Recent advances in the selective semi-hydrogenation of alkyne to (E)-olefins
Motahar Sk,
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Shuvojit Haldar,
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Sourajit Bera
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et al.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
60(12), P. 1517 - 1533
Published: Jan. 1, 2024
This
article
highlights
the
recent
advances
on
newer
technologies
and
important
methodologies
directed
to
(
E
)-olefins
from
alkynes.
Language: Английский
Reaction sites optimization mediated by ligand coverage for semi‐hydrogenation of different alkynes
Zhongzhe Wei,
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Songtao Huang,
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Jiayuan Li
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et al.
AIChE Journal,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 9, 2025
Abstract
Precise
regulation
of
catalysts
active
sites
is
the
key
to
optimizing
activity.
In
this
work,
a
strategy
for
modulating
alkyne
adsorption
by
modifying
support
proposed.
A
series
Pd/ZSM‐5@PPh
3
‐X
with
different
coverage
triphenylphosphine
(PPh
)
were
synthesized.
enable
efficient
semi‐hydrogenation
alkynes
under
mild
conditions.
Specifically,
catalyst
lower
surface
ligand
(Pd/ZSM‐5@PPh
‐2)
exhibits
preference
hydrogenation
2‐methyl‐3‐butyn‐2‐ol,
while
higher
‐10)
favors
conversion
phenylacetylene.
Both
maintain
an
alkene
selectivity
exceeding
94%.
Comprehensive
experimental,
characterization,
and
computational
analyses
revealed
that
which
adsorbs
on
palladium
surface,
PPh
inhibits
strong
alkynes,
thereby
preventing
self‐poisoning.
Conversely,
high
redirects
site
phenylacetylene
enhanced
hydrogen
spillover
accelerates
reaction.
This
ligand‐modulated
offers
guidance
rational
design
chemoselective
catalysts.
Language: Английский
Renaissance in Alkyne Semihydrogenation: Mechanism, Selectivity, Functional Group Tolerance, and Applications in Organic Synthesis
Chemical Reviews,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 25, 2025
Alkenes
constitute
a
significant
class
of
chemical
compounds
with
applications
in
the
bulk,
pharmaceutical,
or
perfume
industry.
Among
known
methods
olefin
production,
semihydrogenation
C-C
triple
bond
seems
to
be
most
straightforward
one.
Nonetheless,
success
this
reaction
requires
full
control
over
diastereoselectivity,
eradication
parasitic
process
over-reduction
migration
double
formed,
and
achieving
satisfactory
functional-group
compatibility.
The
review
demonstrates
developments
field
alkyne
period
2010-2022,
selected
papers
published
2023
2024,
emphasizing
solutions
above-mentioned
limitations.
We
discuss
mechanistic
aspects
transformation,
including
those
related
unconventional
systems.
includes
examples
organic
synthesis,
confirming
considerable
utility
process.
Finally,
strategies
enhance
catalyst
selectivity
are
summarized.
For
reader's
convenience,
we
provided
graphical
guidebook
catalytic
systems,
illustrating
efficiency
particular
method.
Language: Английский
Chloride, Alkoxide, or Silicon: The Bridging Ligand Dictates the Spin State in Dicobalt Expanded Pincer Complexes
Organometallics,
Journal Year:
2024,
Volume and Issue:
44(1), P. 94 - 104
Published: Nov. 28, 2024
We
report
the
synthesis
and
characterization
of
a
series
high-
low-spin
dicobalt
complexes
tBuPNNP
expanded
pincer
ligand.
Reacting
this
dinucleating
ligand
in
its
neutral
form
with
two
equiv
CoCl2(tetrahydrofuran)1.5
yields
high-spin
complex
featuring
one
Co
inside
outside
pocket.
Performing
same
reaction
presence
equivalents
KOtBu
provides
access
to
wherein
both
centers
are
bound
within
PNNP
pocket,
also
features
bridging
OtBu
either
excess
diethyl
silane
affords
containing
unusual
Si-based
ligands.
These
were
investigated
using
NMR
spectroscopy,
XAS,
single
crystal
X-ray
structure
determination,
computational
methods,
showing
that
ligands
best
described
as
base-stabilized
silylenes.
Language: Английский
E‐selective Semi‐hydrogenation of Alkynes under Mild Conditions by a Diruthenium Hydride Complex
Chemistry - A European Journal,
Journal Year:
2022,
Volume and Issue:
28(69)
Published: Aug. 18, 2022
The
synthesis,
characterization
and
catalytic
activity
of
a
new
class
diruthenium
hydrido
carbonyl
complexes
bound
to
the
Language: Английский
Reversible Bimetallic Inhibition to Modulate Selectivity During Catalysis
Emmanuel Serrano-Díez,
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Alejandra Pita‐Milleiro,
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Jesús Rangel-García
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et al.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 23, 2024
Bimetallic
complexes
have
demonstrated
a
great
ability
to
enhance
the
activity
of
monometallic
systems
for
bond
activation
and
catalysis.
In
this
work,
we
explore
opposite
approach:
using
second
metal
passivate
another
by
reversible
bimetallic
inhibition.
To
do
so
synthesized
family
nine
electrophilic
gold
formula
Au(PR
Language: Английский
Synthesis, spectroscopic characterization, crystal structure, DFT and Hirschfeld surface analysis of a manganese(I) complex ([Mn(P-NH-NH-P)(CO)2][BPh4])
Madeleine O. Sattler,
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Tomilola J. Ajayi,
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Eric C. Keske
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et al.
Journal of Molecular Structure,
Journal Year:
2023,
Volume and Issue:
1291, P. 136028 - 136028
Published: June 15, 2023
Language: Английский
Superior electrocatalytic hydrogen evolution activity of a triply bridged diruthenium(II) complex on carbon cloth support
Yogita Arya,
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Toufik Ansari,
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Sudip Kumar Bera
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et al.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
60(47), P. 6011 - 6014
Published: Jan. 1, 2024
This
article
describes
the
structural
authentication
of
a
unique
triply
bridged
[1](ClO
Language: Английский
Ruthenium, copper and ruthenium-copper complexes of an unsymmetrical phosphino pyridyl 1,8-naphthyridine PNNN ligand
Dalton Transactions,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
A
new
unsymmetrical
dinucleating
PNNN
ligand
is
reported,
the
versatility
of
which
demonstrated
by
formation
heterobimetallic,
homobimetallic
and
monometallic
complexes.
Language: Английский