10 research outputs found
New latent metathesis catalysts equipped with exchangeable boronic ester groups on the NHC
<p>Latent metathesis catalysts equipped with boronate esters of diols as exchangeable end-groups on their NHC ligands and an S-chelated ruthenium-benzylidene core were synthesized. The stable S-chelated ruthenium complexes underwent hydrolysis under mild acidic conditions, allowing easy exchange of terminal units by several 1,2- and 1,3-diols, without degrading the central ruthenium benzylidene. Using this strategy, we also prepared metathesis catalysts equipped with diallyl substrates at the termini that showed concentration dependency on RCM reactions. Notably, the larger dendritic catalysts were more efficient at the more dilute condition.</p
Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a Cyclic (Alkyl)(amino)carbene Ligand
Sulfur-chelated
ruthenium olefin metathesis precatalysts that possess
cyclic (alkyl)(amino)carbenes (CAAC) can benefit from the synergetic
effect of both ligands. Changing the steric bulk of the CAAC ligand
by using different substitution patterns was shown to affect the geometry
of the complexes produced and determined whether the complexes could
be catalytically dormant. The <i>cis</i>-dichloro latent
catalysts could be activated both by heat or light, even in the visible
region, for representative acyclic diene metathesis and ring-opening
metathesis polymerization reactions, olefin cross-metathesis, and
ring-closing metathesis without isomerization byproducts. Thus, these
complexes were shown to combine the uniqueness of CAAC-containing
Ru olefin metathesis catalysts with the advantage of the thermal and
photolatency imposed by sulfur chelation of the benzylidene
Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a Cyclic (Alkyl)(amino)carbene Ligand
Sulfur-chelated
ruthenium olefin metathesis precatalysts that possess
cyclic (alkyl)(amino)carbenes (CAAC) can benefit from the synergetic
effect of both ligands. Changing the steric bulk of the CAAC ligand
by using different substitution patterns was shown to affect the geometry
of the complexes produced and determined whether the complexes could
be catalytically dormant. The <i>cis</i>-dichloro latent
catalysts could be activated both by heat or light, even in the visible
region, for representative acyclic diene metathesis and ring-opening
metathesis polymerization reactions, olefin cross-metathesis, and
ring-closing metathesis without isomerization byproducts. Thus, these
complexes were shown to combine the uniqueness of CAAC-containing
Ru olefin metathesis catalysts with the advantage of the thermal and
photolatency imposed by sulfur chelation of the benzylidene
Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a Cyclic (Alkyl)(amino)carbene Ligand
Sulfur-chelated
ruthenium olefin metathesis precatalysts that possess
cyclic (alkyl)(amino)carbenes (CAAC) can benefit from the synergetic
effect of both ligands. Changing the steric bulk of the CAAC ligand
by using different substitution patterns was shown to affect the geometry
of the complexes produced and determined whether the complexes could
be catalytically dormant. The <i>cis</i>-dichloro latent
catalysts could be activated both by heat or light, even in the visible
region, for representative acyclic diene metathesis and ring-opening
metathesis polymerization reactions, olefin cross-metathesis, and
ring-closing metathesis without isomerization byproducts. Thus, these
complexes were shown to combine the uniqueness of CAAC-containing
Ru olefin metathesis catalysts with the advantage of the thermal and
photolatency imposed by sulfur chelation of the benzylidene
Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a Cyclic (Alkyl)(amino)carbene Ligand
Sulfur-chelated
ruthenium olefin metathesis precatalysts that possess
cyclic (alkyl)(amino)carbenes (CAAC) can benefit from the synergetic
effect of both ligands. Changing the steric bulk of the CAAC ligand
by using different substitution patterns was shown to affect the geometry
of the complexes produced and determined whether the complexes could
be catalytically dormant. The <i>cis</i>-dichloro latent
catalysts could be activated both by heat or light, even in the visible
region, for representative acyclic diene metathesis and ring-opening
metathesis polymerization reactions, olefin cross-metathesis, and
ring-closing metathesis without isomerization byproducts. Thus, these
complexes were shown to combine the uniqueness of CAAC-containing
Ru olefin metathesis catalysts with the advantage of the thermal and
photolatency imposed by sulfur chelation of the benzylidene
Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a Cyclic (Alkyl)(amino)carbene Ligand
Sulfur-chelated
ruthenium olefin metathesis precatalysts that possess
cyclic (alkyl)(amino)carbenes (CAAC) can benefit from the synergetic
effect of both ligands. Changing the steric bulk of the CAAC ligand
by using different substitution patterns was shown to affect the geometry
of the complexes produced and determined whether the complexes could
be catalytically dormant. The <i>cis</i>-dichloro latent
catalysts could be activated both by heat or light, even in the visible
region, for representative acyclic diene metathesis and ring-opening
metathesis polymerization reactions, olefin cross-metathesis, and
ring-closing metathesis without isomerization byproducts. Thus, these
complexes were shown to combine the uniqueness of CAAC-containing
Ru olefin metathesis catalysts with the advantage of the thermal and
photolatency imposed by sulfur chelation of the benzylidene