- Pyridyl- and pyrimidyl-phosphine-substituted [FeFe]-hydrogenase mimics: Synthesis, charaterization and properties
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Two tetranuclear iron-sulphur complexes {[(μ-pdt)Fe2(CO) 5]2(PNP) (2) and [(μ-pdt)Fe2(CO) 5]2(PNNP) (3)} and three dinuclear ones {[(μ-pdt)Fe2(CO)5](PNP) (4), [(μ-pdt)
- Cui, Hong-Hua,Wu, Nan-Nan,Wang, Jin-Yun,Hu, Ming-Qiang,Wen, Hui-Min,Chen, Chang-Neng
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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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- Early transition metal compound and preparation method thereof and intermediate and application in olefin polymerization
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The invention relates to the field of catalysts for olefin polymerization, in particular to an early transition metal compound and a preparation method thereof and an intermediate and application in olefin polymerization. The early transition metal compound is the compound shown in a formula (1) (please see the specification for the formula). By adopting the early transition metal compound or crystal catalytic olefin, catalytic activity is high, and the catalytic activity under wide polymerization conditions is excellent, and a catalyst is low in cost and is conducive to industrial production.
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Paragraph 0317-0322
(2019/11/13)
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- Early transition metal compound and preparation method and intermediate thereof and application of early transition metal compound in polymerization of olefin
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The invention relates to the field of catalysts for olefin polymerization, in particular to an early transition metal compound and a preparation method and intermediate thereof and application of theearly transition metal compound in polymerization of olefin. The early transition metal compound is a compound represented by a formula (1). When the early transition metal compound or crystal of theearly transition metal compound is applied to catalysis of olefin, high catalytic activity is achieved, and excellent catalytic activity is achieved in a wide range of polymerization conditions; and the catalyst has low cost, and is favorable for industrial production.
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Paragraph 0319; 0320; 0322; 0323; 0324
(2019/11/13)
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- Sterically hindered iminophosphorane complexes of vanadium, iron, cobalt and nickel: a synthetic, structural and catalytic study
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Bis(aryliminophosphoranyl)alkanes L1 = (CH2)n(R12P=NR2)2 (n = 1 or 2, R1 = Ph or Me, R2 = Ph, C6H2Me3-2,4,6 or C6H3Pri2-2,6) reacted with cobalt and nickel dihalides to give chelate complex
- Al-Benna, Sarah,Sarsfield, Mark J.,Thornton-Pett, Mark,Ormsby, Daniel L.,Maddox, Peter J.,Bres, Philippe,Bochmann, Manfred
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p. 4247 - 4257
(2007/10/03)
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- Regioselective functionalisation of 2-(diphenylphosphino)pyridine: Direct lithiation at the pyridine C-6 position
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It is shown that 2-(diphenylphosphino)pyridine was efficiently and regioselectively metallated at the C-6 position by use of the BuLi- Me2N(CH2)2OLi basic system. The method described opened access to various functionally
- Gros, Philippe,Younès-Millot, Christophe Ben,Fort, Yves
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p. 303 - 306
(2007/10/03)
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- Water soluble phosphines VIII. Palladium-catalyzed P-C cross coupling reactions between primary or secondary phosphines and functional aryliodides - A novel synthetic route to water soluble phosphines
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Tertiary phosphines Ph2P-Ar and PhP(Ar)2 containing mono-and disubstituted aromatic ring systems Ar (Ar = C6H4-X and C6H3-XY; X, Y = Me, OH, NH2, COOH, COOMe and SO3Na) are accessible in good yields by Pd(0)-catalyzed cross coupling reactions between diphenylphosphine or phenylphosphine and substituted aryliodides I-C6H4-X or I-C6H3-XY in organic solvents (dimethylacetamide, acetonitrile, methanol) using organic amines or potassium and sodium acetate as bases. If the primary phosphine is employed in the appropriate stoichiometric ratio, functionalized secondary phosphines, e.g. Ph(H)P-C6H4-p-SO3Na, may be obtained selectively.
- Herd, Oliver,Hessler, Antonella,Hingst, Martin,Tepper, Michael,Stelzer, Othmar
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- Carbonylation catalyst system
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The invention relates to a catalyst system, which comprises a source of a Group VIII metal and a polyphosphine. The invention further relates to a process for the preparation of alpha, beta-olefinically unsaturated compounds utilizing this catalyst system
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