Catalysts,
Год журнала:
2024,
Номер
15(1), С. 16 - 16
Опубликована: Дек. 28, 2024
Palladium
(Pd)
is
a
4d
transition
metal
with
electronic
configuration
[Kr]
4d10
5s0,
and
it
one
of
the
most
widely
studied
metals
in
periodic
table
due
to
its
versatile
catalytic
role
organic
synthesis.
The
choice
ligands
that
can
coordinate
Pd
sites
plays
crucial
progress
reaction.
Due
coexistence
multiple
oxidation
states
(Pd(0)/Pd(II)),
active
catalysts
participate
various
stages
coupling
Pd-catalyzed
C-C
reactions
proceed
through
four
steps:
(1)
oxidative
addition
reactant
site,
(2)
transmetallation,
(3)
rearrangements
ligand
centers
(4)
reductive
elimination
products.
For
heterogeneous
nanocatalysts,
are
often
strongly
bound
(chelated)
solid
catalyst
surfaces.
In
this
review,
we
have
highlighted
advancements
made
nanocatalysts
an
emphasis
on
types
different
classes
porous
solids,
which
could
ligate
via
strong
covalent
bonds.
high
specific
surface
areas
small
these
provide
larger
number
thus
facilitate
Mechanistic
aspects
cross-coupling
discussed
context
structure–reactivity
relationship.
Green Chemistry,
Год журнала:
2024,
Номер
26(13), С. 7579 - 7655
Опубликована: Янв. 1, 2024
In
this
review
paper,
recent
developments
of
iron
oxide
nanoparticles
are
highlighted
and
discussed
in
the
field
organic
catalysis
environmental
remediation.
Abstract
The
continuous
development
of
advanced
catalysts
to
increase
process
yield
and
selectivity
is
crucial.
A
high
specific
surface
area
a
good
active
phase
dispersion
are
generally
essential
create
catalytic
materials
with
large
number
sites.
Notably,
fibrous
morphology
appealing
because
their
surface‐to‐volume
ratio
flexibility.
This
contribution
highlights
the
different
types
structures
currently
under
investigation,
all
way
from
nanoscale
macroscale
back,
where
distinction
lies
in
length
diameter
fibers,
as
well
connection
between
structures.
Fibers
at
least
one
submicron
characteristic
result
higher
yield,
but
can
display
practical
usability
issues
when
unbound.
Therefore,
structure
balance
small
handleability
important
for
industrial
viability.
By
combining
morphologies,
best
both
nanomaterials
macroscopic
integer
be
combined
into
materials.
overview
showcases
potential
these
makes
clear
that
further
research
needed
keep
expanding
use
effectiveness
catalysis.
Catalysis Science & Technology,
Год журнала:
2024,
Номер
14(11), С. 3176 - 3183
Опубликована: Янв. 1, 2024
The
development
of
palladium-catalyzed
cross-coupling
reactions
has
been
revolutionized
by
bimetallic
co-catalysis
and
magnetic
separation
techniques,
which
address
the
dual
challenges
reducing
reliance
on
palladium
(Pd)
advancing
sustainable
chemistry
practices.
Chemistry - A European Journal,
Год журнала:
2024,
Номер
30(27)
Опубликована: Фев. 29, 2024
Abstract
Immobilized
Pd‐catalyzed
Suzuki‐Miyaura
coupling
under
continuous‐flow
conditions
using
a
packed‐bed
reactor,
representing
an
efficient,
automated,
practical,
and
safe
technology
compared
to
conventional
batch‐type
reactions.
The
core
objective
of
this
study
is
the
development
active
durable
catalyst.
In
contrast
supported
Pd
nanoparticles,
attachment
complexes
onto
solid
supports
through
well‐defined
coordination
sites
considered
favorable
approach
for
preparing
highly
dispersed
stabilized
species.
These
species
can
be
directly
employed
in
various
flow
reactions
without
need
pre‐treatment.
This
concept
paper
explores
recent
achievements
involving
application
immobilized
as
precatalysts
coupling.
Our
focus
elucidate
significance
designed
catalyst
structures
relation
their
catalytic
performance
conditions.
Additionally,
we
highlight
reaction
systems
packing
methods,
emphasizing
crucial
roles
establishing
practical
synthesis
process.
RSC Advances,
Год журнала:
2024,
Номер
14(29), С. 20837 - 20855
Опубликована: Янв. 1, 2024
Porphyrin-based
POPs
obtained
via
the
Alder–Longo
method
are
reviewed
in
this
work
from
aspects
of
their
design,
preparation,
and
applications
as
well
challenges
opportunities
for
future
development.
Abstract
Aryl
bromides
and
4‐chlorotoluene
as
an
example
aryl
chloride
in
the
presence
of
N
‐heterocyclic
carbene
(NHC)
palladium
hydroxo
dimers
type
[{Pd(μ‐OH)Cl(NHC)}
2
]
(where
NHC=IPr,
SIPr,
IMes,
SIMes)
undergo
efficient
selective
Sonogashira
cross‐coupling
with
(hetero)arylacetylenes.
The
procedure
allows
high‐throughput
synthesis
a
broad
spectrum
1,2‐diarylacetylenes
using
10
ppm
[{Pd(μ‐OH)Cl(IPr)}
precatalyst.
For
coupling
phenylacetylene,
TON=560000
was
achieved.
Hydrogen
observed
product
reaction.
formation
active
Pd(0)
from
Pd(II)
complex
found
to
proceed
via
ethanol
oxidation.
Mechanistic
studies
showed
that
water
plays
key
role
Chemistry - A European Journal,
Год журнала:
2023,
Номер
30(8)
Опубликована: Ноя. 29, 2023
Abstract
Phosphine
periodic
mesoporous
organosilicas
(R‐P‐PMO‐TMS:
R=Ph,
t
Bu),
which
possess
electron‐donating
alkyl
substituents
on
the
phosphorus
atom,
were
synthesized
using
bifunctional
compounds
with
alkoxysilyl‐
and
phosphino
groups,
bis[3‐(triethoxysilyl)propyl]phenylphosphine
borane
(
1
a
)
bis[3‐(triethoxysilyl)propyl]‐
tert
‐butylphosphine
b
).
Immobilization
of
Pd(0)
species
was
performed
to
give
R‐P‐Pd‐PMO‐TMS:
R=Ph
2
),
Bu
3
respectively.
The
immobilized
applicable
as
catalysts
for
Suzuki‐Miyaura
cross‐coupling
reactions
aryl
chlorides
phenylboronic
acid.
It
revealed
that
bearing
more
groups
exhibited
higher
catalytic
activity.
Various
functional
including
both
electron
withdrawing
donating
compatible
in
system.
recyclability
examined
support
its
moderate
utility
recycle
use.
