Low-valent Niobium-mediated Synthesis of Indenes: Intramolecular Coupling Reaction of CF<sub>3</sub>Group with Alkene C–H Bond
作者:Kohei Fuchibe、Ken Mitomi、Takahiko Akiyama
DOI:10.1246/cl.2007.24
日期:2007.1
CF3 group of o-alkenyl-α,α,α-trifluorotoluenes underwent intramolecular coupling reaction with the alkene C–H bond under NbCl5/LiAlH4 system. Substituted indenes were obtained in good yields.
Gold for the Generation and Control of Fluxional Barbaralyl Cations
作者:Paul R. McGonigal、Claudia de León、Yahui Wang、Anna Homs、César R. Solorio-Alvarado、Antonio M. Echavarren
DOI:10.1002/anie.201207682
日期:2012.12.21
comparison with the shape‐shifting barbaralylcation, which exists as a mixture of 181 400 degenerate forms. Gold‐catalyzed cycloisomerizations of 7‐alkynyl cyclohepta‐1,3,5‐trienes were found to proceed via fluxionalbarbaralyl intermediates (see scheme). The evolution of the intermediates into 1‐ or 2‐substituted indenes could be controlled by the choice of gold complex.
METALLOCENE COMPOUND AND METHOD OF PREPARING THE SAME (As Amended)
申请人:LG CHEM, LTD.
公开号:US20160194422A1
公开(公告)日:2016-07-07
Provided are a metallocene compound having a novel structure capable of preparing a polyolefin having a broad molecular weight distribution and a high molecular weight, and a method of preparing the same. The metallocene compound according to the present invention includes a non-crosslinked catalyst structure, and implements copolymerizability in an ansa-type catalyst level, thereby preparing a polyolefin having a high molecular weight of 300,0000 or more.