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1979[X]
1Author    Jochen Eilermann, HelmutA. LindnerRequires cookie*
 Title    Komplexchemie polyfunktioneller Liganden, 52 [1] Hydrido-und Deuterido-mangan(I)-carbonyl  
 Abstract    Komplexe des 1.1.1-Tris (diphenylphosphinomeihy 1) e thans Complex Chemistry of Polyfiinctional Ligands, 52 [1] Hydrido-and Deuterido-manganese(I)-carbonyl Complexes of 1,1,1 -Tris(diphenylphosphinomethyl)ethane 
  Reference    Z. Naturforsch. 34b, 799—804 (1979); eingegangen am 26. März 1979 
  Published    1979 
  Keywords    Deuterido-manganese(I)-carbonyl Complexes, 1, 1, 1 -Tris(diphenylphosphinomethyl)ethane, Vibrational Spectra, 31 P NMR, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0799.pdf 
 Identifier    ZNB-1979-34b-0799 
 Volume    34 
2Author    Dietmar Kuck, Hans-Friedrich GrützmacherRequires cookie*
 Title    Der Einfluß der Kettenlänge auf die massenspektrometrigche Fragmentierung höherer l.co-Diphenylalkane The Influence of the Chain Length on the Mass Spectrometric Fragmentation of Higher 1, co-Diphenylalkanes  
 Abstract    The mass spectrometric fragmentation of l,co-diphenylalkanes (2 < co < 22) has been studied in order to elucidate the effect of the chain length on the reactions of unstable and metastable molecular ions with respect to the occurrence of internally solvated ions in the gas phase. The unstable molecular ions of all l,co-diphenylalkanes react predominantly by formation of C?H7+ and C7Hg + " ions, the latter ones are also formed by metastable molecular ions. Neither the variation of the relative abundances of these fragment ions with the chain length nor the fragmentation of specifically deuterated molecular ions indicate any internal solvation in the reacting ions. Inspite of the localized activated C-H bonds at the benzylic positions, these "activated" H atoms are not involved in intra-molecular hydrogen exchange reactions or the formation of C7Hs + ' ions (with the exception of co = 3). Especially the higher homologues (co > 12) react very similarly to the molecular ions of 1-phenylalkanes, while the fragmentation of the lower homologues (co < 6) is determined by specific ("vinculoselective") competitive reactions, e.g. loss of CvH?' and CsHs. 
  Reference    Z. Naturforsch. 34b, 1750—1764 (1979); eingegangen am 12. Juli 1979 
  Published    1979 
  Keywords    Mass Spectrometry, 1, co-Diphenylalkanes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1750.pdf 
 Identifier    ZNB-1979-34b-1750 
 Volume    34 
3Author    Heinz-Peter Schuchmann, Heinz Bandmann, Clemens Von SonntagRequires cookie*
 Title    The 185 nm Photolysis of 1,4-Dioxane in the Liquid Phase  
 Abstract    The main products in the 185 nm photolysis of neat 1,4-dioxane are formaldehyde (0 = 0.25), glycol monovinyl ether (0.17), and ethylene (0.15). Some hydrogen (0.04), carbon monoxide (0.01), acetaldehyde (0.03), oxetane (0.04), and bidioxanyl (0.01) are also formed. On N20-saturation, the quantum yields of these products are diminished by about 30%, and N2 (0.59) and hydroxydioxane (0.4) become the main products. They are thought to be formed in the reaction sequence hv dioxane > • dioxane* dioxane* + N20 > • dioxane + N2 + O O + dioxane > • hydroxydioxane In aqueous dioxane, photoionisation is possible due to a greater lowering of the ionisa-tion threshold. In dioxane/water 20:80 the main products are H2 (0.50) and bidioxanyl (0.45), most likely formed in consequence of (dioxane)aq (dioxane)aq + eäq (dioxane)Jq • (dioxane-H)-+ H+ eäq + H+ > H-H-+ dioxane >-H2 + (dioxane-H)-2 (dioxane-H)- • bidioxanyl 
  Reference    Z. Naturforsch. 34b, 327—332 (1979); received October 6 1978 
  Published    1979 
  Keywords    Photolysis, 1, 4-Dioxane, Photoionisation, Energy Transfer, Quantum Yields 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0327.pdf 
 Identifier    ZNB-1979-34b-0327 
 Volume    34 
4Author    Reiner Luckenbach, Nikolaus MüllerRequires cookie*
 Title    Zur elektrocyclischen Ringöffnung von Cyclopropylhalogeniden bei der Reaktion mit Natriumiodid in Aceton Electrocyclic Ring Opening of Cyclopropyl Halides in the Course of their Reaction with Sodium Iodide in Acetone  
 Abstract    Reaction of cyclopropyl halides with sodium iodide in acetone [i.e. under typical Sis-2-conditions), proceeds via ring opening to allylic systems finally yielding 1,5-hexadienes upon dimerisation; ring-retained products were not detected. Application of the Wood-ward-Hoffmann rules lends strong support to a cationic synchronous mechanism. This is also confirmed by kinetic measurements proving this reaction to be first order over all. The kinetic data are shown to fit the Hammett equation using cr-values for cyclopropyl bromides and o + -values for geminal cyclopropyl dichlorides, respectively. The validity of the Woodward-Hoffmann-De Puyrule (according to which in synchronous reactions leaving groups situated endo are strongly favored over those situated exo) is tested in corresponding experiments involving condensed ring systems. I. Zum Problem der nukleophilen Substitution an Cyclopropylsystemen In der vorliegenden Arbeit werden die Reaktionen von 2-phenylsubstituierten Cyclopropylhalogeniden unter typischen SN2-Bedingungen (Umsetzung mit Natriumiodid in Aceton) untersucht. Zunächst 
  Reference    Z. Naturforsch. 34b, 464—480 (1979); eingegangen am 10. August/19. Dezember 1978 
  Published    1979 
  Keywords    Ring Opening, Woodward-Hoffmann Rules, Allylic Cations, Dimerisation, 1, 5-Hexadienes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0464.pdf 
 Identifier    ZNB-1979-34b-0464 
 Volume    34 
5Author    UlrichW. GerwarthRequires cookie*
 Title    Borverbindungen, 12. Mitteilung Das Kristallisationsverhalten der Poly(2-phenyl-1.3.2-dioxabora-cycloalkane) Boron Compounds, Part 12 The Crystallizing Behaviour of Poly(2-phenyl-l,3,2-dioxybora-cycloalkanes)  
  Reference    Z. Naturforsch. 34b, 1084—1091 (1979); eingegangen am 4. April 1979 
  Published    1979 
  Keywords    1, 3, 2-Dioxybora-cycloalkanes, Ligand Exchange, Metathetic Rearrangement, Cyclic Oligomers, Thermal Analysis 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1084.pdf 
 Identifier    ZNB-1979-34b-1084 
 Volume    34