Convenient synthesis of new binucleating ligands derived from 1,3-diacetylbenzene. Possible precursors for oligomeric organometallic materials
作者:Dominique Matt、Alain Van Dorsselaer
DOI:10.1016/s0277-5387(00)86075-1
日期:1991.1
Bis-phosphine 1,3-bis(diphenylphosphinoacetyl)benzene (LH2) is obtained in high yield by reacting Ph2PCl with bis(lithium anolate) derived from 1,3-diacetylbenzene in tetrahydrofuran. Its oxidation by air gives quantitatively the corresponding double beta-ketophosphine oxide. The ligand LH2 reacts with [(omicron-C6H4CH2NMe2)PdCl]2 to give the binuclear complex [(omicron-C6H4CH2NMe2)PdCl}2(mu-LH2)] in which the bis-phosphine behaves as a bridging ligand. The latter complex is conveniently converted by prolonged treatment with sodium hydride in tetrahydrofuran into the bis-enalto complex [(omicron-C6H4CH2NMe2)Pd}2(mu-L)] in which the bridging ligand L contains two chelating subunits. Reaction of LH2 with [Pd(acac)2] leads to oligomeric material of formula (PdL)n. Mass spectroscopic measurements suggest the presence of a tetrameric species, (PdL)4, present in the reaction mixture.
Nickel complexes with heterofunctionalized phosphine ligands. Catalytic oligomerization of ethylene with [Ni(C<sub>5</sub>Ph<sub>5</sub>){Ph<sub>2</sub>PCHC(O)Ph}]
作者:Dominique Matt、Michael Huhn、Jean Fischer、André De Cian、Wolfgang Kläui、Igor Tkatchenko、Michel C. Bonnet
DOI:10.1039/dt9930001173
日期:——
bar of ethylene, selectivities of up to 98% towards linear α-olefins were achieved. Protonation of the bimetallic complex 2 with HBF4 gave the cationic complex [Ni(C5Ph5)Ph2PCH2C(O)(C5H4)Fe(C5H5)}]BF46. Crystais of 6 belong to the orthorhombic space group Pbca with a= 19.427(6), b= 38.595(11), c= 13.001(4)Å and Z= 8. The structure was refined to R= 0.049 (R′= 0.067). The bonding of C5Ph5 contrasts
[Ni(C 5 Ph 5)Br(CO)]与Ph 2 PCH 2 C(O)Ph在1,8-双(二甲基氨基)萘(质子海绵)存在下的反应得到螯合物[Ni(C 5 Ph 5)Ph 2 PCH C(O)Ph}] 1。配合物[Ni(C 5 Ph 5)Ph 2 PCH C(O)(C 5 H 4)Fe(C 5 H 5)}] 2,[Ni(C 5 Ph 5)Ph 2 PCH C(O )(1,3-C 6 H 4)C(O)HCPPh 2 } Ni(C 5 Ph 5)] 3,[Ni(C 5 H 5)Ph 2 PCH C(O)Ph}] 4和[Ni(C 5 H 5)Ph 2 PCH C(O) (C 5 H 4)Fe(C 5 H 5)}] 5已使用适当的膦配体并采用与1相似的方法合成。配合物1,被NaBH 4激活在乙烯的低压低聚中表现出催化活性。在130°C和38 bar的乙烯压力下,对线性α-烯烃的选择性高达98%。用HBF