新型轴向手性联苯二膦配体E n m -BridgePhos,在联苯主链的5,5′-位上带有醚链桥,已被开发并成功应用于Rh催化的α-acetamido-1的对映选择性不对称氢化反应,3-茚满二酮,以高产率(高达 97%)提供手性 α-乙酰氨基-β-羟基苯并环戊酮,并具有优异的对映选择性(高达 99% ee)。该反应可以在克级规模上进行,相应的产物可作为合成手性螺苄基异喹啉生物碱类似物的重要中间体。晶体结构分析和DFT计算均表明E nm -BridgePhos-Rh配合物的大二面角与优异的对映选择性密切相关。
Disclosed is a method for preparing a dinitrile compound. The method includes reacting an alcohol compound with a nitrile compound having a terminal carbon-carbon unsaturated bond under anhydrous conditions. A potassium alkoxide having 1 to 5 carbon atoms is used as a catalyst in the course of the reaction. According to the method, a high-purity dinitrile compound can be prepared in a simple manner within a short reaction time indicating high productivity.
Aminopropylation of alcohols in the presence of amide or ether solvents
申请人:AIR PRODUCTS AND CHEMICALS, INC.
公开号:EP1512675A1
公开(公告)日:2005-03-09
This invention relates to an improved hydrogenation process for the preparation of etheramines. In the process, cyanoethylated alcohols, i.e., the reaction product of an alcohol with (meth)acrylonitrile, are contacted with hydrogen in the presence of a sponge cobalt catalyst. The improvement in the process resides in effecting the hydrogenation process utilizing a cyanoethylated alcohol feedstock contaminated with byproduct acrylonitrile and utilizing a solvent that solubilizes byproduct (meth)acrylonitrile present in the feedstock. Specific classes of solvents employed are ethers and amides.
Catalytic hydrogenation of nitriles to produce capsaicinoid derivatives and amine compounds, and methods for purifying and obtaining the polymorphs thereof
申请人:Meckler Harold
公开号:US20060047171A1
公开(公告)日:2006-03-02
Processes for preparing an amine compound by catalytically hydrogenating a precursor nitrile compound. In a particular aspect, the present hydrogenation process occurs in a dipolar organic solvent in the presence of a palladium/carbon catalyst and a strong anhydrous protic acid. In a further aspect, the preferred embodiment relates to a process for deprotecting a compound to produce an amine compound. In yet a further aspect, the preferred embodiment relates to amine products produced by the present processes. These amine products may be used for a variety of purposes.
Olefin polymerization catalyst and process for preparing polyolefin
申请人:SHOWA DENKO KABUSHIKI KAISHA
公开号:EP0644206A1
公开(公告)日:1995-03-22
An olefin polymerization catalyst and a process for preparing a polyolefin using the catalyst. The catalyst comprises: (a) an addition product of an organoaluminum oxy-compound with an organic polar compound having at least one atom selected from the group consisting of a phosphorus atom, a nitrogen atom, a sulfur atom, and an oxygen atom per molecule and free of active hydrogen; and (b) a metallocene.