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jerryak47(½ð±Ò+2):лл²ÎÓë
jinkai838(½ð±Ò+1):лл1 2010-11-19 00:06:44
jerryak47(½ð±Ò+2):лл²ÎÓë
jinkai838(½ð±Ò+1):лл1 2010-11-19 00:06:44
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¹ºÂò ²»ÊÇÌ«¹ó°¡£¬Ëµ²»¶¨ºÏ³É³É±¾Ò²Õâ¸ö¼Û¸ñ http://www.chemicalbook.com/Chem ... ty_CN_CB3416370.htm ¡® wiki ÖоÍÓа¡ £¬http://en.wikipedia.org/wiki/Dic ... hino)propane)nickel ÀïÃæµÄµÚһƪÎÄÏס£ 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 ¡ú 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 ¦Â-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 |
4Â¥2010-11-18 18:58:16
2Â¥2010-11-18 09:55:36
3Â¥2010-11-18 18:31:59
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