A catalytic amount of 1,2-bis(diphenylphosphino)benzene (DPPBz) achieves selective cleavage of sp3-carbon–halogen bond in the iron-catalysed cross-coupling between polyfluorinated arylzinc reagents and alkyl halides, which was unachievable with a stoichiometric modifier such as TMEDA; the selective iron-catalysed fluoroaromatic coupling provides easy and practical access to polyfluorinated aromatic compounds.
Canopied trans-chelating bis(N-heterocyclic carbene) ligand: synthesis, structure and catalysis
作者:Brad P. Morgan、Gabriela A. Galdamez、Robert J. Gilliard, Jr.、Rhett C. Smith
DOI:10.1039/b815739a
日期:——
pseudo-square planar [PdCl(2)()] showed a similar binding mode of (C-Pd-C = 177 degrees ). High yields were obtained in Suzuki-Miyaura coupling reactions utilizing [PdCl(2)()] as the procatalyst and the results were compared with analogous complexes of trans-spanning diphosphine () and diphosphinite () complexes. The diphosphinite complex, [PdCl(2)()], decomposes to [mu-ClPd(PPh(2)OH)(PPh(2)O)](2) at room
Synthesis of Polyflourinated Biphenyls; Pushing the Boundaries of Suzuki–Miyaura Cross Coupling with Electron-Poor Substrates
作者:David Bulfield、Stefan M. Huber
DOI:10.1021/acs.joc.7b02267
日期:2017.12.15
different applications. Unfortunately, all current methods for the syntheses of these compounds only work for a hand full of molecules or only in very special cases. Thus, many of these compounds are still inaccessible to date. Here we report a general strategy for the synthesis of a wide range of highly fluorinated biphenyls. In our studies we investigated crucial parameters, such as different phosphine
Novel Liquid Crystalline Compounds Containing Bicyclo[3.1.0]hexane Core Units
作者:Sergei I. Kozhushkov、Rainer Langer、Dmitrii S. Yufit、Judith A. K. Howard、Heiko Schill、Dietrich Demus、Kazutoshi Miyazawa、Armin de Meijere
DOI:10.1002/ejoc.200300448
日期:2004.1
comparison of the liquidcrystalline properties of these newly prepared compounds containing a bicyclo[3.1.0]hexane core with those of the known analogous compounds with a cyclohexane fragment shows that as a rule, a bicyclo[3.1.0]hexane moiety decreases the transition temperature, while the dielectric (Δϵ) and optical (Δn) anisotropies are comparable. However, the bicyclo[3.1.0]hexane unit has a poorer
A new application of (polyfluoroorgano)trifluoroborate salts: the palladium-catalysed cross-coupling reaction with substituted benzenediazonium tetrafluoroborates
作者:Hermann-Josef Frohn、Nicolay Yu. Adonin、Vadim V. Bardin、Vladimir F. Starichenko
DOI:10.1016/s0022-1139(02)00157-4
日期:2002.10
influence of the number and the position of the fluorine atoms in the (polyfluorophenyl)trifluoroborate salts on the reactivity in the coupling reaction was elucidated. In addition to (polyfluorophenyl)trifluoroborate salts, the cross-coupling was expanded to a first example of a perfluoroalkenyl reagent. K[CF2CFBF3] reacted with [4-FC6H4N2][BF4] and formed CF2CF–C6H4F-4.
首次(多氟有机)三氟硼酸盐,即K [C 6 F 5 BF 3 ],K [C 6 HF 4 BF 3 ](所有三种异构体),K [3,4,5-C 6 H 2 F 3 BF 3 ]和K [CF 2 CFBF 3 ]的主要应用于作为试剂用于钯催化的交叉偶联反应。由K [C 6 H 5– n F n获得了一系列多氟联苯C 6 H 5– n F n –C 6 H 4 X-4'BF 3 ]和底物[4-XC 6 H 4 N 2 ] [BF 4 ]在Pd催化剂的存在下。阐明了(多氟苯基)三氟硼酸盐中氟原子的数目和位置对偶联反应中反应性的影响。除了(聚氟苯基)三氟硼酸盐以外,交叉偶联扩展为全氟烯基试剂的第一个实例。K [CF 2 CFBF 3 ]与[4-FC反应6 ħ 4 Ñ 2 ] [BF 4 ]和形成CF 2 CF-C 6 H ^ 4 F-4。