两个新的二酐2,2'-双(4''-叔丁基苯基)-4,4',5,5'-联苯四甲酸二酐(BBBPAn)和2,2'-双(4''-三甲基甲硅烷基苯基) -4,4' ,5,5'-联苯四甲酸二酐(BTSBPAn),含有非共面扭曲联苯单元构成的叔制备了丁基丁基或三甲基甲硅烷基苯基。由二酐和芳族二胺通过常规的聚酰胺酸反应,然后进行化学亚胺化和高温一步聚合,制得了两个系列的新型有机可溶性聚酰亚胺。聚合物的结构通过各种光谱技术确认。所得聚合物的重均分子量和多分散性分别在60 400-332 400和1.87-3.51的范围内。聚酰亚胺在各种有机溶剂(如氯仿和THF)中显示出良好的溶解性。通过热重分析测量,聚酰亚胺在氮气中在540-550°C时显示出5%的重量损失。聚酰亚胺显示出高的T g和良好的机械性能。薄膜的透氧系数(P O 2)和氧对氮的渗透选择性(P O 2 / P N 2)分别在31-110 barrer和2
Palladium-catalyzed double cross-coupling reaction of 1,2-bis(pinacolatoboryl)alkenes and -arenes with 2,2′-dibromobiaryls: annulative approach to functionalized polycyclic aromatic hydrocarbons
This study demonstrates that the doublecross-coupling reaction of 1,2-bis(pinacolatoboryl)alkenes and -arenes with 2,2′-dibromobiaryls proceeds smoothly with the aid of a catalytic amount of Pd(PPh3)4 in the presence of excess base to give a variety of polycyclic aromatic hydrocarbons, such as phenanthrenes, [5]helicene, dithienobenzenes, triphenylenes, dibenzo[g,p]chrysenes, and triphenyleno[1,2-b:4
这项研究表明,在催化量的Pd(PPh 3)4存在下,1,2-双(频哪醇硼基)烯烃和-芳烃与2,2'-二溴联芳基的双交叉偶联反应可以顺利进行。过量的碱可得到各种多环芳烃,例如菲,[5]螺旋烯,二硫代苯,三苯撑,二苯并[ g,p ],和三苯并[1,2- b:4,3- b ']二噻吩好到高产。值得注意的是,使用2,2'-二溴八氟联苯作为亲电试剂的环化反应提供了否则难以合成的八氟菲和半氟化二苯并[ g,p] chrysenes高产。
Domino C–F Bond Activation of the CF<sub>3</sub> Group: Synthesis of Fluorinated Dibenzo[<i>a</i>,<i>c</i>][7]annulenes from 2-(Trifluoromethyl)-1-alkenes and 2,2′-Diceriobiaryls
via the domino SN2′-type/SNV reaction between 2-(trifluoromethyl)-1-alkenes and 1,4-carbodianions. The SN2′-type reaction of 2-(trifluoromethyl)-1-alkenes with 2,2′-diceriobiaryls generated the intermediary 1,1-difluoro-1-alkenes bearing a monoceriobiaryl moiety, which in turn underwent intramolecular SNV reaction to afford fluorinated 5H-dibenzo[a,c][7]annulenes.
环氟化7元碳环的构建是通过将多米诺小号容易地实现Ñ 2'-型/ S Ñ V 2-(三氟甲基)之间的反应-1-烯烃和1,4- carbodianions。在S Ñ 2'-型的2-(三氟甲基)-1反应烯烃与所生成的中间1,1-二氟1-烯烃带有monoceriobiaryl部分,2,2'- diceriobiaryls这反过来后行分子内小号Ñ V反应得到氟化的5 H-二苯并[ a,c ] [7]环。
[EN] CATALYST COMPRISING A METALLOCENE COMPLEX AND A CO-CATALYST<br/>[FR] CATALYSEUR COMPRENANT UN COMPLEXE MÉTALLOCÈNE ET UN CO-CATALYSEUR
申请人:SABIC GLOBAL TECHNOLOGIES BV
公开号:WO2017118617A1
公开(公告)日:2017-07-13
The invention relates to a metallocene complex according to formula I or II wherein M is a metal selected from lanthanides or transition metals from group 3, 4, 5 or 6 of the Periodic System of the Elements, Q is an anionic ligand to M, k is the number of Q groups and equals the valence of M minus 2, R is a divalent bridging group, R1, R2, R3 and R4 are each independently chosen from the group consisting of hydrogen (H); a halogen atom; a silyl, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl group; and R5, R6, R7 and R8 are each independently chosen from the group consisting of hydrogen (H); a halogen atom; a silyl, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl group; or two adjacent radicals R5 and R6, R6 and R7, and R7 and R8 are connected with each other in a hydrocarbon ring system. The invention also relates to a catalyst comprising the metallocene complex, to a process for making polyolefins and to the use of the polyolefins for making articles.
Synthesis of triphenylene derivatives by Pd-catalyzed Suzuki coupling/intramolecular C H activation between arylboronic acids and dibromobiphenyls
作者:Jingxuan Tu、Gaoqiang Li、Xiaoqian Zhao、Feng Xu
DOI:10.1016/j.tetlet.2018.11.052
日期:2019.1
An efficient and regioselective synthesis of functionalized triphenylenes via palladium-catalyzed Suzuki-Miyaura coupling and subsequent intramolecular CH activation between arylboronic acids and dibromobiphenyls was developed. This methodology showed excellent atomic economy and regiospecificity as well as synthetic feasibility of unsymmetrical triphenylenes.