- Bis(aqua)bis(η5-cyclopentadienyl)vanadium(IV) bis(trifluoromethanesulfonate) tetrahydrofuran solvate: Synthesis and characterization
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The reactivity pattern of [V(Cp)2Cl2] towards the weakly coordinating CF3SO3- anion in the absence of chelating or bridging organic ligands has been investigated, where Cp- is the η5/
- Stamatatos, Theocharis C.,Perlepes, Spyros P.,Raptopoulou, Catherine P.,Terzis, Aris,Klouras, Nikolaos
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- Vanadacyclopropene Phosphane Cp2V(η2-PhC=C)P(C=CPh)Ar
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Treatment of the bis(alkynyl)phosphane Ar-P(C=CPh)2 (3) (Ar = 2,4,6-t-Bu3C6H2) with Cp2V gives the vanadacyclopropene phosphane 5, which was characterized by X-ray diffraction. The reactivity of 5 tow
- Choukroun, Robert,Miquel, Yannick,Donnadieu, Bruno,Igau, Alain,Blandy, Claudine,Majoral, Jean Pierre
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- New 1,1′-ring-substituted vanadocene bichlorides. Crystal structures of [V(η5-C5H4SiMe3) 2Cl2] and [V(η5-C5H5)2Cl2]
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The 1,1′-ring-substituted vanadocene dichlorides [V(η5-C5H4R)2Cl2] (R = CMe3, SiMe3, SiEt3) have been prepared from VCl4 and the appropriate lithiated cyclopentadiene, C5H4RLi, in 1:2 ratios. All complexes were characterized by elemental microanalysis and IR spectroscopy. The crystal structures of [V(η5-C5H4SiMe3) 2Cl2] 3 and the parent compound [V(η5-C5H5)2Cl2] 1 have been determined by X-ray diffraction and are in accordance with expectations. Compound 1 crystallizes with two crystallographically independent molecules in its monoclinic unit cell. These two molecules are quite similar in their essential structural features. Compound 3 crystallizes in the triclinic space group P1. The trimethylsilylcyclopentadienyl rings are bound in a staggered relative orientation. Johann Ambrosius Barth 1996.
- Tzavellas,Klouras,Raptopoulou
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- Reaction of Vanadocene with p-Isocyanatobenzenesulfonyl Isocyanate and Thionyl Chloride
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The reaction of p-O=C=NC6H4SO2N=C=O with (η5-C5H5)2V(Cp2V) produces Cp2V(CO) and Cp2V(O=C=NSO2C6H4-p)NC(O)(p-C 6H4SO2N=C=O)VCp2 or Cp2V(H2NSO2C6H 4-p)NC(O)NC(O)N(p-C6H4SO2NH 2)VCp2, depending on reactant ratio. The reaction of Cp2V with SOCl2 gives cyclic vanadocene complexes Cp2V·SOCl2 and (Cp2V)2·SOCl2.
- Gordetsov,Levakova,Zimina,Cherkasov,Kulagina
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p. 767 - 769
(2007/10/03)
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- Reactions of vanadocene and its monochloride with p-toluenesulfonyl chloride
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The reactions of Cp2V and Cp2VCI with p-toluenesulfonyl chloride were studied. Depending on the ratio of the reagents, the solvent, and other reaction conditions, the compounds p-MeC6H4SO2VCp2/s
- Gordetsov,Latyaeva,Zimina,Levakova,Cherkasov,Moseeva,Skobeleva
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p. 1214 - 1217
(2007/10/03)
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- Stereospecific protonation of coordinated alkynes
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The reaction of 5-C5H5)2(η2-PhCCPh)> with anhydrous HCl in tetrahydrofuran gives 5-C5H5)2Cl2> together with cis-PhCHCHPh (ca. 85percent) and trans-PhCHCHPh (ca. 15percent).Kinetic studies indicate that the formatio
- Henderson, Richard A.,Lowe, David J.,Salisbury, Philip
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p. C22 - C25
(2007/10/02)
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- PHOTOLYSIS OF (η5-C5H5)2V(CH3)2. II. PHOTO-INDUCED FORMATION OF ETHANE
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Photolysis of (η5-C5H5)V(CH3)2 results in the formation of methane and ethane.The percentage of ethane detected in the evolved gas can vary from a trace to 70percent.The percentage of ethane formed is dependent on the solvent,the concentration of (η5-C5H5)2V(CH3)2, time and temperature.The results of oxidation and reduction reactions involving (η5-C5H5)2V(CH3)2 are also presented.
- Foust, Donald F.,Rausch, Marvin D.
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p. 195 - 206
(2007/10/02)
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- OXIDATIVE-REDUCTIVE TRANSMETALLATION REACTIONS OF GERMYLMERCURY COMPOUNDS WITH BIS(ETHYLBENZENE)VANADIUM AND VANADOCENE
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The ionic complexHg>-+ has been obtained in the reaction of 2Hg with bis(ethylbenzene)vanadium.Dicyclopentadienylvanadium displaces mercury in 2Hg to give the covalent product Cp2VGe(C
- Bochkarev, M. N.,Pankratov, L. V.,Cherkasov, V. K.,Razuvaev, G. A.,Latyaeva, V. N.,Lineva, A. N.
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- Azo-complexes of Bis(cyclopentadienyl)-titanium and -vanadium; Model Systems for N-N Multiple Bond Activation
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Azobenzenebis(η5-cyclopentadienyl)-titanium and -vanadium and some titanium and vanadium analogues have been synthesized from and (cp = η5-C5H5) respectively.In the mononuclear structure of the conformation and bond data of the cis-azobenzene ligand differ considerably from those of the free molecule.The complex consists of a Ti(cp)2 moiety bridged in an edge-on fashion to the azo-group with the most significant bond data being: N-N 1.339(8), N-C 1.395(10), Ti-N 1.968(6), Ti-cp(centroid) 2.077 Angstroem, N-Ti-N 39.8(5), and cp-Ti-cp 133.0 deg.The metal-nitrogen and -azo bonding characteristics are evaluated in connection with related compounds.A quantitative ab initio molecular orbital treatment of the related model complex is consistent with the main conformational data and indicates strong interaction of the azo-group and the metal.Formation of the complex gives rise to a lowering of the N-N bond order and an increase of the titanium oxidation state.
- Fochi, Giovanni,Floriani, Carlo,Bart, Jan C. J.,Giunchi, Giovanni
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p. 1515 - 1522
(2007/10/02)
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- ? COORDINATION DE DIAZOALCANES SUR LE DICYCLOPENTADIENYLVANADIUM(II)
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Diazoalkanes R2CN2 (R2C = CHCO2Et, CH(C6H5)2, fluorenylidene) react with Cp2V; chemical and spectroscopic investigations suggest a side on coordination of the ligand in these complexes.
- Martin, J.,Moise, C.
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p. C57 - C59
(2007/10/02)
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- Isolation of complex halogeno anions as the acetylacetonatobis(cyclopentadienyl)titanium(IV) and -vanadium(IV) salts. Reactions of (π-C5H5)2TiIV and (π-C5H5)2 VIV with squarate and ethyl acetoacetate ions
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The complex allions FeCl4-, CoCl42-, ZnCl3(H2O)-, SnCl3-, CdCl42-, and SnCl62- have been precipitated from aqueous solutions of the metal chlorides in the presence of excess chloride ion by the cations (π-C5H5)2Ti(acac)+ and (π-C5H5)2V(acac)+. Conductivity measurements indicate that these compounds are all electrolytes in nitrobenzene solution. Reaction of (π-C5H5)2TiIV with the squarate ion, C4O42-, gives a compound where squarate appears to function as a simple bidentate ligand behaving much like tropolonate. Reactions of (π-C5H5)2Ti(ClO4)2 and (π-C5H5)2V(ClO4)2 with ethyl acteoacetatc give complexes of the type [(π-C5H5)2M(C6H9O 3)]ClO4, M = Ti and V. In the vanadium compound the ethyl acetoacetate ligand is chelated normally, while the titanium analog appears to involve coordination via one keto oxygen and the ether oxygen.
- Doyle, Gerald,Tobias, R. Stuart
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p. 2484 - 2488
(2008/10/08)
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