Chemistry & Chemical Technology,
Год журнала:
2025,
Номер
19(1), С. 34 - 51
Опубликована: Март 25, 2025
Hydrogen
peroxide
(H2O2)
is
a
versatile
oxidant
used
in
various
chemical
syntheses,
including
the
selective
oxidation
of
organic
compounds
and
conversion
pollutants
wastewater.
The
increasing
interest
H2O2
as
“green
oxidant”
largely
due
to
environmental
considerations
assigned
clean
nature
hydrogen
an
because
its
by-product
only
water.
selected
catalytic
processes
sulfide
oxidation,
method
for
production
valuable
chemicals,
well
potential
crude
oil
desulfurization
are
presented
discussed.
Special
attention
paid
Ti-based
systems
these
processes.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(31)
Опубликована: Май 6, 2023
Abstract
Mimicking
the
active
site
and
substrate
binding
cavity
of
enzyme
to
achieve
specificity
in
catalytic
reactions
is
an
essential
challenge.
Herein,
porous
coordination
cages
(PCCs)
with
intrinsic
cavities
tunable
metal
centers
have
proved
regulation
reactive
oxygen
species
(ROS)
generating
pathways
as
evidenced
by
multiple
photo‐induced
oxidations.
Remarkably,
presence
Zn
4
‐μ
‐O
center,
PCC
converted
dioxygen
molecules
from
triplet
singlet
excitons,
whereas
Ni
center
promoted
efficient
dissociation
electrons
holes
conduct
electron
transfer
towards
substrates.
Accordingly,
distinct
ROS
generation
behavior
PCC‐6‐Zn
PCC‐6‐Ni
enables
conversion
O
2
1
⋅
−
,
respectively.
In
contrast,
Co
combined
together
generate
carbonyl
radicals,
which
turn
reacted
molecules.
Harnessing
three
activation
pathways,
PCC‐6‐M
(M=Zn/Ni/Co)
display
specific
activities
thioanisole
oxidation
(
),
benzylamine
coupling
aldehyde
autoxidation
PCC‐6‐Co
).
This
work
not
only
provides
fundamental
insights
into
a
supramolecular
catalyst
but
also
demonstrates
rare
example
achieving
reaction
through
mimicking
natural
enzymes
PCCs.
Although
the
introduction
of
plastics
has
improved
humanity's
everyday
life,
fast
accumulation
plastic
waste,
including
microplastics
and
nanoplastics,
have
created
numerous
problems
with
recent
studies
highlighting
their
involvement
in
various
aspects
our
lives.
Upcycling
plastics,
conversion
waste
to
high-added
value
chemicals,
is
a
way
combat
that
receiving
increased
attention.
Herein,
we
describe
novel
aerobic
photochemical
process
for
upcycling
real-life
polystyrene-based
into
benzoic
acid.
A
new
employing
thioxanthone-derivative,
combination
N-bromosuccinimide,
under
ambient
air
390
nm
irradiation
capable
polystyrene-derived
products
acid
yields
varying
from
24-54
%.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(37), С. 25799 - 25812
Опубликована: Сен. 3, 2024
Photocatalysis
holds
great
promise
for
changing
the
way
value-added
molecules
are
currently
prepared.
However,
many
photocatalytic
reactions
suffer
from
quantum
yields
well
below
10%,
hampering
transition
lab-scale
to
large-scale
or
even
industrial
applications.
Molecular
dyads
can
be
designed
such
that
beneficial
properties
of
inorganic
and
organic
chromophores
combined,
resulting
in
milder
reaction
conditions
improved
reactions.
We
have
developed
a
novel
approach
obtaining
advantages
molecular
without
time-
resource-consuming
synthesis
these
tailored
photocatalysts.
Simply
by
mixing
cationic
ruthenium
complex
with
an
anionic
pyrene
derivative
water
salt
bichromophore
is
produced
owing
electrostatic
interactions.
The
long-lived
triplet
state
obtained
static
quantitative
energy
transfer
preorganized
complex.
exploited
this
so-called
Coulombic
dyad
catalysis
similar
reactivity
higher
photostability
compared
reference
photosensitizers
several
photooxygenations.
In
addition,
it
was
shown
system
also
used
maximize
yield
photoredox
This
due
intrinsically
cage
escape
after
photoinduced
electron
purely
compounds
heavy
atom-containing
molecules.
combination
laboratory-scale
as
mechanistic
irradiation
experiments
detailed
spectroscopic
investigations
provided
deep
insights
into
easy-to-use
photocatalyst
class.
Applied Catalysis A General,
Год журнала:
2023,
Номер
652, С. 119038 - 119038
Опубликована: Янв. 13, 2023
Chemoselective
oxidation
of
sulfides
to
sulfones
under
mild
conditions
is
relevant
for
industry,
but
challenging
owing
the
need
establish
catalysis
mechanisms
and
optimize
several
experimental
parameters.Herein,
we
report
synthesis
MWO
4
(M
=
Cd,
Co,
Cu,
Mn,
Ni,
Zn)
α-Ag
2
WO
semiconductors
as
efficient
selective
catalysts
this
transformation
in
darkness.This
catalytic
process
tolerant
a
broad
range
functionalized
substituted
even
presence
oxidative-sensitive
functional
groups.α-Ag
NiWO
were
most
with
good
selectivity,
stability,
yield
very
conditions.This
study
presents
distinctive
reaction
mechanism
process,
which
it
different
from
that
commonly
considered,
electron-hole
pairs
are
created
when
UV
light
shone.These
findings
open
pathway
processes
on
complete
darkness,
overcoming
limitation
light,
wide
applications.
European Journal of Organic Chemistry,
Год журнала:
2023,
Номер
26(13)
Опубликована: Фев. 17, 2023
Abstract
The
development
of
light‐mediated
methods
for
synthetic
applications
is
increasingly
attracting
high
interest.
We
present
herein
a
new
photochemical
protocol
the
synthesis
hydroxamic
acids,
which
constitute
an
important
class
medicinal
agents,
mainly
due
to
their
anticancer
properties.
method
mediated
by
UVA‐light
or
sunlight
and
its
key
point
generation
charge
transfer
complex
interaction
4‐dimethylaminopyridine
with
halomethane.
Various
carboxylic
acids
were
directly
coupled
O
‐protected
hydroxylamines,
upon
irradiation
either
LED
370
nm
solar
light.
A
detailed
study
mechanism
was
carried
out
employment
direct
infusion–high
resolution
mass
spectrometry
(DI‐HRMS),
providing
experimental
evidence
formation
various
activated
species,
may
lead
desired
product.
applied
in
drugs
Vorinostat
Bufexamac.
Chemistry - A European Journal,
Год журнала:
2024,
Номер
30(44)
Опубликована: Июнь 4, 2024
Abstract
Plastic
pollution
constitutes
an
evergrowing
urgent
environmental
problem,
since
overaccumulation
of
plastic
waste,
arising
from
the
immense
increase
production
disposable
products,
overcame
planet's
capacity
to
properly
handle
them.
Chemical
upcycling
polystyrene
a
convenient
method
for
conversion
waste
into
high‐added
value
chemicals,
suggesting
attractive
perspective
in
dealing
with
crisis.
We
demonstrate
herein
novel,
easy‐to‐perform
organocatalytic
photoinduced
aerobic
protocol,
which
proceeds
via
synergistic
indirect
hydrogen
atom
transfer
(HAT)
catalysis
under
LED
390
nm
Kessil
lamps
as
irradiation
source.
The
developed
employs
BrCH
2
CN‐thioxanthone
photocatalytic
system
and
was
successfully
applied
variety
everyday‐life
leading
isolation
benzoic
acid
after
simple
base‐acid
work
up
yields
varying
23–49
%,
while
large‐scale
experiment
performed,
that
step
is
susceptible
industrial
application.
