通过片段缩合已经制备了几种在对位具有三个或四个不同取代基的手性杯[4]芳烃。标准的衍生化程序总是导致形成各种构象异构体的混合物,仅通过制备型HPLC可以从中分离出圆锥构象的衍生物。对于四酯衍生物,通过二维1 H NMR光谱显示,由于取代基的不同,其圆锥构象强烈扭曲。然而,该四酯的钠络合物再次呈现规则的锥构型。
通过片段缩合已经制备了几种在对位具有三个或四个不同取代基的手性杯[4]芳烃。标准的衍生化程序总是导致形成各种构象异构体的混合物,仅通过制备型HPLC可以从中分离出圆锥构象的衍生物。对于四酯衍生物,通过二维1 H NMR光谱显示,由于取代基的不同,其圆锥构象强烈扭曲。然而,该四酯的钠络合物再次呈现规则的锥构型。
METHOD FOR PRODUCING OLEFIN BLOCK POLYMER USING GROUP 4 TRANSITION METAL COMPLEX
申请人:Sumitomo Chemical Company, Limited.
公开号:US20140163173A1
公开(公告)日:2014-06-12
A method for producing an olefin block polymer, the method including: polymerizing olefins using a polymerization catalyst (X) and an organometallic compound (C) containing an atom of any of Groups 2, 12, and 13 of the periodic table of the elements, the organometallic compound (C) excluding an activating co-catalyst agent (B), wherein the polymerization catalyst (X) is formed by bringing a transition metal compound (A) into contact with the activating co-catalyst agent (B), the transition metal compound (A) is represented by the following general formula (1), and the activating co-catalyst agent (B) is selected from among an organoaluminumoxy compound (B-1), an organoboron compound (B-2), a zinc co-catalyst component (B-3), and ion-exchange layered silicate (B-4).
[EN] OLEFIN POLYMERIZATION CATALYST AND METHOD FOR PRODUCING OLEFIN POLYMER<br/>[FR] CATALYSEUR DE POLYMÉRISATION OLÉFINIQUE ET PROCÉDÉ POUR LA PRÉPARATION DE POLYMÈRE OLÉFINIQUE
condensation. Standard derivatization procedures always led to the formation of mixtures of various conformational isomers from which the derivative in the cone-conformation could be isolated only by preparative HPLC. For a tetraester derivative it was shown by two-dimensional 1H NMR spectroscopy, that due to the different substituents the cone-conformation is strongly distorted. The sodium complex of this tetraester
通过片段缩合已经制备了几种在对位具有三个或四个不同取代基的手性杯[4]芳烃。标准的衍生化程序总是导致形成各种构象异构体的混合物,仅通过制备型HPLC可以从中分离出圆锥构象的衍生物。对于四酯衍生物,通过二维1 H NMR光谱显示,由于取代基的不同,其圆锥构象强烈扭曲。然而,该四酯的钠络合物再次呈现规则的锥构型。