Organic Letters,
Journal Year:
2024,
Volume and Issue:
26(41), P. 8832 - 8836
Published: Oct. 9, 2024
A
nickel-catalyzed
tandem
alkoxylation/claisen
rearrangement
strategy
for
the
oxy-difluoroallylation
of
ynamides
has
been
developed.
In
this
reaction,
3,3-difluoroallyl
alcohol
was
used
as
a
fluorine-containing
building
block
to
construct
C–CF2
bond
first
time.
This
approach
is
recognized
its
robust
tolerance
functional
groups,
impressive
yields,
and
excellent
atomic
efficiency,
all
achieved
under
mild
reaction
conditions.
series
β,β-difluoromethyleneamide
derivatives
were
efficiently
obtained
through
simple
operations,
their
practicality
confirmed
gram-scale
synthesis
product
derivatization.
Organic Chemistry Frontiers,
Journal Year:
2024,
Volume and Issue:
11(6), P. 1720 - 1728
Published: Jan. 1, 2024
Two
new
cascade
approaches
for
N
-CF
3
indoles
via
transition-metal-catalyzed
reactions
from
2-alkynylaryl
isothiocyanates
or
2-alkynylanilines
have
been
demonstrated,
featuring
mild
conditions,
a
broad
substrate
scope
and
moderate
to
high
yields.
Journal of Applied Polymer Science,
Journal Year:
2024,
Volume and Issue:
141(35)
Published: June 15, 2024
Abstract
A
range
of
new
fluorine‐containing
copolyarylates
were
successfully
produced
through
interfacial
polymerization
using
hexafluorobisphenol
(BPAF)
featuring
a
symmetric
trifluoromethyl
group
structure,
bisphenol
B
(BPB),
and
two
acyl
chloride
monomers
as
raw
materials.
The
results
indicated
that
the
synthesized
amorphous
exhibited
good
solubility,
with
number
average
molecular
weights
(
M
n
)
19,000–44,000
g/mol,
weight
w
66,000–159,000
intrinsic
viscosities
0.66–1.19
dL/g.
thermal
stability
increased
increase
BPAF
monomer
content
(0~100%),
which
was
manifested
by
linear
glass
transition
temperature
T
g
from
201.6
to
237.1°C,
5%
thermogravimetric
loss
474.1
491.5°C.
tensile
strength
ranged
52.63
59.93
MPa,
modulus
1102.08
1502.84
elongation
at
break
32.0
75.5%.
In
addition,
had
dielectric
properties
constant
2.58–3.75
10
7
Hz
tangent
0.021–0.028.
Molecules,
Journal Year:
2024,
Volume and Issue:
29(13), P. 3104 - 3104
Published: June 29, 2024
Studies
have
shown
that
the
incorporation
of
fluorine
into
materials
can
improve
their
properties,
but
C–F
bonds
are
not
readily
formed
in
nature.
Although
some
researchers
studied
reaction
fluorinating
alkenes
catalyzed
by
hypervalent
iodine,
far
too
little
attention
has
been
paid
to
its
mechanism.
This
study
aimed
explore
mechanism
iodine-catalyzed
1,4-difluorination
dienes.
We
found
catalyst
is
favorable
for
activation
C1=C2
double
through
halogen
bonds,
and
then
two
HFs
interact
with
one
F
atom
via
hydrogen
resulting
cleavage
I–F
formation
[F–H∙∙∙F]−.
Subsequently,
interacts
C1,
roaming
[F–H···F]−
attacks
C4
from
opposite
side
catalyst.
After
fluorination
step
completed,
nucleophile
F−
substitutes
SN2
Our
calculations
demonstrated
interaction
between
HF
stabilization
transition
state
within
process
which
presence
best.
also
observed
[F–H∙∙∙F]−
attacking
more
advantageous
than
same
side.
therefore
offers
a
novel
perspective
on
fluoridation
Organic Chemistry Frontiers,
Journal Year:
2024,
Volume and Issue:
11(23), P. 6748 - 6759
Published: Jan. 1, 2024
This
article
discloses
the
unprecedented
hypervalent
iodide(
iii
)-mediated
thiofluorination
of
alkenes/alkynes
involving
cyclic
sulfonium
ion
intermediate
or
traditional
π-complexes.
Organic Letters,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 4, 2024
In
this
study,
we
synthesized
trifluoromethyl-substituted
bis-triazole
nitrogen-rich
compounds
(3–5)
using
a
simple,
cost-effective
method.
The
newly
made
were
characterized
NMR,
IR,
elemental
analysis,
TGA-DSC,
and
single-crystal
X-ray
diffraction
(for
3
4).
They
demonstrated
high
density
(1.82–1.92
g
cm–3),
moderate
detonation
performance
(7567–7905
m
s–1),
good
thermal
stability
(146–215
°C),
low
sensitivity
to
impact
(40
J)
friction
(360
N),
offering
potential
nature
as
cationic
component
in
energetic
salts,
defense,
civilian
applications.
Energies,
Journal Year:
2024,
Volume and Issue:
17(23), P. 6126 - 6126
Published: Dec. 5, 2024
We
performed
a
theoretical
investigation
of
the
fluorinated
compounds’
morphology
and
stability.
The
research
was
conducted
using
widely
adopted
DFT
approach,
specifically
B3LYP
method
cc-pVTZ
basis
set,
aiming
to
design
high-energy
materials
that
exhibit
low
sensitivity,
toxicity,
instability,
reduced
proneness
decomposition
or
degradation
over
short
period.
In
paper,
we
presented
results
for
compounds
whose
total
energy
is
lowest.
Their
thermal
chemical
stability
evaluated
based
on
indicators
such
as
cohesion,
hardness,
softness.
oxygen–fluorine
balance
assessed
determine
sensitivity
these
advanced
materials.
density,
detonation
pressure,
velocity
selected
conformers
were
theoretically
obtained
reveal
influence
-CF3,
-OCF3,
cyclic
-O(CF2)nO-
fragments
energetic
properties
nitroaromatics
well
their
resistance
shock
stimuli.
enable
prediction
achieve
favorable
between
power
Based
achieved,
put
forward
CF3N2,
OCF3N2,
C2F6N2,
1CF2N2/O2CF2N2,
2CF4N2/O2C2F4N2
practical
usage
because
possess
greater
compared
tetryl
better
explosive
than
TNT.
