[EN] NOVEL METHOD FOR PREPARING STYRENIC OLEFINS<br/>[FR] NOUVELLE METHODE DE PREPARATION D'OLEFINES STYRENIQUES
申请人:LG CHEMICAL LTD
公开号:WO2005035468A1
公开(公告)日:2005-04-21
The present invention relates to a method for preparing a styrenic olefin. The method of the present invention comprises the steps of: adding a catalyst and a solvent in a reactor and heating the reactor to create a reflux state; adding an alcohol starting material to the reactor dropwise at a constant rate; removing water generated by adding the alcohol starting material from the reactor; and purifying the obtained styrenic olefin. The method of the present invention is advantageous in minimizing byproducts and preparing styrenic olefins having a variety of substituents in high yield.
The First Asymmetric Halogen/Metal-Exchange Reaction: Desymmetrization of Alcohols with Enantiotopic Bromoarene Substituents
作者:Daniel Sälinger、Reinhard Brückner
DOI:10.1002/chem.200802488
日期:2009.7.6
Choosy organomagnesium: Prochiral bis(bromoaryl)alcohols were desymmetrized by treatment with iPr2Mg and an enantiopure Li salt. The resulting arylmagnesium intermediate was trapped with electrophiles. Protonolysis and two follow‐up reactions provided the antihistaminic and anticholinergic drug (R)‐orphenadrine (see scheme).
Copper-catalyzed remote oxidation of alcohols initiated by radical difluoroalkylation of alkenes: facile access to difluoroalkylated carbonyl compounds
作者:Jian Zhang、Weiwei Jin、Cungui Cheng、Fang Luo
DOI:10.1039/c8ob00889b
日期:——
A Cu-catalyzed oxidation of alcohols triggered by the radical difluoroalkylation of alkenes has been developed, providing facile access to a series of difluoroalkylated ketones or aldehydes in moderate to high yields. The concurrent realization of the catalytic oxidation of alcohols and difluoroalkylation of alkenes enables a highly efficient and attractive method for organic synthesis.
作者:Douglass F. Taber、Beverly S. Dunn、James F. Mack、Samir A. Saleh
DOI:10.1021/jo00211a043
日期:1985.5
Cyclization of <i>o</i>-Allylstyrene via Hydrosilylation: Mechanistic Aspects of Hydrosilylation of Styrenes Catalyzed by Palladium−Phosphine Complexes
作者:Yasuhiro Uozumi、Hayato Tsuji、Tamio Hayashi
DOI:10.1021/jo980100b
日期:1998.9.1
Hydrosilylation of o-allylstyrene with trichlorosilane in the presence of 0.3 mol % of a palladium catalyst bearing triphenylphosphine gave trans-1-methyl-2-(trichlorosilylmethyl)indan, 1-(2-(2-propenyl)phenyl)-1-trichlorosilylethane, and 1-(2-((E)-1-propenyl)phenyl)-1-trichlorosilylethane. The reaction of styrene with trichlorosilane gave a quantitative yield of 1-phenyl-1-(trichlorosilyl)ethane while allylbenzene did not give silylation products under the same reaction conditions. These results show that the hydropalladation process is operative in the hydrosilylation of styrene derivatives with trichlorosilane catalyzed by palladium-phosphine complexes.