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1990 (1)
1987 (1)
1983 (2)
1Author    KarlE. Schwarzhans, Herwig SchottenbergerRequires cookie*
 Title    Ferrocenylen-cobaltocenylenium  
 Abstract    hexafluorophosphat [(h 5 :h 5 '-C10H8)2FeCo] [PF6], ein gemischtkerniger Komplex vom Bis(fulvalen)dimetall-Typus Ferrocenylenecobaltocenyleniumhexafluorophosphate [(h 5 : h 5 '-CioH8)2FeCo][PF6], Ferrocenylenecobaltocenylenium-monochloride and ferrocenylenecobaltocenylenium-hexafluorophosphate were prepared under the aspect of influencing the valence averaging phenomena described for homodinuclear metallofulvalenes. Detected paramagnetism of the monocation is assumed to result from such interactions in dibridged rigid metallocenes. The above cation is characterized by IR, CV, MS, electron microprobe and elemental analyses. 
  Reference    Z. Naturforsch. 38b, 1493—1496 (1983); eingegangen am 28. Juni 1983 
  Published    1983 
  Keywords    Ferrocenylenecobaltocenylenium-monochloride, IR Spectra, MS Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1493.pdf 
 Identifier    ZNB-1983-38b-1493 
 Volume    38 
2Author    Hansjörg Grützm, H. Erbert, W. Roesky, Mathias Noltem, GeorgeM. SheldrickRequires cookie*
 Title    Substitutionsreaktionen am N-[l-Chlor-2,2,2-trifluor-l-(trifluormethyl)ethyl]-dimethyIformamidin Substitution Reactions with N -[l-Chloro-2,2,2-trifluoro-l-(trifluorom ethyl)ethyl]-dim ethylform am idine  
 Abstract    It is difficult to achieve nucleophilic attack on a carbon atom bonded on two trifluoromethyl groups. However, N-[l-chloro-2,2,2-trifluoro-l-(trifluoromethyl)ethyl]-dimethylformamidine (1) reacts readily with H20 , MeOH, EtSH and P(OM e)3 even under mild conditions to form products 2, 3, 4 and 5. The reaction between 1 and Ph2PH is complex but leads in nearly quantitative yield to N-[2,2,2-trifluoro-l-(trifluoromethyl)ethyl]-dimethylformamidinium chloride 6 which has been characterized by an X-ray structure analysis. A reaction mechanism is proposed. 
  Reference    Z. Naturforsch. 42b, 1245—1248 (1987); eingegangen am 5. Mai/27. Juni 1987 
  Published    1987 
  Keywords    MS Spectra, Fluoroorganic Compounds, NMR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1245.pdf 
 Identifier    ZNB-1987-42b-1245 
 Volume    42 
3Author    Hansjörg GrützmRequires cookie*
 Title    Spaltung der Ylid-Bindung in Phosphor-Yliden: Photolyse von thiophosphoranylsubstituierten (Triphenylphosphoranyliden)methanen Cleavage of Ylidic Bonds in Phosphorus Ylides: Photolysis of Thiophosphoranyl-Substituted (Triphenylphosphoranylidene)methanes  
 Abstract    The thiophosphoranyl-substituted (triphenylphosphoranylidene)methanes 1, 6 a, b are cleaved photolytically (/ > 300 nm, 3 d, 0 °C) to yield triphenylphosphane and the thio-aza-phosphetanes 3 and 8 a, b, b', respectively. The formation of these heterocycles is explained in­ voking insertion o f the carbenes 2 and 7 a, b into the methine CH bond of one of the isopropyl groups. If 6a is irradiated for 16 h in the presence of the phosphanes P(NM e2)3, P(OMe)3 or P("Bu)3, the new ylides 9 a, b, c are obtained along with small quantities of 8 a. These results indicate a cleavage of the ylidic bond in 1 and 6a, b. The failure of attempted cyclopropana-tion reactions of olefins as well as the absence of the expected product o f a 1,2-H shift, 10, in the case of the photolysis of 6b leave doubts as to the occurrence of free carbenes. 
  Reference    Z. Naturforsch. 45b, 170—174 (1990); eingegangen am 26. Mai/23. August 1989 
  Published    1990 
  Keywords    Phosphorus Ylides, Photolysis, N M R Spectra, MS Spectra 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0170.pdf 
 Identifier    ZNB-1990-45b-0170 
 Volume    45 
4Author    Jürgen Schallenberg, Eckart MeyerRequires cookie*
 Title    Simple Syntheses of 3-Substituted Indoles and their Application for High Yield 14 C-Labelling  
 Abstract    Methods are described which allow the synthesis of several plant indole alkaloids and their metabolites at different scales. Compounds synthesized include gramine (1) (3-di-methylaminomethylindole) which is directly derived from indole, while its biosynthetic precursors 3-aminomethylindole (3) and 3-methylaminomethylindole (2) as well as indole-3-carboxylic acid (7) are synthesized via indole-3-aldehyde (6). Slight changes of the experimental conditions allow syntheses with high yields not only at the molar but also at the /imolar level. This is extremely useful when isotope labelled compounds of high specific radioactivity are required for studies of plant metabolism. 
  Reference    (Z. Naturforsch. 38b, 108—112 [1983]; received July 22 1982) 
  Published    1983 
  Keywords    3-Substituted Indoles, Indole Alkaloids, UV Spectra, MS Spectra, 1 H NMR spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0108.pdf 
 Identifier    ZNB-1983-38b-0108 
 Volume    38