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  • Organic Chemistry  (12)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 82-84 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 2
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The partially diethylamino substituted phenyl-chloromono- and -disilanes Cl2Ph(NEt2)Si(2) Cl2Ph(NEt2)2Si(3), [ClPh(NEt2)Si-]2 (7) and Cl(NEt2)PhSi—SiPh(NEt2)2 (8) were synthesized. 3 and 8 are able to react with lithium powder to form the corresponding silyllithium compounds. The resulting species were characterized in solution by 13C and 29Si NMR spectroscopy. To prove the expected substitution patterns of the silyllithium compounds some coupling reactions with chlorosilanes were carried out and the resulting new oligosilanes were characterized by means of NMR spectroscopy and MS.
    Additional Material: 3 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 603-606 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and Characterization of Oligomeric as well as Polymeric Ethynylsilanes Containing Si2—Si4 UnitsThe treatment of methylchlorodisilanes with ethynyldigrignard (BrMgC≡CMgBr) resulted in oligomeric as well as polymeric ethynyldisilanes. The kind of this products is related to the chloro functionality of the starting disilane. The reaction of SiClMe(SiCl2Me)2 as well as SiMe(SiCl2Me)3 yielded polymers beside small amounts of the monomeric products (HC≡C)MeSi[SiMe(C≡CH)2]2 and MeSi[SiMe(C≡CH)2]3.
    Additional Material: 5 Tab.
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  • 4
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 675-681 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Chlormethylierung von schwach vernetztem Polystyrol gelingt die Ankettung von Hydrazid- und Verdazylgruppierungen. Die Polymeren werden dadurch koordinationsaktiv gegenüber Cu2+-Ionen. Eine Fixierung der Cu(II)-Verbindungen an den Polymeren wird ESR-spektroskopisch bewiesen.Polymere Verdazyle aus 1,3,5-Triphenylformazan und chlormethyliertem Polystyrol können Cu(II)-Salze reduzieren. Ihre Reaktivität wird vom Lösungsmittel (Äthanol 〉 Acetonitril 〉 Dimethylformamid 〉 Dimethylsulfoxid) und vom Anion (Cl- 〉 SO42-, NO3-) beeinflußt.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 75-85 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fe(III)-Complexes with Mixed Ligands Consisting of Oxalate and Phenolate LigandsThe formation of mixed-ligand complexes between iron(III) ion, potassium oxalate and potassium salts of salicylic acid, sulfosalicylic acid, catechol, sodium 3,5-sulfocatechol („tiron“) and tetrachlorocatechol, respectively, has been investigated. There were obtained solid products with the approximate composition K3[Fe(C2O4)3-xLx] · n H2O (L = phenolat; x = 1; 2). For the synthesis of the above compounds ligand exchange reactions as well as addition-technique of oxalic acid followed by potassium phenolat to Fe2O3 · aq has been used. Through spectroscopic examination of the obtained products was found, that Fe3+-ion is simultaneously coordinated by oxalat and phenolat. Probably the products consist of at least two components as Fe(III) was found in two different bond states.
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 360-366 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Constitution and Redox Stability of Copper(II)-Complexes with Substituted HydrazinesCuCl2 reacts with substituted hydrazines forming chelates of the CuIIL2Cl2 type (L = RCONHNH2, RCONHN(C6H5)2, RCONHNHCOR, H2NNHCO(CH2)nCONHNH2) which are characterized by quantitative analysis, i.r. and e.p.r. spectra. The complex polyhedron exhibits the geometry of a tetragonally distorted octahedron of C2v symmetry. The complexes undergo intramolecular redox decomposition in acetonitril forming Cu(I) species.The rate constants increase with decreasing half wave oxydation potential and decreasing Homo energy of the hydrazine ligands, respectively.
    Additional Material: 4 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 123-132 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fixation of Cupric Ions in Matrices from Polyamide- and Polyhydrazide AcidsOn polymerisation of pyromellitic dianhydride with 4,4′-diamino-diphenyl ether and the dihydrazides of oxalic acid, malonic acid, adipic acid and terephthalic acid, respectively, filmforming polyamide-hydrazide-acids result. It is possible to control the reducing and mechanical properties of the polymers by variation of the mole ratio of 4,4′-diamino-diphenyl ether and acid hydrazide. Polymers with 0.3 moles of acid hydrazide and 0.7 moles of 4,4′-diamino-diphenyl ether do not reduce cupric ions, but co-ordinate them. EPR and absorption spectra show the cupric ions to co-ordinate with the hydrazide but not with the amide groups if the stoichiometric ratio polymer/Cu(II) is greater then 12. Only in foils prepared with the hydrazide of terephthalic acid the co-existence of Cu(II) complexes of the amide and hydrazide groups, respectively, is observed. Both these complex polyeders exhibit axial geometry.
    Notes: Bei der Polymerisation von Pyromellitsäureanhydrid mit 4,4′-Diaminodiphenyläther und den Dihydraziden von Oxalsäure, Malonsäure, Adipinsäure oder Terephthalsäure entstehen koordinationsaktive filmbildende Polyamidhydrazidsäuren. Das Reduktionsvermögen gegenüber Cu2+-Ionen und die mechanischen Eigenschaften der Polymeren lassen sich durch die Variation des Konzentrationsverhältnisses von 4,4′-Diaminodiphenyläther und Säurehydrazid steuern. Polymere mit 0,3 Mol Säurehydrazid und 0,7 Mol 4,4′-Diaminodiphenyläther pro Mol Pyromellitsäureanhydrid sind bei Zimmertemperatur gegenüber Cu2+-Ionen redoxstabil und fixieren diese unter Komplexbildung. Die Auswertung der ESR- und Absorptionsspektren der Cu(II)-haltigen Polymermatrizen zeigt, daß bei Stöchiometrieverhältnissen Polymer: Cu(II) ≥ 12 die Cu2+-Ionen generell von der Hydrazidsäure- und nicht von der Amidsäuregruppierung komplexiert werden. Lediglich in den Folien mit Terephthalsäuredihydrazid liegen Cu(II)-Amidsäure- und Cu(II)-Hydrazidsäure-Komplexpolyeder nebeneinander vor. Sie besitzen jeweils eine axiale Geometrie.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 1031-1035 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electron Spin Resonance Studies of the Photolysis of σ-Methyl-cobalt-ComplexesThe anaerobic photolysis with visible light of the complexes [CH3CoIII(salen)Y] and [CH3CoIII(salphen)Y] in the solvents chloroform, methanol, isopropanol and dimethylformamide proceeds by a mechanism involving a homolytic cleavage of the Co—C bond. Resulting low spin complexes were identified by EPR spectra. They react with oxygen in dimethylformamide forming the superoxid cobalt complexes \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm YCo}^{{\rm III}} \left({{\rm salen}} \right){\rm O}_{\rm 2} }^{\scriptstyle {{\relbar}\kern-3pt {.} }} \right] $\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm YCo}^{{\rm III}} \left({{\rm salphen}} \right){\rm O}_{\rm 2} }^{\scriptstyle {{\relbar}\kern-3pt {.} }} \right] $\end{document} respectively. The methyl radicals were detected using the technique of spin trapping with nitroso-tert.-butane. In the aerobic photolysis of the methyl-Co(III) complexes CH3· as well as CH3O· radicals could be trapped.
    Notes: Die anaerobe Photolyse der Komplexe [CH3CoIII(salen)Y] und [CH3CoIII(salphen)Y] mit sichtbarem Licht in den Lösungsmitteln Chloroform, Isopropanol, Methanol und DMF verläuft unter homolytischer Spaltung der Co—C-Bindung. Die resultierenden low spin Co(II)-Komplexe sind direkt ESR-spektroskopisch identifizierbar. Sie reagieren in DMF mit Sauerstoff unter Bildung von Superoxidkomplexen [\documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm YCo}^{{\rm III}} \left({{\rm salen}} \right){\rm O}_{\rm 2} }^{\scriptstyle {{\relbar}\kern-3pt {.} }} \right] $\end{document}] bzw. \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm YCo}^{{\rm III}} \left({{\rm salphen}} \right){\rm O}_{\rm 2} }^{\scriptstyle {{\relbar}\kern-3pt {.} }} \right] $\end{document}. Das Methyl-radikal kann mit tert.-Nitrosobutan abgefangen werden. Bei der aeroben Photolyse der Methyl-Co(III)-Komplexe sind sowohl das Methyl- als auch das Methoxyradikal nachweisbar.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 566-572 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Identification of Intermediates in the Photolysis of Some σ-Alkyl Cobalt Complexes using the Technique of Spin TrappingIn the aerobic photolysis of the complexes [R1Co(chel)Y] (R1 = CH3, C2H5, n-C3H7; chel = salen, salphen; Y = H2O, C5H5N, P(C6H5)3) and [R22Co(bipy)2]X (R2 = CH3, n-C3H7, C6H5CH2; X = ClO4, J) in chloroform alkyl-, alkoxy and hydroxyalkyl radicals are detected using the technique of spin trapping. Moreover, in the presence of phenyl tert.-butyl nitrone the photolysis of the ethyl and propyl complexes [RCo(chel)Y] produces the spin adduct of H at phenyl tert.-butylnitrone. From these results we conclude that photochemically the hydridocomplexes [HCo(chel)Y] are formed.
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