| | 1 | Author
| Jochen Eilermann, HelmutA. Lindner | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-0799.pdf | | | | Identifier
| ZNB-1979-34b-0799 | | | | Volume
| 34 | |
| 2 | Author
| Dietmar Kuck, Hans-Friedrich Grützmacher | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-1750.pdf | | | | Identifier
| ZNB-1979-34b-1750 | | | | Volume
| 34 | |
| 3 | Author
| Heinz-Peter Schuchmann, Heinz Bandmann, Clemens Von Sonntag | Requires 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 | |
| 4 | Author
| Reiner Luckenbach, Nikolaus Müller | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-0464.pdf | | | | Identifier
| ZNB-1979-34b-0464 | | | | Volume
| 34 | |
| 5 | Author
| UlrichW. Gerwarth | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-1084.pdf | | | | Identifier
| ZNB-1979-34b-1084 | | | | Volume
| 34 | |
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