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  • 1990-1994  (2)
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  • 1960-1964  (3)
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  • 1994  (2)
  • 1963  (3)
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  • Titanium
  • 1
    Electronic Resource
    Electronic Resource
    Adsorption voltammetry of the titanium-4-[(4-diethylamino-2-hydroxyphenyl)-azo]-5-hydroxynaphthalene-2,7-disulfonic acid (beryllon III)system (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 293-297 
    Details
    ISSN: 1040-0397
    Keywords: Adsorption voltammetry ; Titanium ; Stripping analysis ; Human hair ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The behavior of Ti (IV) complex with Beryllon III, Ti (IV) A, at a mercury electrode has been investigated in acetate buffer (HOAc/NaOAc). The adsorption phenomena were observed by linear-sweep voltammetry. The mechanism of the electrode reaction was found to be the irreversible reduction of Beryllon III in the complex adsorbed on the surface of the electrode. In 0.005 mol/LHOAc + 0.1 mol/L NaOAc and 5 × 10-10 to 1 × 10-7 mol/L, the detection limit of the method is 2.5 × 10-10 mol/L for a preconcentration time of 120 seconds. This method has been applied to samples of human hair.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060405
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Eine neue Hochtemperaturform von TiO: H—TiOProfessor Wilhelm Preetz zum 60. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1175-1178 
    Details
    ISSN: 0044-2313
    Keywords: Titanium ; oxygen ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New High Temperature Form of TiO: H—TiOSingle crystals of a high temperature form of TiO (H—TiO) were prepared above 3 000°C by CO2-LASER technique. They crystallize with a hitherto unobserved crystal structure of oxides with titanium in the oxidation state two, isotypic to tungsten carbide with Ti2+ in a trigonal prismatic surrounding by oxygen. Space group D3h1-P6m2, a = 3.0310, c = 3.2377 Å, Z = 1.
    Notes: Mit CO2-LASER-Technik wurden bei Temperaturen oberhalb 3 000°C Einkristalle einer Hochtemperaturform von TiO (H—TiO) dargestellt. Sie kristallisieren mit einer an Oxiden des zweiwertigen Titans bisher nicht beobachteten Kristallstruktur, isotyp zu Wolframcarbid, mit Ti2+ in trigonal prismatischer Sauerstoffumgebung. Raumgruppe D3h1—P6m2; a = 3,0310; c = 3,2377 Å; Z = 1.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200708
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  • 3
    Electronic Resource
    Electronic Resource
    Low-Temperature Polymerization of EthylenePublished on the occasion of the 100th anniversary of the founding of Farbwerke Hoechst on January 11th, 1963 (1963)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 2 (1963), S. 32-41 
    Details
    ISSN: 0570-0833
    Keywords: Polymerization ; Polyethylene ; Titanium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A two-component organometallic catalyst of composition CH3TiCl3·CH3AlCl2 effects high-speed polymerization of ethylene in the presence of chlorinated hydrocarbons at low temperatures. The catalyst does not undergo any alteration in the process. In contrast to the Ziegler catalysts, the titanium remains quadrivalent. Olefins of low-molecular-weight and with branched structures are produced. It proved possible to isolate the primary products of the polymerization at -50 to -100°C and to elucidate the mode of their formation from a knowledge of their structures. The findings are incompatible with either a cationic or anionic reaction mechanism. A novel type of mechanism is proposed, whereby the catalyst is supposed to have an ionic structure and molecular growth proceeds via π-complex formation of the olefin with the titanium cation. The formation of ethylene/olefin copolymers is also discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196300321
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclooligomerization of Butadiene and Transition Metal π-Complexes (1963)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 2 (1963), S. 105-115 
    Details
    ISSN: 0570-0833
    Keywords: Cyclooligomerization ; Butadiene ; Titanium ; Cyclododecatriene ; Cyclooctadiene ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Advances in the fields of synthesis and reactions of some medium-sized hydrocarbon rings are reported and in connection therewith on novel π-complexes of transition metals. Catalytic syntheses yield 1,5,9-cyclododecatriene, 1,5-cyclooctadiene, and 1,5-cyclodecadiene either from butadiene or from butadiene and ethylene. The reactions proceed very readily.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196301051
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  • 5
    Electronic Resource
    Electronic Resource
    Reactions of Olefins with the Titanium-Carbon BondDedicated to Prof. Dr. Karl Ziegler on the occasion of his 65th birthday (1963)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 2 (1963), S. 704-714 
    Details
    ISSN: 0570-0833
    Keywords: Titanium ; Alkenes ; Polymerization ; Titanium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: At low temperatures, ethylene and α-olefins (Δ1-olefins or 1-alkenes) are rapidly converted into oligomrs by the two-component organometallic catalyst CH3TiCl3·CH3AlCl2. To achieve smooth oligomerizations, aromatic or chlorinated hydrocarbons must be used as solvents. Although the activity of the titanium-carbon bond is enhanced by the aluminum component of the catalyst, the aluminum and its methyl group do not participate in the reaction proper; the latter proceeds exclusively at the titanium-carbon bond. The reaction will olefins can be used as an analytical method for the quantitative determination of the titanium-carbon bond in admixture with the organoaluminum component. It is thus possible to follow the reaction leading to formation of the catalyst from titanium tertrachloride, as well as the processes occurring at the titanium-carbon bond during the oligomerization of olefins. All the observations indicate that the catalyst possesses an ionic structure which is determined by the solvent. It is shown that the initial reaction step probably involves formation of a complex between the olefin and the alkyltitanium cation. The reaction scheme proposed is based on organometallic reactions which are characterized by carbanion and hydride transfers within the olefin-cation complex. This mechanism, which is unusual for Ziegler catalysts, is due to the predominance of hydride transfers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196307041
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