Aryl bromides can efficiently react with some metallocenes, typically zirconocene dichloride, in the presence of a palladium/phosphine catalyst system and an appropriate base to produce the corresponding pentaarylated cyclopentadienes.
In Situ Structural Determination of a Homogeneous Ruthenium Racemization Catalyst and Its Activated Intermediates Using X‐Ray Absorption Spectroscopy
作者:Karl P. J. Gustafson、Arnar Guðmundsson、Éva G. Bajnóczi、Ning Yuan、Xiaodong Zou、Ingmar Persson、Jan‐E. Bäckvall
DOI:10.1002/chem.201905479
日期:2020.3.12
Ru‐catalyst, dicarbonyl(pentaphenylcyclopentadienyl)ruthenium chloride, has been studied in detail using time resolved in situ X‐ray absorption spectroscopy. The data provide bond lengths of the species involved in the process as well as information about bond formation and bond breaking. On addition of potassium tert‐butoxide, the catalyst is activated and an alkoxide complex is formed. The catalyst
Transition metal compound, coordinative compound, catalyst for polymerization of olefin, and process for polymerization of olefin using the catalyst
申请人:TOSOH CORPORATION
公开号:US20020120160A1
公开(公告)日:2002-08-29
A transition metal compound having a ligand with an azaferrocene structure or a ferrocene structure. The transition metal compound is used in combination with an activating cocatalyst, as a catalyst for polymerization of olefins.
Cyclopentadiene and metallocenes, typically zirconocene dichloride, are suitable substrates for multiple arylations with aryl bromides in palladium-catalyzed reactions. Thus, various aryl bromides bearing either an electron-donating or an electron-withdrawing substituent can react with these substrates to afford the corresponding 1,2,3,4,5-pentaaryl-13-cyclopentadienes in a single preparative step. Derivatives of cyclopentadiene. including di- and trisubstituted cyclopentadienes. and indene are arylated in a similar fashion.