Chemistry - A European Journal,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 27, 2024
Vinylaziridines
are
important
building
blocks
in
organic
chemistry,
especially
the
synthesis
of
nitrogen-containing
heterocycles.
The
direct
and
efficient
transfer
an
appropriate
nitrogen
source
to
readily
accessible
conjugated
dienes
is
a
notable
methodology.
Pd-catalyzed
oxidative
1,2-difunctionalization
through
π-allyl-palladium
species
should
be
ideal
method
for
selective
vinylaziridines.
However,
this
faces
challenge
regioselectivity,
often
resulting
1,4-difunctionalization
instead.
In
study,
we
developed
aerobic
via
achieve
regio-,
site-
stereo-selective
aziridination
under
synergistic
effects
Pd
Advanced Materials,
Год журнала:
2024,
Номер
36(25)
Опубликована: Март 18, 2024
Abstract
Petroleum,
as
the
“lifeblood”
of
industrial
development,
is
important
energy
source
and
raw
material.
The
selective
transformation
petroleum
into
high‐end
chemicals
great
significance,
but
still
exists
enormous
challenges.
Single‐atom
catalysts
(SACs)
with
100%
atom
utilization
homogeneous
active
sites,
promise
a
broad
application
in
petrochemical
processes.
Herein,
research
systematically
summarizes
recent
progress
SACs
catalytic
reaction,
proposes
role
structural
design
enhancing
performance,
elucidates
reaction
mechanisms
conversion
processes,
reveals
high
activity
origins
at
atomic
scale.
Finally,
key
challenges
are
summarized
an
outlook
on
design,
identification
appropriate
artificial
intelligence
technology
provided
for
achieving
scale‐up
process.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(41)
Опубликована: Авг. 23, 2023
An
iridium-catalyzed
remote
site-switchable
hydroarylation
of
alkenes
was
reported,
delivering
the
products
functionalized
at
subterminal
methylene
and
terminal
methyl
positions
on
an
alkyl
chain
controlled
by
two
different
ligands,
respectively,
in
good
yields
with
to
excellent
site-selectivities.
The
catalytic
system
showed
functional
group
tolerance
a
broad
substrate
scope,
including
unactivated
activated
alkenes.
More
importantly,
regioconvergent
transformations
mixtures
isomeric
were
also
successfully
realized.
results
mechanistic
studies
demonstrate
that
reaction
undergoes
chain-walking
process
give
[Ar-Ir-H]
complex
alkene.
subsequent
processes
proceed
through
modified
Chalk-Harrod-type
mechanism
via
migratory
insertion
alkene
into
Ir-C
bond
followed
C-H
reductive
elimination
afford
hydrofunctionalization
site-selectively.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 15, 2024
A
Pd-catalyzed
asymmetric
isomerization-hydroamidocarbonylation
of
amide-containing
alkenes
was
developed,
affording
a
variety
chiral
α-alkyl
succinimides
in
moderate
to
good
yields
with
high
enantioselectivities.
The
key
success
introducing
bulky
1-adamentyl
P-substitution
and
2,3,5,6-tetramethoxyphenyl
group
into
the
rigid
P-chirogenic
bisphosphine
ligand
create
stronger
steric
hinderance
deeper
catalytic
pocket.
By
this
approach,
regio-
or
stereo-convergent
synthesis
enantiomeric
from
mixture
olefin
isomers
achieved.
Macromolecules,
Год журнала:
2024,
Номер
57(15), С. 7565 - 7574
Опубликована: Авг. 2, 2024
Ethylene-propylene
rubber
(EPM)
efficiently
and
reversibly
cross-linked
by
boronic
acid
functionalities
was
developed.
The
introduction
of
acids
into
EPM
achieved
the
direct
terpolymerization
alkenylboronic
comonomers
masked
with
1,8-diaminonaphthalene
(dan)
ethylene
propylene.
Cross-linking
thermal
dehydration–condensation
can
significantly
proceed
above
80
°C,
indicated
IR
NMR
spectroscopy
viscoelastic
measurements
terpolymer
immediately
after
isolation.
An
efficient
cross-linking
behavior
is
swelling
test
mechanical
property
molded
sample.
Generally,
boron-cross-linked
showed
higher
tensile
strength
than
sulfur-vulcanized
ethylene-propylene-diene
(EPDM)
a
amount
reagent.
de-cross-linking
boron
moiety
in
alcoholysis
using
chelating
reagent
like
N-methyl
diethanolamine.
completion
reaction
led
to
being
soluble
toluene,
showing
that
most
boroxine
points
were
cleaved
short
time.
novel
reversible
would
be
candidate
alternative
conventional
vulcanized
rubber,
enabling
development
closed-loop
process
material
recycling.
Organic Chemistry Frontiers,
Год журнала:
2023,
Номер
10(5), С. 1128 - 1133
Опубликована: Янв. 1, 2023
The
bis(pentafluorophenyl)borane-catalyzed
E
-selective
isomerization
of
terminal
alkenes
to
internal
via
a
hydroboration/retro-hydroboration
sequence
is
reported.
Angewandte Chemie,
Год журнала:
2023,
Номер
135(41)
Опубликована: Авг. 23, 2023
Abstract
An
iridium‐catalyzed
remote
site‐switchable
hydroarylation
of
alkenes
was
reported,
delivering
the
products
functionalized
at
subterminal
methylene
and
terminal
methyl
positions
on
an
alkyl
chain
controlled
by
two
different
ligands,
respectively,
in
good
yields
with
to
excellent
site‐selectivities.
The
catalytic
system
showed
functional
group
tolerance
a
broad
substrate
scope,
including
unactivated
activated
alkenes.
More
importantly,
regioconvergent
transformations
mixtures
isomeric
were
also
successfully
realized.
results
mechanistic
studies
demonstrate
that
reaction
undergoes
chain‐walking
process
give
[Ar−Ir−H]
complex
alkene.
subsequent
processes
proceed
through
modified
Chalk–Harrod‐type
mechanism
via
migratory
insertion
alkene
into
Ir−C
bond
followed
C−H
reductive
elimination
afford
hydrofunctionalization
site‐selectively.
Organic Letters,
Год журнала:
2024,
Номер
26(32), С. 6835 - 6840
Опубликована: Авг. 7, 2024
There
are
only
a
few
examples
being
reported
for
the
simultaneous
control
of
central
chirality
and
axial
because
it
is
more
challenging.
Herein,
we
report
an
iridium-catalyzed
asymmetric
hydroarylation
unactivated
alkenes
with
heterobiaryls
to
simultaneously
construct
chirality.
The
reaction
showed
broad
substrate
scope
delivered
products
satisfactory
results.
results
experiments
demonstrated
that
FerroLANE
ligand
promotes
proceed
along
specific
modified
Chalk-Harrod
mechanism.
An
effective
path
for
acid-catalyzed
regioselective
remote
heteroarylation
and
reductive
alkylation
of
alkenes
is
reported,
which
exhibits
excellent
functional
group
compatibility,
regioselectivity,
practicality
potential
applications.
