Nature Communications,
Journal Year:
2019,
Volume and Issue:
10(1)
Published: May 8, 2019
Aromatic
N-heterocyclic
compounds
are
very
important
chemicals,
which
currently
produced
mostly
from
petroleum.
Here
we
report
that
a
pyridazine-based
compound
6-(4-hydroxy-3-methoxyphenyl)pyridazin-3(2H)-one
(GSPZ)
can
be
efficiently
synthesized
by
the
Friedel-Crafts
reaction
of
guaiacol
and
succinic
anhydride,
both
derived
biomass.
GSPZ
is
then
treated
with
bio-based
epichlorohydrin
to
prepare
epoxy
resin
precursor
GSPZ-EP.
With
4,4'-diaminodiphenylmethane
as
curing
agent,
GSPZ-EP
possesses
higher
glass
transition
temperature
(187
oC
vs.
173
oC)
shows
140%,
70
93%
increase
in
char
yield
(in
N2),
storage
modulus
(30
Young's
modulus,
respectively
when
compared
standard
petroleum-based
bisphenol
A
resin.
Moreover,
cured
good
intrinsic
flame
retardancy
properties
close
V-0
rating
UL-94
test.
This
work
opens
door
for
production
aromatic
compounds,
biomass
employed
construct
high
performance
polymers.
ACS Catalysis,
Journal Year:
2017,
Volume and Issue:
7(11), P. 7456 - 7460
Published: Sept. 27, 2017
Herein,
we
present
the
base-metal-catalyzed
dehydrogenative
coupling
of
primary
alcohols
and
aromatic
diamines
to
selectively
form
functionalized
2-substituted
benzimidazoles,
liberating
water
hydrogen
gas
as
sole
byproducts.
The
reaction
is
catalyzed
by
pincer
complexes
Earth-abundant
cobalt
under
base-free
conditions.
ACS Catalysis,
Journal Year:
2018,
Volume and Issue:
8(9), P. 8525 - 8530
Published: Aug. 8, 2018
The
use
of
earth-abundant
transition
metals
as
a
noble
metal
replacement
in
catalysis
is
especially
interesting
if
different
catalytic
reactivity
observed.
We
report,
here,
on
the
selective
manganese-catalyzed
base-switchable
synthesis
N-alkylated
amines
or
imines.
In
both
reactions,
borrowing
hydrogen/hydrogen
autotransfer
(N-alkyl
amine
formation)
dehydrogenative
condensation
(imine
formation),
we
start
from
same
and
alcohols
Mn
precatalyst.
key
presence
potassium
base
to
prefer
N-alkylation
sodium
permit
imine
formation.
Both
bases
react
with
manganese
hydride
via
deprotonation.
manganate
reacts
about
40
times
faster
an
give
corresponding
than
hydride.
selectivity
seems
unique
for
complexes.
observe
broad
scope
complete
product
overlap,
all
alcohol
combinations
can
be
converted
into
N-alkyl
imine,
good
functional
group
tolerance.
Nature Energy,
Journal Year:
2022,
Volume and Issue:
7(5), P. 438 - 447
Published: May 19, 2022
Abstract
Efficient
hydrogen
storage
and
release
are
essential
for
effective
use
of
as
an
energy
carrier.
In
principle,
formic
acid
could
be
used
a
convenient
medium
via
reversible
CO
2
hydrogenation.
However,
noble
metal-based
catalysts
currently
needed
to
facilitate
the
(de)hydrogenation,
produced
during
is
generally
released,
resulting
in
undesirable
emissions.
Here
we
report
α
-amino
acid-promoted
system
hydrogenation
using
Mn-pincer
complex
homogeneous
catalyst.
We
observe
good
stability
reusability
catalyst
lysine
amino
at
high
productivities
(CO
hydrogenation:
total
turnover
number
2,000,000;
dehydrogenation:
600,000).
Employing
potassium
lysinate,
achieve
>80%
H
evolution
efficiency
>99.9%
retention
ten
charge–discharge
cycles,
avoiding
re-loading
steps
between
each
cycle.
This
process
was
scaled
up
by
factor
18
without
obvious
drop
productivity.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(11), P. 4386 - 4464
Published: Jan. 1, 2022
The
emerging
field
of
organometallic
catalysis
has
shifted
towards
research
on
Earth-abundant
transition
metals
due
to
their
ready
availability,
economic
advantage,
and
novel
properties.
In
this
case,
manganese,
the
third
most
abundant
transition-metal
in
Earth's
crust,
emerged
as
one
leading
competitors.
Accordingly,
a
large
number
molecularly-defined
Mn-complexes
been
synthesized
employed
for
hydrogenation,
dehydrogenation,
hydroelementation
reactions.
regard,
catalyst
design
is
based
three
pillars,
namely,
metal-ligand
bifunctionality,
ligand
hemilability,
redox
activity.
Indeed,
developed
catalysts
not
only
differ
chelating
atoms
they
possess
but
also
working
principles,
thereby
different
turnover
numbers
product
molecules.
Hence,
critical
assessment
molecularly
defined
manganese
terms
atoms,
reaction
conditions,
mechanistic
pathway,
significant.
Herein,
we
analyze
complexes
catalytic
activity,
versatility
allow
multiple
transformations
routes
convert
substrates
target
This
article
will
be
helpful
get
significant
insight
into
design,
aiding
design.
Coordination Chemistry Reviews,
Journal Year:
2021,
Volume and Issue:
443, P. 213967 - 213967
Published: May 24, 2021
Catalytic
dehydrogenation
of
alcohols
represents
an
attractive
approach
for
future
applications
as
hydrogen
storage
systems
and
clean
synthesis
fine
chemicals.
Herein,
overview
recent
progress
in
homogeneously
catalyzed
acceptorless
alcohol
is
presented.
In
Nature,
efficiently
by
multiple
metalloenzymes
where
a
non-noble
metal–ligand
interplay
key
to
activate
transform
substrate.
We
highlight
the
introduction
multifunctional
cooperative
ligands
coordination
sphere
metal
center
order
improve
catalytic
activity
under
photochemical,
electrochemical
or
thermal
conditions.
Moreover,
cooperativity
crucial
easy
transition
first
row
based
catalysis,
we
have
seen
years.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(10), P. 4094 - 4120
Published: Jan. 1, 2022
This
review
explores
and
summarises
synthetic
methods
that
may
be
used
to
prepare
heterocyclic
ring
systems
from
non-activated
ketones,
considers
their
potential
value
towards
the
synthesis
of
natural
product-inspired
compound
collections.
Journal of the American Chemical Society,
Journal Year:
2017,
Volume and Issue:
139(34), P. 11710 - 11713
Published: Aug. 9, 2017
Catalytic
α-olefination
of
nitriles
using
primary
alcohols,
via
dehydrogenative
coupling
alcohols
with
nitriles,
is
presented.
The
reaction
catalyzed
by
a
pincer
complex
an
earth-abundant
metal
(manganese),
in
the
absence
any
additives,
base,
or
hydrogen
acceptor,
liberating
dihydrogen
and
water
as
only
byproducts.
ACS Catalysis,
Journal Year:
2018,
Volume and Issue:
8(8), P. 7201 - 7207
Published: July 5, 2018
Manganese(I)
complexes
bearing
a
pyridyl-supported
pyrazolyl-imidazolyl
ligand
efficiently
catalyzed
the
direct
β-alkylation
of
secondary
alcohols
with
primary
under
phosphine-free
conditions.
The
β-alkylated
were
obtained
in
moderate
to
good
yields
water
formed
as
byproduct
through
borrowing
hydrogen
pathway.
β-Alkylation
cholesterols
was
also
effectively
achieved.
present
protocol
provides
concise
atom-economical
method
for
C–C
bond
formation
from
and
alcohols.
