摘要:
A method for producing 1,2-bis (indenyl) ethanes in good yield is described. An agent and its application for isomerizing kinetic EBI to thermodynamic EBI and for isomerizing meso TMS-EBI to rac TMS-EBI are exemplified.
摘要:
A magnesium compound represented by the formula (I) which is obtained by reacting metal magnesium, ethanol, methanol and a halogen and/or a halogen-containing compound containing at least 0.0001 gram atom of a halogen atom relative to one gram atom of the metal magnesium
Mg(OEt) 2-n (OMe) n (I)
where Et is an ethyl group, Me is a methyl group and n is a numerical value of from 0.001 to 1.
摘要:
A magnesium compound obtained by reacting metallic magnesium having a sphericity (S) of less than 4.00, the sphericity (S) being represented by the following formula (I), an alcohol, and a halogen and/or a halogen-containing compound containing halogen atoms in an amount of 0.0001 gram atom or more relative to one gram atom of the metallic magnesium, S = (L 1 /L 2 ) 3 wherein L 1 represents the maximum diameter of projection views of metallic magnesium determined by photographing with a scanning electron microscope and thereafter an image processing, and L 2 represents a diameter of a circle having an area equal to the area of the projection view of metallic magnesium. A solid catalyst component is obtained from the magnesium compound and a titanium compound, and a catalyst for olefin polymerization is obtained using the solid catalyst component.
摘要翻译:通过使具有小于4.00的球形度(S)金属镁得到的镁化合物中,球形度(S)由下式(I)至醇和卤素和/或含卤素的含卤素化合物为代表 原子在0.0001克原子或相对更重要的金属镁,<= DF NUM “(I)”> S =(L1 / L2),一个原子的量<3> DF> worin L1 darstellt最大直径 的金属镁的投影视图确定性通过用扫描型电子显微镜和此后的图像处理的拍摄开采,并且L2 darstellt直径上具有面积等于金属镁的投影视图的面积的圆的。 的固体催化剂组分是由镁化合物和钛化合物获得的,并且用于烯烃聚合的催化剂,使用固体催化剂成分得到。
摘要:
Die Erfindung betrifft Granulate von Alkali- und Erdalkali-Alkoholaten von aliphatischen, unverzweigten oder verzweigten, gesättigten oder ungesättigten Alkoholen, mit insbesondere 1 bis 6 Kohlenstoffatomen im alkoholischen Rest. Die Granulate bieten erhebliche handhabungstechnische Vorteile gegenüber den bisher üblichen Lösungen oder Pulvern.
摘要:
A method for the preparation of 1,3-diketones is disclosed wherein the method comprises the steps of: (A) mixing an alkali metal base with a hindered alcohol in an aromatic hydrocarbon solvent; (B) boiling the mixture and azeotropically distilling water formed by the reaction between the base and the alcohol, whereby a solution of a hindered alkali metal alkoxide is formed in situ in the solvent; (C) mixing an ester with the solution of the hindered alkali metal alkoxide in the aromatic hydrocarbon solvent; and then (D) adding a ketone to the mixture.
摘要:
Die vorliegende Erfindung betrifft partikelförmiges Magnesiumethoxid mit Grobkornanteil, das durch Siebkornfraktionen ≤ 500 µm mit einem Anteil von 500 µm mit einem Anteil von ≥ 60 Gew.-% gekennzeichnet ist. Erfindungsgemäßes Magnesiumethoxid ist durch Umsetzen von metallischem, gegebenenfalls aktiviertem Magnesium mit flüssigem Ethanol unter Druck bei einer Temperatur oberhalb 78 °C und anschließender Produktgewinnung erhältlich. Die vorliegende Erfindung betrifft ferner das Verfahren zur Herstellung von erfindungsgemäßem Magnesiumethoxid und seine Verwendung als Precursor für Ziegler-Natta-Katalysatoren, als Precursor für Keramik sowie als Precursor für Buchkonservierungsmittel.
摘要:
A process for quickly preparing easily separable solutions of lithium tertiary-alkoxides. Comprising the steps of reacting lithium metal in bulk form, containing less than 0.6 % by weight of sodium, with a tertiary alcohol in mole ratios of metal to alcohol ranging from 1 to 1 to 10 to 1 in a solvent selected from ethereal or hydrocarbon solvents under an inert atmosphere at elevated temperature for 1 to 10 hours, cooling the product and separating the product solution from the unreacted lithium metal in the reactor, and optionally adding solvent and sufficient lithium metal and alcohol to said unreacted metal in said reactor to maintain said mole ratio of lithium metal to alcohol, and continuing the reaction, thereby to form further lithium tert-alkoxide, and repeating said steps a number of times.