Copper-catalyzed C–C bond cleavage coupling with C N bond formation toward mild synthesis of lignin-based benzonitriles
Journal of Environmental Sciences,
Год журнала:
2024,
Номер
151, С. 505 - 515
Опубликована: Март 27, 2024
Язык: Английский
Synthesis of Cyano-Containing Epoxy Precursor from Vanillin for Engineering Multifaceted Performance-Enhancing Resins
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(26), С. 9528 - 9539
Опубликована: Июнь 15, 2023
Interest
in
producing
chemicals
and
thermosets
from
sustainable
resources
is
growing,
yet
their
moderate
performance
drastically
undermines
potential
applicability.
Herein,
an
aryl
dinitrile
epoxy
precursor
(DVN-EP)
was
developed
vanillin.
After
curing
with
4,4′-diaminodiphenyl
sulfone
(DDS),
cyano-containing
resin
(DVN-EP/DDS)
produced
eminent
comprehensive
properties
on
account
of
the
dual-cross-linked
network
formed
by
epoxy-amine
reaction
further
cyclotrimerization
cyano
groups.
In
particular,
glass
transition
temperature,
storage
modulus,
char
yield
(at
800
°C
N2),
Young's
modulus
DVN-EP/DDS
were
201
°C,
2795
MPa,
47.4%,
5034
respectively,
all
much
higher
than
those
cyano-free
counterpart
(DMG-EP/DDS).
Moreover,
dipole–dipole
pairings
combined
H-bonding
interactions
contributed
to
a
tremendously
increased
lap
shear
strength
up
7.18
MPa
as
well
good
energy
dissipation
damping
capacity.
The
rationally
designed
strengthening
mechanism
reported
here
offers
important
universal
strategy
for
significantly
enhancing
thermosets.
Язык: Английский
Fe-Catalyzed Direct Synthesis of Nitriles from Carboxylic Acids with Electron-Deficient N-Cyano-N-aryl–arylsulfonamide
Organic Letters,
Год журнала:
2023,
Номер
25(6), С. 917 - 922
Опубликована: Фев. 2, 2023
Established
carboxylic
acids
to
nitriles
conversion
methods
suffer
from
expensive
catalysts,
tedious
steps,
high
temperatures
(>200
°C),
pressure,
or
a
narrow
substrate
range.
Herein,
we
demonstrate
concise
and
efficient
access
diverse
nitrile
compounds
ubiquitous
with
electron-deficient
N-cyano-N-aryl-arylsulfonamide
(NCAS)
in
moderate
excellent
yields.
This
strategy
is
promoted
by
an
inexpensive
iron
catalyst
generally
compatible
primary,
secondary,
tertiary,
aryl
acids,
as
well
variety
of
functional
groups.
Язык: Английский
Synthesis of Aryl Nitriles via Aerobic Oxidative Cleavage of Aryl C=C Bonds with (NH4)2CO3 as the Nitrogen Source
Synlett,
Год журнала:
2022,
Номер
33(04), С. 376 - 380
Опубликована: Янв. 18, 2022
Abstract
An
aerobic
oxidative
method
was
developed
for
conversion
of
arylethenes
to
aromatic
nitriles
using
(NH4)2CO3
as
the
nitrogen
source
and
Cu(NO3)2
catalyst.
The
present
allowed
a
series
underwent
cleavage
C=C
bonds
give
targeted
products
in
low
high
yields.
In
addition,
conditions
are
compatible
with
many
groups
such
alkyl,
alkoxy,
N,N-dimethylamino,
chloro,
bromo,
iodo,
ester,
cyano
group,
so
on.
Язык: Английский
Catalyst‐Free Hydrogenolysis of Lignin β‐O‐4 Ketone Models with Water as an H‐transfer Reagent
ChemistrySelect,
Год журнала:
2023,
Номер
8(14)
Опубликована: Апрель 7, 2023
Abstract
It
was
found
that
lignin
β
‐O‐4
ketone
models
could
undergo
smoothly
the
hydrogenolysis
via
light‐induced
water‐donating
transfer
hydrogenation,
which
provides
an
example
of
using
inexpensive
and
eco‐friendly
water
as
H‐transfer
reagent
to
enable
under
catalyst‐free
condition.
Preliminary
mechanistic
investigations
suggest
pathway
involves
formation
acetophenone
radicals.
Язык: Английский
Light‐Induced Vicinal Dichlorination of Alkenes Using FeCl3 as the Dichlorination Reagent
ChemistrySelect,
Год журнала:
2024,
Номер
9(6)
Опубликована: Фев. 7, 2024
Abstract
We
report
a
ligand‐to‐metal
charge‐transfer
(LMCT)
process
that
used
ferric
(III)
chloride
as
efficient
chlorination
reagent
to
mediate
the
vicinal
dichlorination
of
alkenes.
Under
420
nm
LED
light,
easily
available
and
safe
could
facilitate
various
alkenes
transform
1,2‐dichloride
compounds
with
good
excellent
yields
(19
examples).
The
strategy
showed
more
economic
protocol
than
CuCl
2
,
provided
significant
reference
for
light‐Induced
in
industrial
catalysis.
Язык: Английский