Syntheses of Di(cyclopentadienyl) metal derivatives by use of Di(cyclopentadienyl)magnesium

Reid, AF; Wailes, PC

doi:10.1071/ch9660309

Cited by 24 publications

(6 citation statements)

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“…Materials. Ln(C 5 H 5 ) 3 (Ln = Y, La, Nd, Sm, Gd, Tb, Er, Yb, Lu), (C 5 H 5 ) 2 Co, TiCl 2 (C 5 H 5 ) 2 , ZrCl 2 (C 5 H 5 ) 2 , [(C 8 H 12 )RhCl] 2 , (C 8 H 12 ) 2 PdCl 2 , (C 5 H 5 ) 2 YbCl, and (C 5 H 5 ) YbCl 2 18 were prepared with the established methods. Commercial samples of Mn(acac) 3 , Ph 4 Sn, CaI 2 , Y(OiPr) 3 , Y(O 2 CC 10 H 7 ) 3 , Sm(acac) 3 , Sm(OiPr) 3 , Y 2 O 3 , and Yb 2 O 3 were purchased from Strem Chemicals Inc. F400 (Filtrasorb 400) activated carbon was purchased from Toyo Cargone (BET surface area, 946 m 2 /g, mesopore ratio 9.7%, averaged pore size 24.0 Å, powder size 0.9−1.1 mm; its origin is bituminoous coal).…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Extremely Large Mesoporous Activated Carbon and Its Unique Adsorption for Giant Molecules

et al. 1996

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The steam invigoration of pitches (softening points 85 and 280 °C) homogenized with 1−3 wt % of organo rare-earth metal complexes such as Ln(C5H5)3 or Ln(acac) (Ln = Y, Yb) at 930 °C provided activated carbons with an extremely high mesopore ratio, >70%. The resulted activated carbon selectively adsorbs giant molecules such as vitamin B12, blue acid 90 dye, dextran, nystatin, and humic acid, reflecting their large mesopore volumes. To understand what kind of carbon skeleton in pitch is suited for generation of high mesopore ratio, the steam invigoration of a series of condensed polynuclear aromatics (COPNA) resins prepared from naphthalene, anthracene, phenanthrene, pyrene, or perylene and p-xylene-α,α‘-diol were conducted in the presence of rare-earth metal complexes. As a result, COPNA resins containing phenanthrene, perylene, and pyrene generated large mesopore volume.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Extremely Large Mesoporous Activated Carbon and Its Unique Adsorption for Giant Molecules

et al. 1996

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“…The origination of Cp 2 TiCl in the reaction mixture was not investigated in the present work, but there are two possible ways in which it could be formed. One is the reaction of TiCl 3 with Cp 2 Mg. 16 However, it is not clear how Cp 2 Mg could originate in the reaction mixture before the formation of the catalytically active particles. It was proven that Cp 2 Mg cannot be formed by the direct reaction of CpH with magnesium in the absence of a catalyst or by a homogeneous reaction of CpH with I.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of magnesium dicyclopentadienide catalyzed by titanium and vanadium derivatives

Maslennikov

Ignatyev

Piskounov

et al. 2001

Applied Organom Chemis

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Synthesis of magnesium dicyclopentadienide from metal and cyclopentadiene in THF is effectively catalyzed by the derivatives of vanadium and titanium. The kinetics of the synthesis, as well as thermodynamic parameters of reagents adsorption on the magnesium surface, have been determined. The process catalyzed by titanium derivatives is accompanied by the quantitative hydrogenation of cyclopentadiene to cyclopentene whereas the catalysis by vanadium derivatives leads to hydrogen gas evolution. A number of reaction intermediates including Cp 2 TiCl, Cp 2 TiH 2 MgCl, Cp 2 Ti(cyclo-C 5 H 7 ) and Cp 2 V, were identified by the electron spin resonance method. The equilibrium constants, enthalpies and entropies of adsorption of metal halides on the magnesium surface were calculated.

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“…While reliable synthetic routes to group IV M(C 5 H 5 ) 2 X 2 (X = halide) complexes have been long available, that has not been the case for their M(C 5 H 5 )X 3 analogues. Nonetheless, various approaches have been developed for their syntheses, or for adducts such as Zr(C 5 H 5 )Cl 3 (dme), with the chlorination of Zr(C 5 H 5 ) 2 Cl 2 probably receiving the most attention . However, even that approach can lead to contamination by tetrahalide impurities.…”

Section: Introductionmentioning

confidence: 99%

Isolation and Characterization of Bromination Products of Zr(C₅H₅)₂Br₂

2008

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The reaction of Zr(C 5 H 5 ) 2 Br 2 with bromine can be used as an effective route to Zr(C 5 H 5 )Br 3 . Through the slow addition of reactants, Zr(C 5 H 5 )Br 3 can be isolated in crystalline form. An X-ray diffraction study has revealed it to exist as a one-dimensional polymer, isomorphous with Zr(C 5 H 5 )Cl 3 . In the presence of excess bromine, additional loss of C 5 H 5 occurs, leading to the formation of the salt complex [Zr 3 (C 5 H 5 ) 3 Br 3 (µ 2 -Br) 3 (µ 3 -Br) 2 ] + [Zr 2 Br 9 ] -, as well as additional products. However, use of Zr(C 5 H 5 ) 2 Br 2 that has been exposed to air leads to traces of a water complex, Zr 2 (C 5 H 5 ) 2 Br 4 (µ 2 -Br) 2 (µ 2 -H 2 O), which has been revealed through a structural study as having a confacial bioctahedral geometry, with the water serving as one of the three bridging ligands.

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Syntheses of Di(cyclopentadienyl) metal derivatives by use of Di(cyclopentadienyl)magnesium

Cited by 24 publications

References 0 publications

Synthesis of Extremely Large Mesoporous Activated Carbon and Its Unique Adsorption for Giant Molecules

Synthesis of Extremely Large Mesoporous Activated Carbon and Its Unique Adsorption for Giant Molecules

Synthesis of magnesium dicyclopentadienide catalyzed by titanium and vanadium derivatives

Isolation and Characterization of Bromination Products of Zr(C₅H₅)₂Br₂

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Syntheses of Di(cyclopentadienyl) metal derivatives by use of Di(cyclopentadienyl)magnesium

Cited by 24 publications

References 0 publications

Synthesis of Extremely Large Mesoporous Activated Carbon and Its Unique Adsorption for Giant Molecules

Synthesis of Extremely Large Mesoporous Activated Carbon and Its Unique Adsorption for Giant Molecules

Synthesis of magnesium dicyclopentadienide catalyzed by titanium and vanadium derivatives

Isolation and Characterization of Bromination Products of Zr(C5H5)2Br2

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Isolation and Characterization of Bromination Products of Zr(C₅H₅)₂Br₂