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  • 1
    Electronic Resource
    Electronic Resource
    Tetramethyl(2-methylthioethyl)cyclopentadienyl complexes of zirconium(iv): synthesis, crystal structure, and dynamic behavior in solutions (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 940-949 
    Details
    ISSN: 1573-9171
    Keywords: substituted sulfur-containing cyclopentadienes ; cyclopentadienyl zirconium complexes ; dynamic behavior ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Chelating sulfur-containing cyclopentadienyl ligand tetramethyl(2-methylthioethyl)cyclopentadiene (1), was synthesized for the first time. Its sodium (2a) and lithium (2b) derivatives were isolated in the crystalline state. Starting from compound1 some novel ZrIV complexes were prepared: [tetramethyl(2-methylthioethyl)cyclopentadienylltriclllorozirconium (3), bis[tetramethyl(2-methylthioethyl)cyclopentadienylldichlorozirconium (4), and [pentamethylcyclopentadienyll [tetramethyl(2-methylthioethyl)cyclopentadienylldichlorozirconium (5). The crystal structures of3 and5 were determined by X-ray diffraction analysis. The dynamic behavior of complex3 in various solvents was investigated by1H and13C N MR spectroscopy. The S→Zr coordination bond was shown to exist in complex3 both in the crystalline state and in solution. No coordination of this type was found in compounds4 and5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431329
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  • 2
    Electronic Resource
    Electronic Resource
    Tetramethyl(2-methoxyethyl)cyclopentadienyl complexes of zirconium(iv). Crystal structure of [η5:η1−C5(CH3)4(CH2CH2OCH3)]ZrCl3 (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1740-1744 
    Details
    ISSN: 1573-9171
    Keywords: cyclopentadienes with oxygen-containing substituents ; cyclopentadienyl zirconium complexes ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Several novel zirconium(iv) complexes with the chelating oxygen-containing cyclopentadienyl ligand, tetramethyl(2-methoxyethyl)cyclopentadiene, have been synthesized. [η5:η1-Tetra-methyl(2-methyl)cyclopentadienyl]trichlorozirconium (2), bis[η5-tetramethyl(2-methoxyethyl)cyclopentadienyl]dichlorozirconium (3), [η5-pentamethylcyclopentadienyl][η5-tetra-methyl(2-methoxyethyl)cyclopentadienyl]dichlorozirconium (4), and [η5-tetra-methyl(2-methylthioethyl)cyclopentadienyl][η5-tetramethyl(2-methoxyethyl)-cyclopentadienyl]dichlorozirconium (5) have been prepared from the corresponding lithium cyclopentadienide (l). The crystal structure of cyclopentadienyl complex2 has been established by X-ray analysis. The coordination O→Zr bond in compound2 exists both in the crystalline state and in solutions. No coordination of this type was observed in complexes3–5. Synthesized complexes2–5 are discussed in comparison with their sulfur-containing analogs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431817
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  • 3
    Electronic Resource
    Electronic Resource
    Trimethylsilylation and methylation of 1-hydroxybenzotriazole 3-oxide (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 2190-2192 
    Details
    ISSN: 1573-9171
    Keywords: 1-hydroxybenzotriazole 3-oxide ; 1-methoxybenzotriazole 3-oxide ; trimethylsilyl derivative of 1-hydroxybenzotriazole 3-oxide ; silylation ; methylation ; 1,5-O,O-migration of the SiMe3 group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Trimethylsilylation and methylation of 1 -hydroxybenzotriazole 3-oxide (1) proceed regioselectively and afford 1-trimethylsilyloxy- and 1-methoxybenzotriazole 3-oxides, respectively. The first compound easily undergoes fast hydrolysis and methanolysis, but does not react with nitroethane at 20 °C. A fast reversible 1,5-O,O-migration of the SiMe3 group is observed for this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696731
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