Copper(I) Diphosphine Bifluoride Complexes as Efficient Preactivated Catalysts for Nucleophilic Addition on Unsaturated Functional Groups
作者:Corentin Rasson、Olivier Riant
DOI:10.1021/acs.oprd.9b00443
日期:2020.5.15
Herein we report the synthesis of a family of copper(I) diphosphine bifluoride complexes, their characterization, and their use as efficient preactivated catalysts for nucleophilic copper addition of pronucleophiles on unsaturations. Their use as mechanistic probes is also highlighted by the identification of two copper deuterides.
Synthesis and electrochemistry of late transition metal complexes containing 1,1′-bis(dicyclohexylphosphino)ferrocene (dcpf). The X-ray structure of [PdCl2(dcpf)] and Buchwald–Hartwig catalysis using [PdCl2(bisphosphinometallocene)] precursors
作者:Laura E. Hagopian、Alison N. Campbell、James A. Golen、Arnold L. Rheingold、Chip Nataro
DOI:10.1016/j.jorganchem.2006.08.030
日期:2006.11
electrochemistry of 1,1′-bis(dicyclohexylylphosphino)ferrocene (dcpf) was examined in methylene chloride with tetrabutylammonium hexafluorophosphate or tetrabutylammonium tetrakis(pentafluorophenyl)borate as the supporting electrolyte. The oxidation of dcpf is complicated by a follow-up reaction. Seven new complexes containing dcpf and one new compound containing 1,1′-bis(di-tert-butylphosphino)ferrocene (dtbpf)
Stoichiometric Studies on the Carbonylative Trifluoromethylation of Aryl Pd(II) Complexes using TMSCF<sub>3</sub> as the Trifluoromethyl Source
作者:Katrine Domino、Martin B. Johansen、Kim Daasbjerg、Troels Skrydstrup
DOI:10.1021/acs.organomet.9b00849
日期:2020.3.9
carbonylative coupling of an aryl bromide with TMSCF3. Our work revealed that benzoyl Pd(II) complexes bearing Xantphos or tBu3P as the phosphine ligands, which are generated from the corresponding PdII(Ph)Br complexes exposed to stoichiometric 13CO from 13COgen, were unable to undergo transmetalation and reductive elimination to trifluoroacetophenone. Instead, in the presence of base and additional CO, these
我们已经进行了一系列的化学计量研究,以确定可行的步骤为一个假设的催化循环的芳族溴化物与TMSCF 3的钯介导的羰基化偶联。我们的工作表明,带有Xantphos或t Bu 3 P作为膦配体的苯甲酰基Pd(II)配合物是由相应的Pd II(Ph)Br配合物从13暴露于化学计量的13 CO中生成的二氧化碳不能进行金属转移和还原消除为三氟苯乙酮。相反,在碱和另外的CO的存在下,这些有机金属配合物容易进行还原性消除为酰氟。试图确定酸性氟化物是否可以代表苯乙酮生产的中间体的尝试是没有意义的。尽管转化效率仍然很低,但只有在硼酸酯存在下,我们才能观察到所需产物的某些形成。最后,我们研究了四种膦连接的Pd II(Ph)CF 3配合物(Xantphos,D t BPF,t Bu 3 P和三苯膦)与一氧化碳的反应性。除了t Bu 3 P连接的配合物,所有其他金属配合物导致三氟乙酰苯的容易形成。我们在三苯基膦的情
A cyclic octithiophene containing β,β′-linkages
作者:Kengo Asai、Aiko Fukazawa、Shigehiro Yamaguchi
DOI:10.1039/c5cc00570a
日期:——
A cyclic octithiophene containing β,β′-linkages showed red-shifted fluorescence compared to α-quaterthiophene and a spin delocalization in the radical cation state.
Simple, Highly Active Palladium Catalysts for Ketone and Malonate Arylation: Dissecting the Importance of Chelation and Steric Hindrance
作者:Motoi Kawatsura、John F. Hartwig
DOI:10.1021/ja983378u
日期:1999.2.1
catalytic reaction rates. We initially tested the bisphosphine ligand DtBPF (1,1‘-bis-(di-tert-butylphosphino)ferrocene) for this palladium-catalyzed chemistry. This catalyst system led to fast reaction rates for reactions of aryl bromides with ketones, including roomtemperature chemistry in many cases. In some cases turnover numbers were 20 000. The catalyst also gave mild reactions with aryl chlorides