Synthesis of ansa-metallocene catalysts

Jordan, R F; Rodewald, S; Diamond, G M

Title: Synthesis of ansa-metallocene catalysts

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Abstract

A process is described for preparing in high yield ansa-metallocene complexes and rac-ansa-metallocene complexes by reacting an ansa-bis-cyclopentadiene compound with a metal amide complex.

Inventors:: Jordan, R F; Rodewald, S; Diamond, G M

Issue Date:: 1996-02-27

Research Org.:: University of Iowa

OSTI Identifier:: 201500

Patent Number(s):: 5495035

Application Number:: PAN: 8-252,591; CNN: Grant CHE90-22700

Assignee:: Univ. of Iowa Research Foundation, Iowa City, IA (United States)

DOE Contract Number:: FG02-88ER13935

Resource Type:: Patent

Resource Relation:: Other Information: PBD: 27 Feb 1996

Country of Publication:: United States

Language:: English

Subject:: 40 CHEMISTRY; CATALYSTS; CHEMICAL PREPARATION; CYCLOPENTADIENE; CHEMICAL REACTIONS; AMIDES; ORGANOMETALLIC COMPOUNDS; CHEMICAL REACTION YIELD

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                    Jordan, R F, Rodewald, S, and Diamond, G M. Synthesis of ansa-metallocene catalysts.  United States: N. p., 1996. 
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                    Jordan, R F, Rodewald, S, & Diamond, G M. Synthesis of ansa-metallocene catalysts.  United States.

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                    Jordan, R F, Rodewald, S, and Diamond, G M. Tue .  
        "Synthesis of ansa-metallocene catalysts".  United States.

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@article{osti_201500,

  title        = {Synthesis of ansa-metallocene catalysts},

  author       = {Jordan, R F and Rodewald, S and Diamond, G M},

  abstractNote = {A process is described for preparing in high yield ansa-metallocene complexes and rac-ansa-metallocene complexes by reacting an ansa-bis-cyclopentadiene compound with a metal amide complex.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1996},

  month        = {2}

}

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A series of phosphorus-bridged ansa-metallocene complexes of titanium, zirconium, and hafnium, [PhP(XC{sub 5}Me{sub 4}){sub 2}]MX{sub 2} and [Ph(E)P(C{sub 5}Me{sub 4}){sub 2}]MX{sub 2} (X = Cl, Me, CO, (Se{sub 3}){sub 0.5}; E = O, S, Se), has been synthesized. Structural characterization by X-ray diffraction indicates that, in comparison to their non-ansa counterparts (C{sub 5}Me{sub 5}){sub 2}MX{sub 2}, the cyclopentadienyl groups in phosphorus-bridged complexes are displaced from symmetric {eta}{sup 5}-coordination toward {eta}{sup 3}-coordination. Such {eta}{sup 3},{eta}{sup 3}-coordination creates more electrophilic metal centers than those in their permethylcyclopentadienyl counterparts, as judged by the {nu}(CO) stretching frequencies of the zirconium dicarbonyl complexes Cp{sup *}{submore » « less
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