Dual Nickel- and Photoredox-Catalyzed Reductive Cross-Coupling of Aryl Halides with Dichloromethane via a Radical Process
作者:Wenhao Xu、Purui Zheng、Tao XU
DOI:10.1021/acs.orglett.0c03248
日期:2020.11.6
The first catalytic strategy to harness a new chloromethane radical from dichloromethane under dual Ni/photoredox catalytic conditions has been developed. Compared with traditional two-electron reductiveprocess associated with metallic reductants, this method via a single-electron approach can proceed under exceptionally mild conditions (visible light, ambient temperature, no strong base) and exhibits
A novel catalytic cross deoxygenative and dehydrogenative coupling reaction of aldehydes and alkenes was established via a cooperative catalysis approach. This transformation provided an efficient and atom-economic protocol for the synthesis of 1,4-skipped dienes fromaldehydes and simple alkenesunder oxidant-free reaction conditions.
Bridged zirconocene compounds, process for their preparation and their use as catalyst components in the polymeriaztion of olefins
申请人:Montell Technology Company B.V.
公开号:US20010014751A1
公开(公告)日:2001-08-16
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization of olefins. Particularly it is possible to prepare, with high yields, ethylene (co)polymers having low molecular weights and narrow molecular weight distributions, without the need of using considerable amounts of molecular weight regulators, such as hydrogen.
Bridged zirconocene compounds, process for their preparation and their use as catalyst components in the polymerization of olefins
申请人:Montell Technology Company B.V.
公开号:US20020039962A1
公开(公告)日:2002-04-04
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization of olefins. Particularly it is possible to prepare, with high yields, ethylene (co)polymers having low molecular weights and narrow molecular weight distributions, without the need of using considerable amounts of molecular weight regulators, such as hydrogen.
Methylene bridged metallocenes as olefin-polymerization catalyst components
申请人:Basell Poliolefine Italia S.p.A.
公开号:US20040147695A1
公开(公告)日:2004-07-29
A new class of methylene-bridged metallocenes of formula (I), wherein M is a transition metal of group 3, 4, 5, 6, lanthanide or actinide; X is a monoanionic sigma ligand; R
1
can be alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl radicals; R
2
can be halogen, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl radical; p is 0-3; m is 0-2; and n is 0-4. Furthermore, the corresponding ligands, a new process for their preparation and catalysts systems containing said methylene-bridged metallocenes are described.
1