Synthesis of Indenes by the Transition Metal-Mediated Carboannulation of Alkynes
作者:Daohua Zhang、Zhijian Liu、Eul K. Yum、Richard C. Larock
DOI:10.1021/jo0620563
日期:2007.1.1
The synthesis of highly substituted indenes has been achieved by three different transition metal-mediated methods. The first method involves the palladium-catalyzed carboannulation of internalalkynes. The second method utilizes a two-step approach, which involves first the palladium/copper-catalyzed cross-coupling of terminalalkynes with appropriately functionalized aryl halides, followed by copper-catalyzed
OLEFIN POLYMERIZATION CATALYST CARRIER, SOLID CATALYST COMPONENT AND USE THEREOF
申请人:Renqiu Lihe Technology Ltd.
公开号:US20170355792A1
公开(公告)日:2017-12-14
Provided is an olefin polymerization catalyst carrier with a general structure formula of Mg(OR
I
)
n
(OR
II
)
2-n
, wherein: 0≦n≦2, and R
I
and R
II
can be the same or different and are each independently selected from a C
1
-C
20
hydrocarbon group. In the X-ray diffraction pattern of the catalyst carrier, there are a set of diffraction peaks in the range of a 2θ diffraction angle of 5°-15°, and the set of diffraction peaks contain 1-4 main diffraction peaks. Also disclosed is an olefin polymerization solid catalyst component which is prepared from the carrier Mg(OR
I
)
n
(OR
II
)
2-n
, a titanium compound, and at least one electron donor compound. In addition, also disclosed is an olefin polymerization catalyst containing the solid catalyst component, at least one organic aluminum compound, and optionally, an external electron donor compound.