Light‐Driven
<i>gem</i>
Hydrogenation: An Orthogonal Entry into “Second‐Generation” Ruthenium Carbene Catalysts for Olefin Metathesis
作者:Raphael J. Zachmann、Alois Fürstner
DOI:10.1002/chem.202101176
日期:2021.5.17
The newly discovered light‐driven gem hydrogenation of alkynes opens an unconventional yet efficient entry into five‐coordinate Grubbs‐type ruthenium carbene complexes with cis‐disposed chloride ligands. Representatives of this class featuring a chelate substructure formed by an iodo‐substituted benzylidene unit react with (substituted) 2‐isopropoxystyrene to give prototypical “second‐generation” Grubbs‐Hoveyda
Reductive Cyclization of Diynes and Enynes Catalyzed by Allyl Platinum N-Heterocyclic Carbene Complexes
作者:Il Gu Jung、Junhyeok Seo、Sang Ick Lee、Soo Young Choi、Young Keun Chung
DOI:10.1021/om0606284
日期:2006.8.1
Platinum N-heterocyclic carbene (NHC) complexes have been synthesized and used as precatalysts in the reductive cyclization of diynes and eynes. 2,5-Dihydrofurans, -pyrroles, and -cyclopentenes were obtained as reductive cyclization products from oxygen-, nitrogen-, and carbon-tethered substrates, respectively. The yield and product of the reaction were highly dependent upon the substrate and the substituent on the alkyne.
POLYMERIZATION METHODS USING THE CATALYSTS
申请人:LG Chem. Ltd.
公开号:EP1937731B1
公开(公告)日:2015-11-04
Polymerization methods using the catalysts
申请人:Chung Keun Young
公开号:US20070123666A1
公开(公告)日:2007-05-31
Provided is a method of preparing a cyclic olefin polymer by addition polymerization of a cyclic olefin monomer, the method including contacting a metal catalyst complex represented by Formula 1 below with a cyclic olefin monomer represented by Formula 2 below:
[M(L
1
)
x
(L′
2
)
y
(L
3
)
z
]
a
[Ani]
b
wherein M is a Group X metal; [M(L
1
)
x
(L′
2
)
y
(L
3
)
z
] is a cationic complex; L
1
is an anionic hydrocarbyl-containing ligand; L′
2
is a neutral ligand; L
3
is an N-heterocyclic carbene ligand; [Ani] is an anion capable of weakly coordinating with the metal M; x is 1 or 2; y is 0 to 4; z is 1 or 2; 2≦x+y+z≦6; a and b are respectively the number of cations and the number of anions capable of weakly coordinating with the metal M and are each a number of 1-10 which is used to satisfy the net charge balance of the metal catalyst complex, and wherein for each of L
1
, L′
2
, and L
3
, when a plurality of ligands are present in a molecule of the metal catalyst complex, the ligands may be the same or different, and
wherein m is an integer of 0 to 4; and R
7
, R′
7
, R″
7
, and R″′
7
are each independently a polar functional group or a nonpolar functional group. According to the method of the present invention, a high molecular weight cyclic olefin addition polymer can be produced in a high yield even when using a polar functional group-containing cyclic olefin monomer. A polymer produced using the method shows good thermal stability.