A palladium-catalyzed carbon–carbon bond activation-initiated reaction of 2-(3-phenyloxiran-2-yl)benzonitriles with arylboronic acids is reported. Multiple chemical bonds were cleavaged and reconstructed via β-carbon elimination in this reaction, enabling the construction of valuable benzo-fused dipyrromethenes that are difficult to prepare by other methods. Additionally, a series of benzannulated
Palladium catalyzed Suzuki–Miyaura coupling with aryl chlorides using a bulky phenanthryl N-heterocyclic carbene ligand
作者:Chun Song、Yudao Ma、Qiang Chai、Chanqin Ma、Wei Jiang、Merritt B. Andrus
DOI:10.1016/j.tet.2005.05.071
日期:2005.8
carbene (NHC) based palladium acetate catalyst was effective for the coupling of various aryl and vinyl chlorides with organoboron compounds. N,N-Bis-(2,9-dicyclohexyl-10-phenanthryl)-4,5-dihydroimidazolium chloride 8 (H2ICP·HCl) with Pd(OAc)2 and KF·18-c-6 in THF at room temperature gave Suzuki–Miyaura coupling of aryl and vinyl chorides, including unactivated and di-ortho substituted substrates in high
as Raschig rings or placed within the PASSflow TM microreactor affords technical devices that are well suited for performing palladium-catalyzed carbon-carbon cross-couplingreactions in the flow-through mode. Reusability of the immobilized precatalyst as well as applications in the microwave field were investigated. Experiments with thiol- and pyridine-based scavengers were carried out, which revealed
[EN] NEW POLYMERIZABLE LIQUID CRYSTAL HAVING A CARBAZOLE CORE<br/>[FR] NOUVEAU CRISTAL LIQUIDE POLYMÉRISABLE AYANT UN COEUR CARBAZOLE
申请人:ROLIC TECH AG
公开号:WO2020260617A1
公开(公告)日:2020-12-30
The invention relates to novel anisotropic compounds of formula (I) as well as to liquid crystalline mixtures, films and electro-optical devices comprising the compound.
该发明涉及公式(I)的新型各向异性化合物,以及包含该化合物的液晶混合物、薄膜和电光器件。
Palladium Catalyst Systems for Cross-Coupling Reactions of Aryl Chlorides and Olefins
solvents on the Heck coupling reaction of 4-trifluoromethyl-1-chlorobenzene (2) is presented. It is shown that a number of catalystsystems exist for efficient cross coupling of electron-deficient arylchlorides with various olefins. Basicity and steric demand of the ligand are two factors which determine the success of the reaction. In addition the phosphine/palladium ratio, the correct type and amount