ACS Catalysis,
Journal Year:
2020,
Volume and Issue:
10(24), P. 14824 - 14833
Published: Dec. 3, 2020
This
study
describes
the
use
of
a
silicon(II)
complex,
namely,
NHC-silyliumylidene
cation
complex
[(IMe)2SiH]I
(1,
IMe
=
:C{N(Me)C(Me)}2),
to
catalyze
chemoselective
N-formylation
primary
and
secondary
amines
using
CO2
PhSiH3
under
mild
conditions
afford
corresponding
formamides
as
sole
product
(average
reaction
time:
4.5
h;
amines,
average
yield:
95%,
TOF:
8
h–1;
98%,
17
h–1).
The
activity
1
yields
outperform
currently
available
non-transition-metal
catalysts
used
for
this
catalysis.
Mechanistic
studies
show
that
center
in
catalyzes
C–N
bond
formation
via
different
pathway
comparison
with
catalysts.
It
sequentially
activates
CO2,
PhSiH3,
which
proceeds
dihydrogen
elimination
mechanism,
form
formamides,
siloxanes,
gas.
Green Chemistry,
Journal Year:
2020,
Volume and Issue:
22(13), P. 4231 - 4239
Published: Jan. 1, 2020
Calcium
carbide
was
used
as
a
sustainable
dehydrating
agent
for
the
synthesis
of
carbamates,
glycerol
carbonate,
and
cyclic
carbonates
directly
from
CO2.
ACS Catalysis,
Journal Year:
2020,
Volume and Issue:
10(24), P. 14824 - 14833
Published: Dec. 3, 2020
This
study
describes
the
use
of
a
silicon(II)
complex,
namely,
NHC-silyliumylidene
cation
complex
[(IMe)2SiH]I
(1,
IMe
=
:C{N(Me)C(Me)}2),
to
catalyze
chemoselective
N-formylation
primary
and
secondary
amines
using
CO2
PhSiH3
under
mild
conditions
afford
corresponding
formamides
as
sole
product
(average
reaction
time:
4.5
h;
amines,
average
yield:
95%,
TOF:
8
h–1;
98%,
17
h–1).
The
activity
1
yields
outperform
currently
available
non-transition-metal
catalysts
used
for
this
catalysis.
Mechanistic
studies
show
that
center
in
catalyzes
C–N
bond
formation
via
different
pathway
comparison
with
catalysts.
It
sequentially
activates
CO2,
PhSiH3,
which
proceeds
dihydrogen
elimination
mechanism,
form
formamides,
siloxanes,
gas.