[EN] PROCESS FOR PRODUCING METALLOCENES<br/>[FR] PROCÉDÉ DE PRODUCTION DE MÉTALLOCÈNES
申请人:LANXESS ORGANOMETALLICS GMBH
公开号:WO2020156998A1
公开(公告)日:2020-08-06
The present invention relates to an improved process for the preparation of metallocenes of the general formula (A) CR2L2MX2 as well as to intermediates useful in the synthesis of said metallocene and the use thereof as a catalyst in a polymerization of an olefin.
Pd(II)-Catalyzed Direct <i>ortho</i>-C–H Acylation of Aromatic Ketones by Oxidative Decarboxylation of α-Oxocarboxylic Acids
作者:Pui-Yiu Lee、Peiwen Liang、Wing-Yiu Yu
DOI:10.1021/acs.orglett.7b00677
日期:2017.4.21
A Pd-catalyzed decarboxylative acylation of aromaticketones with α-oxocarboxylic acids was developed, and 1,2-diacylbenzenes were formed in up to 90% yield with excellent ortho-selectivity. This work demonstrates the first successful attempt to direct C–H acylation of aromaticketones without the need for prederivatization to imines. The acylation reaction was inhibited by radical scavengers such
Chemistry at Boron: Synthesis and Properties of Red to Near-IR Fluorescent Dyes Based on Boron-Substituted Diisoindolomethene Frameworks
作者:Gilles Ulrich、Sébastien Goeb、Antoinette De Nicola、Pascal Retailleau、Raymond Ziessel
DOI:10.1021/jo200246q
日期:2011.6.3
emitters in the 650–800 nm region. When perylene or pyrene residues are connected to the dyes, almost quantitative energytransfer from them to the dye core occurs, providing large virtual Stokes shifts spanning from 8000 to 13 000 cm–1 depending on the nature of the dye. All the dyes are redox active, providing the Bodipy radical cation and anion in a reversible manner. Stepwise reduction or oxidation to
Molecular oxygen, the most environmentally friendly oxidant, was used as the terminal oxidant for palladium-catalyzed radical oxidative acylation of arenes.
分子氧气,作为最环保的氧化剂,被用作钯催化的芳烃自由基氧化酰化反应的末端氧化剂。
Palladium-Catalyzed Regioselective Acylation of Diazines with Toluenes: A New Approach to the Synthesis of <i>ortho</i>
-Diacylbenzenes
A practical, versatile, and efficient method for the palladium catalyzed regioselective acylation of ketazines with toluene has been developed which provides a new approach for ortho‐acylation of aryl ketones.