Oxygen-Dependent Ligand-Controlled Iron-Catalyzed Chemoselective Synthesis of Olefins and Vinyl Nitriles
Organic Letters,
Год журнала:
2024,
Номер
26(13), С. 2540 - 2545
Опубликована: Март 28, 2024
An
oxygen-dependent
ligand-controlled
chemoselective
synthesis
of
vinyl
nitriles
and
E-olefins
by
coupling
a
variety
alcohols
benzyl
cyanides,
catalyzed
well-characterized,
air-stable,
easy-to-prepare
Fe(II)
catalyst
(1a)
bearing
redox-active
arylazo
pincer
(L1a)
is
reported.
The
azo-moiety
the
ligand
backbone
acts
as
an
electron
hydrogen
reservoir,
enabling
1a
to
efficiently
produce
broad
spectrum
in
moderate
good
yields
selectively
under
oxygen
argon
atmosphere,
respectively.
Язык: Английский
Utilization of ruthenium(0) for σ-bond activation: Formation of organoruthenium complexes and emergence of their catalytic activity via in situ Ru-C bond cleavage
Journal of Organometallic Chemistry,
Год журнала:
2025,
Номер
unknown, С. 123567 - 123567
Опубликована: Фев. 1, 2025
Язык: Английский
Microwave‐Assisted Metal‐Free C─N Coupling for The Synthesis of Common Ligand Precursors of Organometallic Complexes
ChemistrySelect,
Год журнала:
2025,
Номер
10(19)
Опубликована: Май 1, 2025
Abstract
This
study
presents
a
microwave‐assisted,
metal‐free
approach
for
the
fast
and
selective
synthesis
of
pyridine‐functionalized
N
‐heterocyclic
ligand
precursors.
Efficient
synthetic
methods
are
important
in
development
cost‐effective
transition
metal
complexes
commonly
used
as
catalysts
various
applications.
Traditional
forming
C–N
C–C
bonds
require
long
reaction
times
harsh
conditions,
whereas
microwave
heating
accelerates
by
significantly
reducing
time
temperature,
under
metal‐
additive‐free
conditions.
has
enabled
mono‐
di‐substituted
pyridine‐based
synthons
starting
from
2,6‐dibromopyridine
well
2,6‐dichloropyridine.
The
also
applies
to
other
substrates,
delivering
high‐purity
ligands
5–15
min.
Notably,
this
method
provides
an
alternative
cross‐coupling
reactions,
eliminating
requirement
copper
catalysts,
more
sustainable
efficient
conventional
strategies.
prepared
using
microwave‐assisted
reported
here
have
been
utilized
prepare
some
common
preparation
organometallic
complexes.
Язык: Английский
Room Temperature Transfer Hydrogenation of Aldehydes Using Methanol Catalyzed by Iridium(III) Pyridylidene-Indole Complex
Sandip Bapu Khatal,
Manohar Shivaji Padmor,
Megha Mariet
и другие.
Chemical Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
An
air-
and
moisture-stable
(L)Ir(
iii
)Cp*
catalyst
with
electron-rich
pyridylidene–indole
ligands
enables
efficient,
selective
transfer
hydrogenation
of
aldehydes
to
alcohols
using
methanol
at
low
temperatures
(10–25
°C).
Язык: Английский
Base-controlled NHC-Ru-catalyzed transfer hydrogenation and α-methylation/transfer hydrogenation of ketones using methanol
Chinese Chemical Letters,
Год журнала:
2023,
Номер
35(7), С. 109323 - 109323
Опубликована: Ноя. 19, 2023
Язык: Английский
Microwave-assisted Transfer Hydrogenation of Carbonyl and Nitro Compounds by Bimetallic Ru(II) cymene Complexes
Synlett,
Год журнала:
2024,
Номер
unknown
Опубликована: Март 25, 2024
Abstract
We
report
an
investigation
of
the
microwave-assisted
catalytic
transfer
hydrogenation
(TH)
carbonyl
and
nitro
compounds
by
employing
Ru(II)
complexes:
bimetallic
[(p-cymene)2(RuCl)2L1]2X
(X
=
BF4
(Cat2);
X
PF6
(Cat3))
mononuclear
[(p-cymene)(RuCl)L2]BF4
(Cat4)
(where
L1
N,N′-(3,3′,5,5′-tetraisopropyl-[1,1′-biphenyl]-4,4′-diyl)bis(1-(pyridin-2-yl)methanimine)
L2
N-(2,6-diisopropylphenyl)-1-(pyridin-2-yl)methanimine).
At
a
low
catalyst
loading
0.01
mol%
(Cat2/Cat3),
broad
range
substrates,
comprising
aromatic
as
well
aliphatic
ketones
aldehydes,
undergo
TH
reaction
in
short
time
just
10
minutes.
Additionally,
chemoselective
nitroaromatic
is
achieved
under
microwave
irradiation
presence
Cat2
within
5
Control
experiments
demonstrate
that
heating
conditions
outperform
conventional
terms
improved
activity
efficiency.
The
used
at
very
0.001
to
achieve
high
TONs
TOFs
7.7
×
104
2.3
105
h–1,
respectively,
for
reaction.
Spectrometry
involving
trapping
intermediates
are
propose
mechanism
compounds.
Язык: Английский
Ruthenium catalyzed dehydrogenative α-C–H functionalization of β-naphthol using alcohols: a metal–ligand cooperative borrowing hydrogen approach
Catalysis Science & Technology,
Год журнала:
2024,
Номер
14(12), С. 3540 - 3549
Опубликована: Янв. 1, 2024
Chemoselective
α-C–H
functionalization
of
β-naphthol
is
achieved
with
inexpensive
and
readily
available
alcohols
using
a
well-defined,
air-stable,
easy-to-prepare
Ru(
ii
)-catalyst
(1a)
bearing
redox-active
tridentate
pincer
(
L
1a).
Язык: Английский
Methanol for Hydrogenation and Methylation of Carbonyls: Advances and Challenges in Homogeneous Catalysis
Synlett,
Год журнала:
2024,
Номер
35(20), С. 2346 - 2366
Опубликована: Окт. 18, 2024
Abstract
The
catalytic
dehydrogenation
of
methanol
to
give
formaldehyde
or
formic
acid,
followed
transfer
hydrogenation
and/or
tandem
(de)hydrogenation
for
the
and
C-methylation
carbonyls,
offers
advantages
over
traditional
methods,
including
milder
reaction
conditions,
improved
safety,
greater
selectivity,
enhanced
sustainability.
This
account
provides
a
comprehensive
overview
homogeneous
catalysts
reported
various
substrates,
ketones,
chalcones,
esters,
amides,
using
as
both
hydrogen
donor
methylation
source.
We
provide
specific
examples
mechanistic
insights
each
strategy,
offering
thorough
concise
recent
advancements
from
2014
2024.
1
Introduction
2
Methanol
Activation
Strategies
3
Hydrogenation
Carbonyls
4
Methylation
5
Outlook
Summary
Язык: Английский