ansa-Metallocenderivate des Samariums und Ytterbiums mit ‘weichen’ Donorliganden
作者:Frank T. Edelmann、Melanie Rieckhoff、Ionel Haiduc、Ioan Silaghi-Dumitrescu
DOI:10.1016/0022-328x(93)80239-8
日期:1993.4
derivative chemistry of the organolanthanide(II) complexes [Me4C2(C5H4)2]SM (1) and [Me4C2(C2H4)2]Yb (2) has been investigated. Oxidation of 2 with tBUCI affords the chloro-bridged binuclear ytterbium(III) complex (μ-Cl)2[Me4C2(C2H4)2]Yb}2(4). In contrast, treatment of 1 with tBuCI yields the mononuclear derivative [Me4C2(C5H4)2]SmCl(THF) (3). An organosamarium(III) selenolate, [Me4C2(C5H4)2]Sm(SeMes) (5)
研究了有机镧系元素(II)配合物[Me 4 C 2(C 5 H 4)2 ] SM(1)和[Me 4 C 2(C 2 H 4)2 ] Yb(2)的派生化学。用t BUCI氧化2得到氯桥联的双核(III)络合物(μ-Cl)2 [Me 4 C 2(C 2 H 4)2 ] Yb} 2 (4)。相反,用t BuCl处理1得到单核衍生物[Me 4 C 2(C 5 H 4)2 ] SmCl(THF)(3)。通过还原Se-Se键的裂解,由1和二烯丙基亚硒酸酯制备硒酸有机sa (III),[Me 4 C 2(C 5 H 4)2 ] Sm(SeMes)(5)。类似地,二硫代氨基甲酸酯和二硫代磷酸酯[Me 4 C 2(C 5 H 4)2 ] Ln(S 2 CNMe 2)(Ln = Sm(6),Yb(7))和[Me 4 C 2(C 2 H 4)2 ] Ln S 2 P(OMe)2 }(Ln = Sm (8),
Transition metal complex, process for producing the same, olefin polymerization catalyst containing the transition metal complex and process for producing olefin polymers
申请人:Sumitmo Chemical Company, Limited
公开号:US06329478B1
公开(公告)日:2001-12-11
The present invention relates to a transition metal complex, a process for producing the same, a polymerization catalsyt containing the transition metal complex and a process for producing polymers which uses the catalysts.
Synthesis and properties of sterically congested cyclopentadienes and their transition metal complexes
作者:T.Jeffrey Clark、Christopher M. Killian、Sanjay Luthra、Terence A. Nile
DOI:10.1016/0022-328x(93)83365-3
日期:1993.12
The synthesis of 1,3-dialkyl substituted cyclopentadienes, C5H4RR′, Cp′H (Va–g) (where R and R′ are tert-butyl, iso-propyl, neo-pentyl, cyclohexyl, or 1-methylcyclohexyl) is reported. These are synthesized by the nucleophilic addition of methyl or hydride anions to the corresponding 2-alkyl-6,6-dialkylfulvenes (IIIa–f) followed by hydrolysis. These substituted 1,3-cyclopentadienes have been converted
1,3-二烷基取代的环戊二烯,C 5 H 4 RR',CP'H(Va–g)(其中R和R'为叔丁基,异丙基,新戊基,环己基或1-甲基环己基)。这些是通过将甲基或氢化物阴离子亲核加成到相应的2-烷基-6,6-二烷基富勒烯(IIIa–f)中,然后水解而合成的。这些取代的1,3-环戊二烯已转化为有机金属衍生物例如[CP'Fe(CO)2 ] 2,[CP'M(CO)3本人](MMo或W)和CP' 22Fe。为了研究取代的环戊二烯基配体的空间和电子性质,已经研究了所选配合物的光谱和电化学性质。
Catalyst components and their use in the polymerization of olefins
申请人:Marin Vladimir
公开号:US20050148460A1
公开(公告)日:2005-07-07
Catalyst compositions and processes for the polymerization of ethylenically unsaturated monomers to produce polymers specific to the polymerization of propylene to produce isotactic polypropylene and copolymer, specifically an ethylene-propylene copolymer. An olefin polymerization catalyst is characterized by the formula:
B(FluA)MQ
n
wherein Flu is a fluorenyl group substituted at the 4(5) position by a bulky hydrocarbyl group having at least 3 carbon atoms, A is a substituted or unsubstituted cyclopentadienyl or indenyl group or a heteroorgano group, XR, in which X is a heteroatom from Group 15 or 16 such as nitrogen. R is an alkyl group or cycloalkyl group or a mononuclear aromatic group which may be substituted or unsubstituted. B is a structural bridge which imparts stereorigidity to the ligand structure. The bridge B is characterized by the formula ER′R″, in which E is a carbon, silicon or germanium atom, and R′ and R″ are each independently an alkyl group, an aromatic group or a cycloalkyl group. M is a Group 4 or Group 5 transition metal such as titanium, zirconium or hafnium. Q is chlorine, bromine, iodine, an alkyl group, an amino group or an aromatic group. n is 1 or 2. The fluorenyl group may be substituted at both of the 4 or 5 positions with a bulky hydrocarbyl group containing at least 3 carbon atoms. A may take the form of an indenyl group which is substituted or unsubstituted, or a cyclopentadienyl group which is substituted at the 3 or the 3 and 5 positions. The fluorenyl group may be mono-substituted at the 4 (or 5) position and is otherwise unsubstituted or is di-substituted at the 2,7 positions with alkyl or phenyl or substituted phenyl groups.
The synthesis, crystalstructure and propene polymerization behaviour of four bridged zirconocene dichlorides is presented. All catalysts are capable of isotactic propene polymerization. Methyl substitutions at the 2-, 4- and 7-positions of the bridged bis(indenyl)zirconocene dichlorides were introduced. The methyl substituent in the 7-position of the idenyl ring induces a significant steric interaction