
mild
conditions.
can
also
be
applied
in
the
selective
reduction
phthalimides
hydroxyl
lactams
good
yields.
proposed
mechanism
was
elucidated
by
control
experiments
cyclic
voltammetry.
