Cyclopentadienyliron-mediated introduction of functionalized alkyl or alkynyl groups to arenes in an addition—demetallation sequence
作者:Ronald G. Sutherland、Chunhao Zhang、Adam Piórko
DOI:10.1016/0022-328x(91)80248-i
日期:1991.1
cyanomethyl, and phenylethynyl anions add selectively ortho to arenes containing electron-witdrawing groups and complexed with cyclopentadienyliron. Under similar reaction conditions anions such as alkyl, dichloromethyl and trichloromethyl add in a non-selective way. Addition of the trichloromethyl anion is thermodynamically controlled at extended reaction times and, due to the size of the anion, the
An ionic liquid catalyzed Friedel–Crafts alkylation reaction of substituted benzenes with CCl4 was developed. The reaction proceeded efficiently under mild conditions, gave corresponding trichloromethylarenes with diversity functional groups in moderate to good yields. The influence of Lewis acidity of ionic liquids on the conversion of the alkylation reaction has been investigated. Notably, the probable
The present invention provides a process to remove phosphine residue from a hydrogenated polymer solution. The process requires the addition of an organo-halide reagent (for example, benzyl bromide) to the hydrogenated polymer solution, which results in the formation of a phosphine-containing precipitate. The precipitate is then separated from the solution by mechanical means (for example, filtration or centrifugation).
Verbessertes Verfahren zur destillativen Aufarbeitung von Gemischen, die seitenkettenchlorierte Alkylaromaten enthalten
申请人:BAYER AG
公开号:EP0372262A1
公开(公告)日:1990-06-13
Gemische, die seitenkettenchlorierte Alkylaromaten enthalten, werden aufgearbeitet, indem man sie vor der Destillation bei erhöhter Temperatur mit einem inerten Gas ausbläst und die Destillation in Gegenwart von Aminen und/oder chlorierten Aminen durchführt.