Synthesis of 2-bromo-1-aryl-1H-indenes via a Ag(I) promoted domino 2π-electrocyclic ring-opening/4π-electrocyclization reaction of 1,2-diaryl substituted gem-dibromocyclopropanes
摘要:
2-Bromo-1-aryl substituted indenes can be synthesized from 1,2-diaryl substituted gem-dibromocyclopropanes via a domino reaction sequence. The cascade reaction involves silver(I) promoted ionization and 2 pi-disrotatory electrocyclic ring-opening, followed by a 4 pi-conrotatory electrocyclic ring closing reaction of the allylic carbocation intermediate. Reaction conditions utilize silver tetrafluoroborate (AgBF4) in dichloroethane at 65 degrees C. Selectivity effects for the electrocyclization were also studied. The 2-bromoindenes can be further functionalized using cross-coupling reactions, such as the Suzuki-Miyaura protocol. The alkene it-bond of the indenes can also be isomerized to give the thermodynamically more stable 2-bromo-3-aryl-1H-indene isomers using triethylamine in dichloromethane at room temperature. (C) 2013 Published by Elsevier Ltd.
<i>C</i><sub>1</sub>-Symmetric Si-bridged (2-indenyl)(1-indenyl) <i>ansa</i>-metallocenes as efficient ethene/1-hexene copolymerization catalysts
作者:Dmitry V. Uborsky、Dmitry Y. Mladentsev、Bogdan A. Guzeev、Ilya S. Borisov、Antonio Vittoria、Christian Ehm、Roberta Cipullo、Coen Hendriksen、Nic Friederichs、Vincenzo Busico、Alexander Z. Voskoboynikov
DOI:10.1039/c9dt04896k
日期:——
Synthesis, ethene/1-hexene copolymerization screening, and QSAR study of 28 silicon bridged (2-indenyl)(1-indenyl) zirconocenes: new promising catalysts for LLDPE were identified.
[EN] PROCESS TO MAKE HIGHLY SUBSTITUTED INDENES USING METAL SLAT CATALYSTS<br/>[FR] PROCÉDÉ DE PRODUCTION D'INDÈNES FORTEMENT SUBSTITUÉS À L'AIDE DE CATALYSEURS DE TYPE SEL MÉTALLIQUE
申请人:ROSOCHA GREGORY
公开号:WO2014064477A1
公开(公告)日:2014-05-01
The present invention is a process to make l-aryl-2-bromo substituted indenes and l-phenyl-2-bromo substituted indenes that can have different functional groups present around the indene ring and/or the aromatic and/or phenyl ring. The indenes are made using the corresponding 1,2- biaryl-gem-dibromocyclopropane and/or 1,2-biphenyl-gem-dibromocyclopropanes and/or 1-aryl- 2-phenyl-gem-dibromocyclopropanes using a metal salts, a solvent, low temperatures.
[EN] THE CROSS COUPLING OF 2-BROMO-1-PHENYL INDENES WITH PHENYL ACETYLENES AND OTHER SUBSTITUTED ACETYLENES IN WATER<br/>[FR] COUPLAGE CROISÉ DE 2-BROMO-1-PHÉNYL-INDÈNES AVEC DES PHÉNYL-ACÉTYLÈNES ET AUTRES ACÉTYLÈNES SUBSTITUÉS DANS L'EAU
申请人:ROSOCHA YAROSLAV GREGORY
公开号:WO2014064478A1
公开(公告)日:2014-05-01
The cross-coupling reaction of 2-bromo-1 -phenyl indenes with phenyl acetylenes or propargyl alcohol is disclosed. The cross-coupling reaction uses a palladium catalyst with triphenylphosphine in the absence of a copper co-catalyst. The reaction is carried out with pyrrolidine as the base in water at 120 °C.
Dimethyl-silyl-bridged-1-substituted-2-indenyl metallocene complexes for olefin polymerization
申请人:SABIC GLOBAL TECHNOLOGIES B.V.
公开号:US11155659B2
公开(公告)日:2021-10-26
The invention relates to a metallocene complex according to formula A, wherein R1-R10 are independently selected from H, C1-C10 alkyl, C7-C20 Aralkyl groups, and C1-C10 alkoxy groups; wherein R11 is selected from methyl, ethyl, propyl, isopropyl, butyl, phenyl; wherein R1 and R2, R3 and R4, R4 and R5, R5 and R6, R7 and R8, R8 and R9, and/or R9 and R10 can be connected to form a ringstructure; wherein R0 is selected from a C1-C10 alkyl group or an aryl group wherein M is selected from Ti, Zr and Hf, X is an anionic ligand to M, z is the number of X groups and equals the valence of M minus 2. The invention further relates to a catalyst for preparing polyolefins, a process for polymerizing olefins and to polymers prepared by said catalyst system.
本发明涉及根据式 A 的茂金属络合物,其中 R1-R10 独立地选自 H、C1-C10 烷基、C7-C20 芳烷基和 C1-C10 烷氧基;其中 R11 选自甲基、乙基、丙基、异丙基、丁基和苯基;其中 R1 和 R2、R3 和 R4、R4 和 R5、R5 和 R6、R7 和 R8、R8 和 R9 和/或 R9 和 R10 可连接形成环状结构;其中 R0 选自 C1-C10 烷基或芳基 其中 M 选自 Ti、Zr 和 Hf,X 是 M 的阴离子配位体,z 是 X 基团的数目,等于 M 的价数减 2。本发明还涉及一种制备聚烯烃的催化剂、一种聚合烯烃的工艺以及由上述催化剂体系制备的聚合物。
Synthesis of [μ-methyllenebis(η5-3-tert-butyl-2-methylinden-1-yl)dichlorozirconium(IV)]
作者:N. B. Ivchenko、P. V. Ivchenko、I. E. Nifant'ev、V. V. Kotov
DOI:10.1007/bf02494722
日期:2000.5
An efficient synthetic approach to 3-alkyl(aryl)-2-bromoindenes was developed. The reaction of 2-bromo-3-tert-butylindene with MeMgl catalyzed by Ni(dppp)Cl-2 afforded 3-tert-buryl-2-methylindene from which bis(3-tert-butyl-2-methytinden-1-yl)methane and the corresponding ansa-zirconacene were synthesized.