Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 25, 2024
Cu-catalyzed
carbonyl
hydrosilylation
involves
a
ligated
"[(L)CuH]"
as
the
active
catalyst,
where
ligand
L
has
crucial
role
toward
stability,
stereoselectivity,
and
enhancement
of
hydridicity.
Strongly
σ-donating
N-heterocyclic
carbenes
(NHCs),
their
ring-expanded
form,
an
abnormal
NHC
ligands
have
yielded
robust
efficient
Cu
catalysts.
However,
cyclic(alkyl)(amino)carbenes
(CAACs),
despite
being
stronger
σ-donors
than
NHCs
already
having
salient
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(5), P. 2617 - 2650
Published: Feb. 22, 2024
The
societal
importance
of
plastics
contrasts
with
the
carelessness
which
they
are
disposed.
Their
superlative
properties
lead
to
economic
and
environmental
efficiency,
but
linearity
puts
climate,
human
health,
global
ecosystems
at
risk.
Recycling
is
fundamental
transitioning
this
linear
model
into
a
more
sustainable,
circular
economy.
Among
recycling
technologies,
chemical
depolymerization
offers
route
virgin
quality
recycled
plastics,
especially
when
valorizing
complex
waste
streams
poorly
served
by
mechanical
methods.
However,
exists
in
interlinked
system
end-of-life
fates,
complementarity
each
approach
key
environmental,
economic,
sustainability.
This
review
explores
recent
progress
made
five
commercial
polymers:
poly(ethylene
terephthalate),
polycarbonates,
polyamides,
aliphatic
polyesters,
polyurethanes.
Attention
paid
not
only
catalytic
technologies
used
enhance
efficiencies
also
interrelationship
other
systemic
constraints
imposed
Novel
polymers,
designed
for
depolymerization,
concisely
reviewed
terms
their
underlying
chemistry
potential
integration
current
plastic
systems.
Advanced Sustainable Systems,
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 15, 2024
Abstract
The
use
of
alkaline
earth‐abundant
metal
catalysts
as
alternatives
to
transition
in
the
depolymerization
plastic
waste
is
a
very
important
research
area.
In
this
work,
first
method
described
for
conversion
polyesters
into
value‐added
compounds
catalyzed
by
magnesium
catalyst.
It
demonstrated
that
commercially
available,
inexpensive
and
air‐stable,
earth
catalyst
Mg(OTf)
2
efficiently
promotes
reductive
several
using
pinacolborane
(HBpin)
reducing
agent
with
good
excellent
yields.
This
also
remains
active
at
least
12
consecutive
polycaprolactone
(PCL)
reactions
yields
between
89%
81%.
efficient
polycarbonate
poly(bisphenol
A
carbonate)
(PC.BPA).
Furthermore,
it
found
successfully
catalyzes
methanolysis
polycarbonates
moderate
temperature
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
This
review
comprehensively
explores
various
homogeneous
and
heterogeneous
catalytic
systems
for
the
hydrogenolysis
of
oxygenated
polymeric
wastes
(OXPs),
presenting
an
adaptable
solution
to
plastic
pollution
generating
valuable
feedstock.
Tetrahedron,
Journal Year:
2023,
Volume and Issue:
133, P. 133267 - 133267
Published: Jan. 18, 2023
Based
on
our
recent
findings
in
the
area
of
zirconocene
hydride
catalysis,
we
have
identified
a
mild
and
chemoselective
strategy
for
formal
semi-hydrogenation
terminal
alkynes
utilizing
catalytic
quantities
Schwartz's
reagent
or
Cp2ZrCl2.
This
protocol
accommodates
variety
functional
groups,
delivering
monosubstituted
alkenes
bearing
ester,
nitrile,
epoxy,
amino,
halo,
sulfide
hydroxyl
groups.
Advanced Sustainable Systems,
Journal Year:
2023,
Volume and Issue:
8(3)
Published: Sept. 7, 2023
Abstract
This
work
describes
the
depolymerization
of
several
polyester
and
polycarbonate
plastic
waste
in
value‐added
compounds
catalyzed
by
air
stable,
cheap
commercially
available
manganese
Mn(OTf)
2
,
Mn
(CO)
10
MnBr(CO)
5
MeCpMn(CO)
3
using
boranes
silanes
as
reducing
agents
with
good
to
excellent
yields.
Commercial
heterogeneous
catalyst,
manganeses(II)
ethyl/butyl
phosphonate
silica
(Si‐Mn),
has
also
proven
be
very
efficient
reductive
a
variety
polyesters
PC.BPA.
The
use
Si‐Mn
consecutive
is
investigated,
showing
that
these
catalysts
remain
their
activity
after
reactions.
Organometallics,
Journal Year:
2023,
Volume and Issue:
42(11), P. 1166 - 1178
Published: March 2, 2023
Four
cationic
amidotitanocene
complexes
[Cp2Ti(NRR′)][B(C6F5)4]
(Cp
=
η5-C5H5;
1a:
R
R′
p-anisyl;
1b:
p-fluorophenyl,
1c:
phenyl;
1d:
phenyl,
2-pyridyl)
were
synthesized.
Complexes
1a–d
undergo
Ti–N
bond
homolysis
under
visible
light
irradiation.
1a–c
catalyze
the
polymerization
of
phenylsilane
to
yield
branched
polysilane
polymers
with
molecular
weights
(Mw)
up
approximately
3000
and
dispersity
indexes
(Đ)
1.4–1.6.
Previously
reported
Group
4
amidometallocene
[Cp2Ti(NPh2)][B(C6F5)4]
(Ia)
Cp2Zr(NPh2)][MeB(C6F5)3]
(IIa)
also
tested
in
hydrosilylation
carbonyl
compounds
triethylsilane
(Et3SiH).
In
some
cases,
complex
Ia
afforded
completely
reduced
products
(e.g.,
ethylbenzene
from
acetophenone),
while
IIa
was
generally
more
selective
(1-phenylethoxy)triethylsilane
acetophenone)
but
active.
Complex
could
convert
anisole
derivatives
phenoxysilanes
high
efficiency
(TON
2000).
Advanced Sustainable Systems,
Journal Year:
2023,
Volume and Issue:
7(11)
Published: Sept. 4, 2023
Abstract
This
work
describes
a
novel
method
for
the
efficient
reductive
depolymerization
of
polyester
and
polycarbonate
plastic
waste
using
pinacolborane
(HBpin)
catalyzed
by
Zn(OAc)
2
.2H
O
Zn(OTf)
.
is
applied
to
variety
has
advantages
combining
use
non‐toxic,
cheap,
commercially
available
catalysts
with
mild,
easy‐to‐handle
reducing
agent,
excellent
yields,
under
mild
reaction
conditions.
