已经实现了使用DMC的新型异质酸(纳米晶体ZSM-5)催化醇的羧甲基化为不对称的碳酸烷基酯。通过水热结晶合成了晶体大小为20–30 nm的纳米晶体ZSM-5(NZSM-5)。合成的NZSM-5通过X射线衍射,傅立叶变换红外光谱和固态NMR进行验证。透射电子显微镜和扫描电子显微镜证实了NZSM-5的形态,揭示了由纳米大小(20-30 nm)的NZSM-5颗粒堆积形成的沸石(100-200 nm)聚集体的形成。NZSM-5的理化性质通过氮的吸附和程序升温的氨解吸来测量,这表明表面积为465 m 2 g -1酸度为0.936 mmol g -1。本协议为高产量的各种非对称碳酸烷基酯提供了一种有吸引力的方法。催化剂被有效地循环多达5个连续循环。这种方法拓宽了DMC在绿色化学中可能的利用范围。
Non-symmetrical dialkyl carbonate synthesis promoted by 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride
作者:Subodh Kumar、Suman L. Jain
DOI:10.1039/c3nj00640a
日期:——
An efficient synthesis of non-symmetrical dialkyl carbonates promoted by 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride ionic liquid as a reaction medium is described. The ionic liquid can easily be recovered and reused several times without significant change in the activity and selectivity.
N-Bicycloheptyl- und N-Bicycloheptenyl-imidazole, Verfahren zu ihrer Herstellung, ihre Verwendung sowie pharmazeutische Präparate
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0158144A1
公开(公告)日:1985-10-16
N-Bicycloheptyl- und N-Bicycloheptenylimidazole der Formel
worin A, B, R1, R2 und n die angegebenen Bedeutungen haben, sowie deren physiologisch verträgliche Salze, Verfahren zur Herstellung dieser Verbindungen, pharmazeutische Präparate auf Basis dieser Verbindungen sowie ihre Verwendung als Arzneimittel insbesondere zur Behandlung von Störungen des Serumlipoproteinspektrums, sind Gegenstand der Erfindung.
式中的 N-双环庚基和 N-双环庚烯基咪唑,其中 A、B、R1、R2 和 n 具有给定的含义。
式中 A、B、R1、R2 和 n 的含义,及其生理上可耐受的盐、这些化合物的制备工艺、基于这些化合物的药物制剂和它们作为药物的用途,特别是用于治疗血清脂蛋白谱的紊乱,是本发明的主题。
Preparation of highly pure alpha-methylstyrene polymer
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0240212A2
公开(公告)日:1987-10-07
An improved process for the anionic polymerization of alpha-methylstyrene polymers employs an organolithium initiator and, as an initiator activator compound, a sodium-, potassium-, rubidium- or cesiumderivative of an oxygen-, sulfur- or nitrogen-containing organic compound. The process permits the preparation of polymers such as copolymers of styrene and alpha-methylstyrene having high purity and reduced color.
Lubricating oil composition for refrigeration machine
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0655494A1
公开(公告)日:1995-05-31
Disclosed is a lubricating oil composition for refrigeration machine comprising 100 parts by weight of a carboxylic ester having a number-average molecular weight (Mn) of 200 to 5,000 and a kinematic viscosity at 100 °C of 2 to 100 cSt or a carbonic ester having a number-average molecular weight (Mn) of 200 to 5,000 and a kinematic viscosity at 100 °C of 2 to 100 cSt, and 0.001 to 15 parts by weight of a fluoroalkyl group-containing alcohol. The lubricating oil composition for refrigeration machine can extremely reduce the amount of metal abrasion at the slide part of the compression type refrigeration machine in which hydrogenated fluorocarbon (HFC) such as R-134a is used as a refrigerant. This composition can be also used for refrigeration machines of other types than the compression type because of its excellent lubricating properties.