Differentiating CBr and CCl Bond Activation by Using Solvent Polarity: Applications to Orthogonal Alkyl-Alkyl Negishi Reactions
作者:Niloufar Hadei、George T. Achonduh、Cory Valente、Christopher J. O'Brien、Michael G. Organ
DOI:10.1002/anie.201100705
日期:2011.4.18
A pot to share: A CalkylClbond can be rendered “dormant” or “active” in the Negishialkyl–alkyl cross‐coupling by a simple solventpolarity “switch” (see scheme). Adjustment from a 1:2 to a 2:1 solvent ratio of dimethylimidazolidinone:tetrahydrofuran enables orthogonalalkyl–alkylNegishi cross‐coupling strategies to be carried out on bifunctional bromochloroalkanes in one pot at room temperature
SOLID CATALYST FOR OLEFIN POLYMERIZATION AND PROCESS FOR PRODUCING OLEFIN POLYMER
申请人:Sumitomo Chemical Company, Limited
公开号:US20130072648A1
公开(公告)日:2013-03-21
A solid catalyst for olefin polymerization and a process for producing an olefin polymer are provided. The polymer has a small content of a component which is dissolved out into a low temperature organic solvent, such as a low-molecular weight component and an amorphous component. The solid catalyst is obtained by bringing a solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and an aliphatic carboxylate; an organoaluminum compound; and a compound represented by formula (I) into contact with each other:
wherein R
1
is a hydrocarbyl group having 1 to 10 carbon atoms, R
2
is a hydrogen atom, a halogen atom or a hydrocarbyl group having 1 to 16 carbon atoms, and the R
1
the R
2
groups are independently the same or different, and the respective R
1
groups and R
2
groups may be joined with each other to form a ring.