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【求助】鎳催化劑的制備
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請問一下各位高手,如何制備Ni(dppp)Cl2 1,3-bis(diphenylphosphino)propane]dichloro nickel(Ⅱ) 希望能提供相關(guān)合成文獻(xiàn),還有,有沒有在制備過程中需要特別注意的地方。 不甚感激。 [ Last edited by jerryak47 on 2010-11-17 at 22:57 ] |
» 搶金幣啦!回帖就可以得到:
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購買 不是太貴啊,說不定合成成本也這個(gè)價(jià)格 http://www.chemicalbook.com/Chem ... ty_CN_CB3416370.htm ‘ wiki 中就有啊 ,http://en.wikipedia.org/wiki/Dic ... hino)propane)nickel 里面的第一篇文獻(xiàn)。 Preparation NiCl2(dppp) is prepared by combining equal molar portions of nickel(II) chloride hexahydrate with 1,3-bis(diphenylphosphino)propane in 2-propanol.[1] Ni(H2O)6Cl2 + dppp → NiCl2(dppp) + 6 H2O [edit]Reactions It is used in Grignard reagent reactions involving cross-coupling of aryl halides, converting enol ethers, dithioacetals, and vinyl sulfides to olefins. NiCl2(dppp) is used because the douple phosphate ligand minimizes the reduction reactions with labile β-hydrogens. [2] Cross-coupling reactions of R-X compounds with organometallic nucleophiles are catalyzed by transition metal complexes such as NiCl2(dppp). The R group consists of aryl, vinyl, or allyl groups and the X group is a good leaving group. Cross-coupling reactions are effective at producing carbon-carbon bonds. Catalysts that have bidentate phosphine ligands serve as the best catalysts.[3] NiCl2(dppp) serves as the catalyst by bonding the two cross-coupling components to the nickel. The cross-coupling proceeds by oxidative addition of the aryl, vinyl, or allyl halide to NiCl2(dppp) forming an oxidative addition adduct, R1-NiCl(dppp). The organometallic nucleophile, R2-MgBr, reacts with R1-NiCl(dppp) and is followed by the cross-coupling reaction producing the R1-R2 product. [4] The compound is a catalyst for Kumada coupling reactions involving alkyl, alkenyl, aryl, and heteroaryl Grignard reagents with aryl, heteroaryl, and alkenyl halides. [1] [edit]References ^ a b Kumada, Makota; Tamao, Kohei; Sumitani, Koji (1988), "Phosphine-Nickel Complex Catalyzed Cross-Coupling of Grignard Reagents with Aryl and Alkenyl Halides: 1,2-dibutylbenzene", Org. Synth.; Coll. Vol. 6: 407 |




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