Lifetimes of .alpha.-dialkoxy carbocations produced via radical cations generated by electron transfer and photoionization in aqueous solution
作者:S. Steenken、R. A. McClelland
DOI:10.1021/ja00195a061
日期:1989.6
Obtention des carbocations diethoxy-1,1 alkylium par reaction du diethylacetal de phenyl-1 alcanones-2 avec le radical SO 4 −•
获得碳正离子二乙氧基-1,1 烷基对反应二乙缩醛脱苯基-1 烷酮-2 avec le 自由基 SO 4 −•
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.
Regio- and Stereoselective Intermolecular Hydroalkoxylation of Alkynes Catalysed by Cationic Gold(I) Complexes
作者:Avelino Corma、Violeta R. Ruiz、Antonio Leyva-Pérez、María J. Sabater
DOI:10.1002/adsc.201000094
日期:——
levels of stereoselectivity by using cationic gold(I)‐phosphine complexes as catalysts. By choosing the appropriate phosphine, the selective formation of the Z or the E isomer of the vinyl ether can be tuned, and the undesired formation of the ketal can be controlled. The isomerisation of fumarates (Z‐isomer) to maleates (E‐isomer) is a gold‐catalysed process that can be conducted in one‐pot. When