Shanghai Research Institute of Chemical Industry Co., Ltd

China Petroleum Chemical Corporation

Yongqing Li

Xiaofeng Ye

Yucai Cao

Chen Ni

Fan Wang

Jie Li

Zhaolin Yin

Shibing Chen

Zhenyu Liu

Si Tan

Ruizhen Lu

An Shen

Lujian Li

Dongwen Zhong

Guoyu Liu

Weizhe Wang

Xionghua Chen

Xiangyang Wu

Zhenxu Lu

Shengbiao Liang

Wenjun Jiang

A method for preparing a high viscosity index poly-α-olefin subjects α-olefin to a polymerization reaction in the presence of a metallocene catalyst to obtain a poly-α-olefin. The polymerization reaction is carried out in the absence of a solvent, and the metallocene catalyst is formed of, or is formed by interaction between, a metallocene compound and an activator.

Method for preparing high viscosity index poly-alpha-olefin

The present invention relates to an n-heterocyclic carbene (NHC) type palladium catalyst and its preparation method as well as applications. Its preparation process is as below: select glyoxal as the raw material to synthesize glyoxaldiimine in the presence of Lewis acid or Bronsted acid, and then react with paraformaldehyde to get the NHC type ligand. Use palladiumto react with the compound containing carbon-nitrogen double bonds to get palladiumcyclic dimer; make the palladium cyclic dimer and the NHC type ligand coordinated to get the NHC type palladium catalyst. The palladium catalyst with a brand new structure according to the present invention, boasts high activity and multi-purpose. In addition, it shows excellent reaction activity in a lot of catalytic-coupling reactions including Suzuki-Miyaura, Heck, Buchwald-Hartwig, Kumada-Tamao-Corriu, Sonogashira, Negishi and &#x3b1;-ketone arylation reactions, and some reactions even can be carried out with the presence of an extremely low concentration of catalyst, exhibiting favorable industrialization prospect.

N-heterocyclic carbene type palladium catalyst and its preparation method as well as applications

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Shanghai, China

Yongqing Li