- Synthesis and Characterization of a N,C,N-Carbodiphosphorane Pincer Ligand and Its Complexes
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The reaction of 2-pyridiyldiphenylphosphine (2) with tetrachloromethane and subsequent dehalogenation of the intermediate chloro phosphonium salt [(CDPPy2)Cl]Cl (3) with tris(1-pyrrolidyl)phosphine results in the formation of a new type of carbodiphosphorane N,C,N pincer ligand, sym-bis(2-pyridyl)tetraphenylcarbodiphosphorane, CDPPy2 (1). It crystallizes in a triclinic crystal system with a crystallographic point group of P1. This neutral double-ylidic N,C,N ligand is capable of stabilizing a wide range of metal coordination polyhedra, varying from square planar [(CDPPy2)PdCl]Cl (4), octahedral mer-[(CDPPy2)TiCl3] (5) and fac-[(CDPPy2)Cr(CO)3] (6) to trigonal-bipyramidal [(CDPPy2)MnCl2] (9) and [(CDPPy2)CoCl2] (10) complexes. Unprecedented dinuclear complexes are formed with molybdenum and nickel carbonyls. 1 reacts with [Mo(CO)3(NCMe)3] to form the symmetric κ3-N,C,N-[(CDPPy2)Mo(CO)3(μ-CO)Mo(CO)3] (7) with one bridging carbonyl next to a bridging central carbon atom with its two lone pairs. In contrast, an unsymmetrical coordination mode with only one coordinated pyridine is observed in κ2-N,C-[(CDPPy2)Ni(CO)(μ-CO)Ni(CO)2] (8). Carbodiphosphorane-based ligands are unique due to their σ,πfour-electron-donor character of the central carbon atom toward one metal and alternatively their 2σ four-electron-donor character toward two vicinal metal atoms.
- Klein, Marius,Xie, Xiulan,Burghaus, Olaf,Sundermeyer, J?rg
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Read Online
- The Trityl-Cation Mediated Phosphine Oxides Reduction
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Reduction of phosphine oxides into the corresponding phosphines using PhSiH3 as a reducing agent and Ph3C+[B(C6F5)4]? as an initiator is described. The process is highly efficient, reducing a broad range of secondary and tertiary alkyl and arylphosphines, bearing various functional groups in generally good yields. The reaction is believed to proceed through the generation of a silyl cation, which reaction with the phosphine oxide provides a phosphonium salt, further reduced by the silane to afford the desired phosphine along with siloxanes. (Figure presented.).
- Landais, Yannick,Laye, Claire,Lusseau, Jonathan,Robert, Frédéric
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supporting information
p. 3035 - 3043
(2021/05/10)
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- Synthesis method of phosphine (III) compound
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The invention aims to provide an aryl phosphine oxide compound as a raw material, wherein P=O keys are activated by an acid anhydride and alkali is continued. The preparation of the phosphine (III) compound is carried out under the action of a crown ether and a reducing agent. The method has the advantages of cheap and easily available raw materials, simple operation, high atomic economy and the like. Compared with a traditional reduction mode, the method is ingenious in design, waste emission is reduced, separation of intermediate products is omitted, and related reagents such as silicon hydrogen, aluminum, boron and the like with higher price can be avoided. And the reaction suitability is extensive.
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Paragraph 0020
(2021/11/27)
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- Efficient potassium hydroxide promoted P-arylation of aryl halides with diphenylphosphine
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A simple synthetic method of triarylphosphine compounds by KOH-promoted P-Arylation reaction of aryl halides with diphenylphosphine is presented. Notably, this transformation could smoothly proceed with high yields under transition-metal-free and mild reaction conditions. In addition, this protocol is valuable for industrial application due to the convenient operation and readily accessible aromatic halides. A possible explanation of the reaction mechanism was proposed based on the experimental data.
- Chen, Jin,Dai, Bencai,Liu, Changchun,Shen, Zhihao,Zhou, Yang
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- Phosphination of Phenol Derivatives and Applications to Divergent Synthesis of Phosphine Ligands
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We describe a general and efficient protocol for the synthesis of organophosphine compounds from phenols and phosphines (R2PH) via a metal-free C-O bond cleavage and C-P bond formation process. This approach exhibits broad substrate scope and excellent functional group tolerance. The synthetic utilities of this protocol were demonstrated by the synthesis of chiral ligands via the various transformations of cyano groups and their applications in asymmetric catalysis.
- Li, Chenchen,Zhang, Kezhuo,Zhang, Minghao,Zhang, Wu,Zhao, Wanxiang
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supporting information
p. 8766 - 8771
(2021/11/20)
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- Ready Approach to Organophosphines from ArCl via Selective Cleavage of C-P Bonds by Sodium
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The preparation, application, and reaction mechanism of sodium phosphide R2PNa and other alkali metal phosphides R2PM (M = Li and K) have been studied. R2PNa could be prepared, accurately and selectively, via the reactions of SD (sodium finely dispersed in mineral oil) with phosphinites R2POR′ and chlorophosphines R2PCl. R2PNa could also be prepared from triarylphosphines and diarylphosphines via the selective cleavage of C-P bonds. Na was superior to Li and K for these reactions. R2PNa reacted with a variety of ArCl to efficiently produce R2PAr. ArCl is superior to ArBr and ArI since they only gave low yields of the products. In addition, Ph2PNa is superior to Ph2PLi and Ph2PK since Ph2PLi did not produce the coupling product with PhCl, while Ph2PK only gave a low yield of the product. An electron-withdrawing group on the benzene ring of ArCl greatly accelerated the reactions with R2PNa, while an alkyl group reduced the reactivity. Vinyl chloride and alkyl chlorides RCl also reacted efficiently. While t-BuCl did not produce the corresponding product, admantyl halides could give the corresponding phosphine in high yields. A wide range of phosphines were prepared by this method from the corresponding chlorides. Unsymmetric phosphines could also be conveniently generated in one pot starting from Ph3P. Chiral phosphines were also obtained in good yields from the reactions of menthyl chlorides with R2PNa. Possible mechanistic pathways were given for the reductive cleavage of R3P by sodium generating R2PNa and the substitution reactions of R2PNa with ArCl generating R2PAr.
- Ye, Jingjing,Zhang, Jian-Qiu,Saga, Yuta,Onozawa, Shunya,Kobayashi, Shu,Sato, Kazuhiko,Fukaya, Norihisa,Han, Li-Biao
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p. 2682 - 2694
(2020/07/30)
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- Synthesis and properties of heterobimetallic rhodium complexes featuring LiI, CuI or ZnII as a Lewis acidic metalloligand
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A series of [(PMP)Rh(CO)Cl]n+ complexes was synthesised and the impact of the metalloligands CuI, LiI and ZnII on the CO stretching band was analysed.
- Steinhoff, Patrick,Steinbock, Ralf,Friedrich, Anna,Schieweck, Benjamin G.,Cremer, Christopher,Truong, Khai-Nghi,Tauchert, Michael E.
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p. 10439 - 10442
(2018/08/17)
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- A practical synthesis of unsymmetrical triarylphosphines by heterogeneous palladium(0)-catalyzed cross-coupling of aryl iodides with diphenylphosphine
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The heterogeneous cross-coupling reaction of aryl iodides with diphenylphosphine was achieved in DMAc at 130 °C in the presence of 1.0 mol% of MCM-41-supported tridentate nitrogen palladium(0) complex [MCM-41-3N-Pd(0)] with KOAc as base, yielding a variety of unsymmetrical triarylphosphines in good to excellent yields. The turnover frequency (TOF) of the catalyst can reach 30.67 h?1. This new heterogeneous palladium(0) catalyst could easily be prepared by a simple procedure from commercially readily available reagents, and exhibited the same catalytic activity as homogeneous Pd(OAc)2 or Pd(PPh3)4, and could be recovered by filtration of the reaction solution and recycled at least seven times without significant loss of catalytic activity.
- Xu, Zhaotao,Wang, Pingping,Chen, Qiurong,Cai, Mingzhong
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- An efficient heterogeneous cross-coupling of aryl iodides with diphenylphosphine catalyzed by copper (I) immobilized in MCM-41
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The heterogeneous cross-coupling reaction of aryl iodides with diphenylphosphine was achieved in toluene at 115?°C in the presence of 10?mol% of phenanthroline-functionalized MCM-41-supported copper (I) complex (Phen-MCM-41-CuI) with Cs2CO3 as base, yielding various unsymmetric triarylphosphines in good to excellent yields. This protocol can tolerate a wide range of functional groups and does not need the use of expensive additives or harsh reaction conditions. This heterogeneous Cu (I) catalyst exhibited the same catalytic activity as homogeneous CuI/Phen system, and could easily be recovered by a simple filtration of the reaction solution and recycled up to seven times without significant loss of activity.
- Fang, Zhiqiang,Cai, Mingzhong,Lin, Yang,Zhao, Hong
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- Nickel-catalysed P-C bond formation via P-H/C-CN cross coupling reactions
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Nickel-catalysed P-H/C-CN cross coupling reactions take place efficiently under mild reaction conditions affording the corresponding sp2C-P bonds. This transformation provides a convenient method for the preparation of arylphosphines and arylphosphine oxides from the readily available P-H compounds and arylnitriles. This journal is
- Zhang, Ji-Shu,Chen, Tieqiao,Yang, Jia,Han, Li-Biao
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supporting information
p. 7540 - 7542
(2015/05/04)
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- Convenient Formation of Triarylphosphines by Nickel-Catalyzed C-P Cross-Coupling with Aryl Chlorides
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A convenient strategy has been developed for the preparation of various phosphine ligands in good to excellent yields through a nickel-catalyzed C-P bond-forming step. This reaction proceeded smoothly and tolerated a variety of functional groups to provide a new method for the synthesis of important phosphine ligands through the direct cleavage of a C-Cl bond. A convenient strategy has been developed for the preparation of various phosphine ligands in good to excellent yields through a nickel-catalyzed C-P bond-forming step. This reaction proceeded smoothly and tolerated a variety of functional groups to provide a new method for the synthesis of important phosphine ligands through the direct cleavage of a C-Cl bond.
- Sun, Meng,Zang, Yu-Shi,Hou, Le-Kai,Chen, Xiang-Xiang,Sun, Wei,Yang, Shang-Dong
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supporting information
p. 6796 - 6801
(2016/02/18)
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- Heteroleptic, dinuclear copper(i) complexes for application in organic light-emitting diodes
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A series of highly luminescent, heteroleptic copper(I) complexes has been synthesized using a modular approach based on easily accessible P^N ligands, triphenylphosphine, and copper(I) halides, allowing for an independent tuning of the emission wavelength
- Zink, Daniel M.,Volz, Daniel,Baumann, Thomas,Mydlak, Mathias,Fluegge, Harald,Friedrichs, Jana,Nieger, Martin,Braese, Stefan
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p. 4471 - 4486
(2014/01/06)
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- Synthesis, structure, and characterization of dinuclear copper(I) halide complexes with P^N ligands featuring exciting photoluminescence properties
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A series of highly luminescent dinuclear copper(I) complexes has been synthesized in good yields using a modular ligand system of easily accessible diphenylphosphinopyridine-type P^N ligands. Characterization of these complexes via X-ray crystallographic studies and elemental analysis revealed a dinuclear complex structure with a butterfly-shaped metal-halide core. The complexes feature emission covering the visible spectrum from blue to red together with high quantum yields up to 96%. Density functional theory calculations show that the HOMO consists mainly of orbitals of both the metal core and the bridging halides, while the LUMO resides dominantly on the heterocyclic part of the P^N ligands. Therefore, modification of the heterocyclic moiety of the bridging ligand allows for systematic tuning of the luminescence wavelength. By increasing the aromatic system of the N-heterocycle or through functionalization of the pyridyl moiety, complexes with emission maxima from 481 to 713 nm are obtained. For a representative compound, it is shown that the ambient-temperature emission can be assigned as a thermally activated delayed fluorescence, featuring an attractively short emission decay time of only 6.5 μs at φPL = 0.8. It is proposed to apply these compounds for singlet harvesting in OLEDs.
- Zink, Daniel M.,B?chle, Michael,Baumann, Thomas,Nieger, Martin,Kühn, Michael,Wang, Cong,Klopper, Wim,Monkowius, Uwe,Hofbeck, Thomas,Yersin, Hartmut,Br?se, Stefan
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p. 2292 - 2305
(2013/04/10)
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- [NiCl2(dppp)]-catalyzed cross-coupling of aryl halides with dialkyl phosphite, diphenylphosphine oxide, and diphenylphosphine
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We present a general approach to C-P bond formation through the cross-coupling of aryl halides with a dialkyl phosphite, diphenylphosphine oxide, and diphenylphosphane by using [NiCl2(dppp)] as catalyst (dppp=1,3-bis(diphenylphosphino)propane). This catalyst system displays a broad applicability that is capable of catalyzing the cross-coupling of aryl bromides, particularly a range of unreactive aryl chlorides, with various types of phosphorus substrates, such as a dialkyl phosphite, diphenylphosphine oxide, and diphenylphosphane. Consequently, the synthesis of valuable phosphonates, phosphine oxides, and phosphanes can be achieved with one catalyst system. Moreover, the reaction proceeds not only at a much lower temperature (100-120 °C) relative to the classic Arbuzov reaction (ca. 160-220 °C), but also without the need of external reductants and supporting ligands. In addition, owing to the relatively mild reaction conditions, a range of labile groups, such as ether, ester, ketone, and cyano groups, are tolerated. Finally, a brief mechanistic study revealed that by using [NiCl2(dppp)] as a catalyst, the NiII center could be readily reduced in situ to Ni0 by the phosphorus substrates due to the influence of the dppp ligand, thereby facilitating the oxidative addition of aryl halides to a Ni0 center. This step is the key to bringing the reaction into the catalytic cycle. Making bonds: C-P bonds were formed by the Ni-catalyzed cross-coupling of aryl halides and phosphorus substrates without the need of external reductants. Aryl bromides and less reactive aryl chlorides underwent smooth coupling with several different phosphorus substrates to afford phosphonates, phosphine oxides, and phosphines (see scheme; dppp=1,3-bis(diphenylphosphino)propane). Due to the mild reaction conditions, a range of labile groups, such as ether, ester, ketone, and cyano groups, are tolerated. Copyright
- Zhao, Yu-Long,Wu, Guo-Jie,Li, You,Gao, Lian-Xun,Han, Fu-She
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supporting information; experimental part
p. 9622 - 9627
(2012/09/07)
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- Nickel-catalyzed C-P cross-coupling by C-CN bond cleavage
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Prosperous coupling: A nickel-catalyzed C-P cross-coupling reaction with Me3SiPPh2 by carbon-cyano bond cleavage has been developed. This method is characterized by its simplicity and wide application to the synthesis of various monophosphorus and P,N bidentate ligands (see scheme).
- Sun, Meng,Zhang, Hong-Yu,Han, Qi,Yang, Kuo,Yang, Shang-Dong
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supporting information; experimental part
p. 9566 - 9570
(2011/10/05)
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- The AZARYPHOS family of ligands for ambifunctional catalysis: Syntheses and use in ruthenium-catalyzed anti-markovnikov hydration of terminal alkynes
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The family of AZARYPHOS (aza-aryl-phosphane) phosphane ligands, containing a phosphine unit and sterically shielded nitrogen lone pairs in the ligand periphery, is introduced as a tool for developing ambifunctional catalysis by the metal center and nitrogen lone pairs in the ligand sphere. General synthetic strategies have been developed to synthesize over 25 examples of structurally diverse (6-aryl-2pyridyl)phosphanes (ARPYPHOS), (6alkyl-2-pyridyl)phosphanes (ALPY-PHOS), 4,6-disubsituted l,3-diazin-2ylphosphanes or l,3,5-triazin-2- ylphosphanes, quinazolinylphosphanes, quinolinylphosphanes, and others. The scalable syntheses proceed in a few steps. The incorporation of AZARYPHOS ligands (L) into complexes [RuCp(L)2(MeCN)][PF6] (Cp = cyclopentadieny1)gives catalysts for the anti-Markovnikov hydration of terminal alkynes of the highest known activities. Electronic and steric ligand effects modulate the reaction kinetics over a range of two orders of magnitude. These results highlight the importance of using structurally diverse ligand families in the process of developing cooperative ambifunctional catalysis by a metal and its ligand.
- Hintermann, Lukas,Dang, Tuan Thanh,Labonne, Aurelie.,Kribber, Thomas,Xiao, Li,Naumov, Pance
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supporting information; experimental part
p. 7167 - 7179
(2010/02/28)
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- Catalyst-free alcoholysis of phosphane-boranes: a smooth, cheap, and efficient deprotection procedure
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Catalyst-free alcoholytic deprotection of borane-protected phosphorus compounds offers a smooth, efficient, and clean alternative to existing deprotection methods. In this paper we report our results on the general applicability of deprotecting phosphane-
- Van Overschelde, Michel,Vervecken, Elias,Modha, Sachin G.,Cogen, Simon,Van der Eycken, Erik,Van der Eycken, Johan
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experimental part
p. 6410 - 6415
(2009/12/09)
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- Hydroformylation
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The present invention relates to a process for hydroformylating in the presence of a catalyst comprising at least one complex of a metal of transition group VIII with mono-phosphorus compounds which are capable of dimerizing via noncovalent bonds as ligands, to such catalysts and to their use.
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- Preparation of substituted phosphide salts
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Substituted sodium salts of phosphides are prepared by reacting a triarylphosphine with sodium in an aliphatic amine or diamine as a solvent or co-solvent. The resultant phosphides may be further treated with appropriate halides to produce unsymmetrical phosphines.
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- Electrosynthesis of triorganylphosphines from organic halides and chlorophosphines, catalyzed by nickel complexes
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The possibility of cross coupling of organic halides and chlorophosphines under the action of electrochemically generated Ni(0) complexes of 2,2′-bipy is shown. The final triorganylphosphines are formed by several pathways, including reaction of the σ complex of ArNiX with chlorophosphine and electron transfer-induced reductive elimination of Ph2PArNiX, leading to the cross-coupling product.
- Budnikova,Kargin,Sinyashin
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p. 524 - 528
(2007/10/03)
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- The Wittig reaction with pyridylphosphoranes
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The Wittig reaction was studied by replacing one, two, or three phenyl rings in the triphenylethylidenephosphorane (8) with pyridyl rings, which were attached in the alpha position. It is shown that when using n- butyllithium as the base, the yield of the Wittig reaction is severely affected and it is proposed that the formation of a betaine salt adduct as intermediate suppresses the formation of oxaphosphetanes. In contrast, with sodium bis(trimethylsilyl)amide as the base, the yields are similar to the reaction with 8, although the Z-selectivity reaches values of over 18:1. The reactions have been monitored by 31p NMR spectroscopy and the position of the pyridyl ring in the oxaphosphetane 4a elucidated by ROESY NMR spectroscopy at low temperatures.
- Schroeder, Uwe,Berger, Stefan
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p. 2601 - 2604
(2007/10/03)
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- Nickel-catalysed electrochemical coupling between mono- or di-chlorophenylphosphines and aryl or heteroaryl halides
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Nickel-catalysed electrochemical cross-coupling between aryl- or heteroaryl-halides and chlorodiphenylphosphine or dichlorophenylphosphine affords tertiary phosphines in good to high yields.
- Budnikova, Yulia,Kargin, Yuri,Nedelec, Jean-Yves,Perichon, Jacques
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- Palladium diphenyl-2-pyridylphosphine complexes
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The stoichiometric reaction of diphenyl-2-pyridylphosphine (Ph2PC5H4N-2) and palladium(II) acetate afforded the palladium(I) dimer [Pd2(μ-Ph2PC5H4N) 2(OAc)2] 1. Attempts to isolate the monomer, [Pd(μ-Ph2PC5H4N)2(OAc) 2], from 2:1 stoichiometry reactions (Ph2PC5H4N:Pd), resulted only in the isolation of 1. When >3 mole equivalents of Ph2PC5H4N were used the zerovalent palladium complex [Pd(Ph2PC5H4N)3] was isolated. Other palladium(I) dimers with carboxylic or sulfonic anionic ligands have been prepared by a metathesis reaction of the co-ordinated acetates. The complexes 1 and [Pd2(μ-Ph2PC5H4N) 2(O2CCF3)2] 2 have been structurally characterised as head-to-tail dimers. The mononuclear complex [Pd(Ph2PC5H4N)2(O 2CCF3)2] has been obtained by reaction of Ph2C5H4N with [Pd(CH3CN)2(O2CCF3)2]. Complex 1 reacts with dimethyl acetylenedicarboxylate to give [Pd2(μ-Ph2PC5H4N) 2-(OAc)2(μ-MeO2CC=CCO2Me)], while attempts to isolate an A-frame carbonyl complex were unsuccessful.
- Dervisi, Athanasia,Edwards, Peter G.,Newman, Paul D.,Tooze, Robert P.,Coles, Simon J.,Hursthouse, Michael B.
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p. 3771 - 3776
(2007/10/03)
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- Process for the preparation of diarylphosphino pyridines
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The invention relates to a process for the preparation of a diarylphosphino pyridine comprising the steps of: a) reacting a triaryl phosphine with about two equivalents of an alkali metal in a substantially aprotic solvent medium to form an alkali diarylphosphide and an alkali aryl; b) selectively eliminating the alkali aryl formed; c) reacting the alkali diarylphosphide with about one equivalent per halide group of an optionally substituted pyridyl halide; and d) separating the diarylphosphino pyridine formed.
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- Process for the preparation of a butene
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Process for the preparation of 1-butene by dimerization of ethylene in the presence of an aprotic solvent and a catalytic system prepared by combining (a) a Pd compound, (b) an anion of an acid having a pKa = 1 N atoms which atoms bear no H atoms and in which compound each N atom is connected to the P atom by an organic bridging group containing >= 1 C atom in the bridge.
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- Reactivity of 2-(Diphenylphosphino)pyridine toward Complexes Containing the Quadruply Bonded Re26+ Core: Ortho Metalation and Redox Chemistry
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The quadruply bonded dirhenium(III) complexes (n-Bu4N)2Re2Cl8 and Re2Cl6(PR3)2 (R = Et or n-Bu) react in methanol with 2-(diphenylphosphino)pyridine (Ph2Ppy) to afford complexes that are derivatives of the triply bonded dirhenium(II) core, Re24+.The complex Re2Cl4(Ph2Ppy)3 (I) is formed initially and is found to eliminate HCl to give the ortho-metalated complex Re2Cl3(Ph2Ppy)2 (II), the first example of a reaction of this type occurring at a metal-metal multiple bond of the M2L8 type.Both chloride and hexafluorophosphate salts of the 2+ dication (III) have been isolated (Cl-, IIIa; PF6-, IIIb); III constitutes a rare example of a multiply bonded dimetal unit complexed by four neutral bridging ligands. Cl2 can be converted to either I or II under certain conditions.When acetone is used as the solvent, then Re2Cl6(PR3)2 reacts with Ph2Ppy to give Re2Cl4(Ph2Ppy)2(PR3) (R = Et, IVa; R = n-Bu, IVb), whereas with acetonitrile as the solvent, Ph2Ppy converts (n-Bu4N)2Re2Cl8 to the dirhenium(III) complex Re2(μ-Cl)2(μ-Ph2Ppy)2Cl4; i.e., substitution occurs but without concomitant reduction.The complexes II, IIIb, and IVa have been structurally characterized by X-ray crystallography.Compound II crystallizes in space group P21/n with a = 12.160 (6) Angstroem, b = 21.418 (7) Angstroem, c = 18.464 (2) Angstroem, β = 99.04 (3)o, and Z = 4.Complex IIIb forms crystals in space group P21/c with a = 24.316 (3) Angstroem, b = 12.101 (2) Angstroem, c = 27.070 (3) Angstroem, β = 105.670 (9)o, and Z = 4.Two acetone molecules per dimer unit are also present in the lattice.Compound IVa crystallizes in space group P1 with a = 10.683 (2) Angstroem, b = 20.033 (5) Angstroem, c = 10.544 (3) Angstroem, α = 102.29 (3)o, β = 107.69 (2)o. γ = 94.19 (2)o, and Z = 2.
- Barder, Timothy J.,Cotton, Albert F.,Powell, Gregory L.,Tetrick, Stephen M.,Walton, Richard A.
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p. 1323 - 1332
(2007/10/02)
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- PHOSPHORORGANISCHE VERBINDUNGEN 102. TERTIAERE PHOSPHINE MIT o-DIALKYLAMINOPHENYL- UND ORTHO-DIALKYLAMINOBENZYLGRUPPEN
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N,N-dialkylarylamines and N,N-dialkylbenzylamines are lithiated with n-butyllithium (n-BuLi) under the assistance of tetramethylethylenediamine (TMEDA) in the ortho-position.According the Eqs. (1) and (4) triarylphosphines (30-50percent) are obtained. 1-(N,N-dimethylamino)-naphthalene and N,N-dimethyl-1-(1-naphthyl)-ethylamine 18 are lithiated in the 8-position.In N,N-dimethyl-1-(2-naphthyl)-ethylamine 19 the 1- and 3-position is lithiated in nearly equal amount.Experiments to introduce lithium twice into the model compounds 28-30 are without success.
- Horner, L.,Simons, G.
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p. 165 - 176
(2007/10/02)
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- New Organophosphorus Ligands: 2-Pyridyl-phosphanes, -phosphanemethylenes, and phosphaneboranes
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Diphenyl(2-pyridyl)phosphane, bis-2-pyridyl(phenyl)phosphane, and tris-2-pyridyl-phosphane (1a-c) are prepared from 2-pyridyl-lithium and the corresponding chlorophosphanes.These phosphanes can be converted into the methylene compounds via the methylphosp
- Schmidbaur, Hubert,Inoguchi, Yoshio
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p. 1329 - 1334
(2007/10/02)
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