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  • General Chemistry  (106)
  • 2010-2014
  • 2000-2004
  • 1995-1999  (99)
  • 1955-1959
  • 1950-1954  (7)
  • 1997  (99)
  • 1950  (7)
Collection
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  • 2010-2014
  • 2000-2004
  • 1995-1999  (99)
  • 1955-1959
  • 1950-1954  (7)
Year
  • 1
    Electronic Resource
    Electronic Resource
    [(TptBu, Me)CrR]: A New Class of Mononuclear, Coordinatively Unsaturated Chromium(II) Alkyls with cis-Divacant Octahedral Structure (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1668-1674 
    Details
    ISSN: 0947-6539
    Keywords: alkenes ; chromium ; cis-divacant octahedral geometry ; polymerizations ; tris(pyrazolyl)borate complexes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of CrCl2 with TptBu, MeK yielded [TptBu, MeCr(3-tBu, 5-MepzH)Cl] (1) and [TptBu, MeCrCl] (2), while the same reaction in the presence of pyridine gave 1 and [TptBu, MeCr(py)Cl] (3). Alkylation of 3 with Grignard reagents produced the chromium(II) alkyls [TptBu, MeCrR] (4, R = Et; 5, R = Ph; 6, R = CH2SiMe3), which reversibly added to pyridine to form the five-coordinate adducts [TptBu, MeCr(py)R] (7, R = Et; 8, R = Ph; 9, R = CH2SiMe3). 1, 2, 4, and 5 were structurally characterized by X-ray diffraction. The four-coordinate molecules 2, 4, and 5 adopt a highly unusual cis-divacant octahedral coordination geometry, while 1 is the first five-coordinate TptBu, Me-complex of a first-row transition metal. Despite their coordinative unsaturation, chromium alkyls 4-6 do not polymerize ethylene, or even react with it. This observation is inconsistent with the catalytic activity commonly ascribed to divalent chromium in heterogeneous polymerization catalysts. Attempts to oxidize 4-6 (e.g., with [Cp2Fe]BPh4) to cationic chromium(II) alkyls failed, yielding [TptBu, MeCr(thf)][BPh4] (10) instead.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970031016
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  • 2
    Electronic Resource
    Electronic Resource
    Die Einführung von Sulfo-Gruppen in Alkane mittels Schwefeldioxyd und Sauerstoff (Sulfoxydation)Vortrag anläßlich der Tagung der GDCh in München am 23. Sept. 1949, vgl. diese Ztschr. 61, 450 [1949]. (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 302-305 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zur „Sulfoxydation“ organischer Verbindungen - insbes. von Paraffinen - wurden das „Licht-Wasser-Verfahren“ und das „Essigsäureanhydrid-Verfahren“ zu technisch brauchbaren, kontinuierlichen Arbeitsmethoden entwickelt. Ihr Reaktionsablauf konnte aufgeklärt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500621303
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  • 3
    Electronic Resource
    Electronic Resource
    Die Verbrennung der Fettsäuren im tierischen Organismus (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 66-72 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die verschiedcnen möglichen Wege des Fettsäurenabbaues, β-,α- und α,γ-Oxydation, 9,10-Dehydrierung, der Abbau durch Lipoxydasen, die ω-sowie die alternierende β-Oxydation und die Abbauwege der mittleren und höheren Fettsäuren werden dargestellt. Aus dem Tricarboxylsäurecyclus und dem Zusammenwirken von Zucker- und Fettverbrennung ergibt sich die Gesamtbilanz des Fettsäurestoffwechsels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500620303
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  • 4
    Electronic Resource
    Electronic Resource
    Zum mikrochemischen Nachweis von Aldehyden und Ketonen (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 144-145 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500620604
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  • 5
    Electronic Resource
    Electronic Resource
    Vorstellungen zur oxydativen Entalkylierung von tertiären Aminen und Äthern (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 359-361 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird gezeigt, daß man zu einem guten Verständnis der oxydativen Entalkylierung gelangt, wenn man den primären Angriff der Oxydationsmittel an die Heteroatome verlegt. Man erhält dann Zwischenverbindungen mit einem Elektronenseptett, die eine Schlüsselstellung für alle Folgereaktionen einnehmen. Formal nehmen diese Radikalsalze eine Übergangsstellung analog den Ketylen ein. Es ist außerordentlich, daß Autoxydations- und Substitutionsvorgänge ebenfalls im Sinne einer Kettenreaktion über Durchgangsradikale verlaufen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500621503
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  • 6
    Electronic Resource
    Electronic Resource
    Chemisches Kolloquium der Universität Mainz (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 370-370 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500621513
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  • 7
    Electronic Resource
    Electronic Resource
    GDCh-Ortsverband Berlin (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 418-418 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500621718
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  • 8
    Electronic Resource
    Electronic Resource
    TU Berlin. 12. Kolloquium für Elektrochemie und Korrosionforschung (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 418-418 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500621717
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  • 9
    Electronic Resource
    Electronic Resource
    Nickel Complexes of 21-Oxaporphyrin and 21, 23-Dioxaporphyrin (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 268-278 
    Details
    ISSN: 0947-6539
    Keywords: heterocycles ; heteroporphyrins ; nickel ; porphyrinoids ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nickel(I) and nickel(II) complexes of 5,20-bis(p-tolyl)-10, 15-diphenyl-21-oxaporphyrin (ODTDPPH) and 5,10,15,20-tetraphenyl-21, 23-dioxaporphyrin (O2TPP) have been investigated. These oxa analogues of 5,10,15,20-tetraarylporphyrin, where one or two pyrrole rings are replaced by a furan moiety, have been synthesized by condensation of the respective precursors, namely 2,5-bis(arylhydroxymethyl)furan, pyrrole, and arylaldehyde. Insertion of nickel(II) into ODTDPPH or O2TPP yielded high-spin five- and six-coordinate ([(ODTDPP)NiIICl] and [(O2TPP)NiIICl2]) complexes, which can be reduced with moderate reducing reagents. The EPR spectra of [(ODTDPP)NiI] and [(O2TPP)NiICl] revealed the NiI oxa(dioxa)porphyrin rather than a NiI anion radical electronic structure. In the structures of [(ODTDPP)NiIICl], [(O2TPP)NiIICl2], and [(ODTDPP)NiI], determined by X-ray diffraction, the furan ring is planar and coordinates in the η1 fashion through the trigonal oxygen atom; the nickel ion lies in the furan plane for the latter two complexes, but slightly outside it in [(ODTDPP)NiIICl]. The Ni-N and Ni-O bond lengths decrease upon reduction of high-spin five-coordinate [(ODTDPP)NiIICl] to four-coordinate [(ODTDPP)NiI]. The pattern of downfield pyrrole resonances in 1H NMR spectra of [(ODTDPP)NiIICl] and [(O2TPP)-NiIICl2] has been established. The downfield positions of furan resonances are unusual for NiII heteroporphyrins; they have been accounted for by the nearly in-plane coordination of the furan moiety as opposed to the side-on coordination found for thiophene- or selenophene-containing heteroporphyrins. An example of ion-pair formation, [(O2TPPH)2][NiIICl4], was produced from [(O2TPP)NiIICl2] by acidification with HCl.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030216
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  • 10
    Electronic Resource
    Electronic Resource
    A Joint Experimental and Theoretical Study of the Interaction between Aluminum and Electroluminescent Polymers: Cyano Derivatives of Poly(p-phenylene vinylene) (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 286-293 
    Details
    ISSN: 0947-6539
    Keywords: light-emitting diodes ; polymers ; semiempirical calculations ; electroluminescence ; polymer/metal interface ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The early stages of metal/polymer interface formation between aluminum and poly(2,5,2′,5′-tetrahexyloxy-8,7′-dicyanodi-p-phenylenevinylene) or their ring-substituted derivatives have been studied theoretically by using quantum-chemical calculations as well as experimentally by X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. This class of conjugated polymer is of interest in the development of organic light-emitting diodes. The theoretical and experimental results indicate that aluminum preferentially reacts with the polymer by forming covalent bonds with the nitrogen and carbon atoms of the cyano groups. When the side chains of the phenylene rings include carbonyl groups, however, the theoretical results indicate that the carbonyl moiety is another preferred site of interaction.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030218
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