Palladium-catalyzed carbonylation of dicarbonates of but-2-yne-1,4-diol gives bis(methylene)butanedioates in high yields.
钯催化的二碳酸酯与丁-2-炔-1,4-二醇的羰基化反应可以高产率地生成双(亚甲基)丁二酸酯。
Synthesis of Itaconic Acid Ester Analogues via Self-Aldol Condensation of Ethyl Pyruvate Catalyzed by Hafnium BEA Zeolites
作者:Yuran Wang、Jennifer D. Lewis、Yuriy Román-Leshkov
DOI:10.1021/acscatal.6b00561
日期:2016.5.6
Lewis acidic zeolites are used to synthesize unsaturated dicarboxylic acidesters via aldol condensation of keto esters. Hafnium-containing BEA (Hf-BEA) zeolites catalyze the condensation of ethyl pyruvate into diethyl 2-methyl-4-oxopent-2-enedioate and diethyl 2-methylene-4-oxopentanedioate (an itaconic acidester analogue) with a selectivity of ca. 80% at ca. 60% conversion in a packed-bed reactor
路易斯酸性沸石用于通过酮酯的羟醛缩合来合成不饱和二羧酸酯。含的BEA(Hf-BEA)沸石催化丙酮酸乙酯缩合成2-甲基-4-氧代戊二烯-2-烯二酸二乙酯和2-亚甲基-4-氧代戊二烯酸二乙酯(衣康酸酯类似物) 。约80%在填充床反应器中60%的转化率。催化剂在运行中可稳定132小时,达到5110 mol EP mol Hf –1的周转数。分析Hf-BEA在流动条件下的动力学行为以及用Na交换沸石进行的研究表明,Hf(IV)的开放位点具有路易斯和布朗斯台德酸催化的双重功能。
MANUFACTURING METHOD OF SOLID CATALYST FOR PROPYLENE POLYMERIZATION
申请人:Samsung Total Petrochemicals Co. Ltd.
公开号:EP2511303A2
公开(公告)日:2012-10-17
Disclosed is a method for preparing a solid catalyst for propylene polymerization, specifically to a method for preparing a solid catalyst for propylene polymerization which can produce a polypropylene having high melt flow rate, a wide molecular distribution and excellent stereoregularity with a high production yield.
SOLID CATALYST FOR PROPYLENE POLYMERIZATION AND A METHOD FOR PREPARATION OF POLYPROPYLENE USING THE SAME
申请人:KIM Sang Yull
公开号:US20120277389A1
公开(公告)日:2012-11-01
Provided are a solid catalyst for propylene polymerization which includes titanium, magnesium, halogen and an internal electron donor mixture of two or more compounds wherein the internal electron donor mixture includes at least one selected from the bicycloalkanes or bicycloalkenes and at least one selected from diethers and succinates, and a method for preparing propylene using the same. As disclosed, it is possible to prepare polypropylene having an excellent stereoregularity with a high production yield.