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  • Organic Chemistry  (148)
  • Wiley-Blackwell  (148)
  • American Institute of Physics
  • 1975-1979  (121)
  • 1940-1944  (27)
  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Sulfochlorierung von Paraffinen. V. Kinetische Untersuchungen über die Sulfochlorierung definierter Alkansulfochloride (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 279-292 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on Sulphochlorination of Paraffins. V. Kinetic Studies on the Sulphochlorination of Pure AlkanesulphochloridesThe mixtures of disulphochlorides formed by sulphochlorination of 1-alkanesulphochlorides C4—C9 may be analyzed gaschromatographically after transformation into the corresponding dimethylamides. The individual peaks could be identified in some cases with the aid of pure isomeric disulphochlorides, in other cases they were identified by analogy. The mixtures formed by sulphochlorination of the isomeric heptane sulphochlorides also could be analyzed after transformation into the dimethylamides; the identification of all peaks was possible by comparison of the mixtures obtained from different heptane sulphochlorides.For the alkane sulphochlorides studied the relative rates of sulphochlorination (with reference to n-octane) were determined, and therefore the relative reaction rates of the individual C—H-bonds with reference to one primary C—H-bond of n-octane could be calculated.The results show a geminal or vicinal disubstitution not to take place in noticeable amount. In position 3 or in greater distance the influence of the sulphochloride group on the reactivity of the C—H-bonds is not significant.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210214
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  • 2
    Electronic Resource
    Electronic Resource
    1H- und 13C-NMR-spektroskopische Messungen und MO-Berechnungen zur π-Elektronenstruktur von p,p′-disubstituierten trans-Stilbenen und substituierten trans-β-Styryl-methyl-sulfonen (1978)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 922-932 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H and 13C n.m.r. Spectroscopical Measurements and HMO-π-Calculations to the π-Electronic Structure of p,p′-Disubstituted trans-Stilbenes and Substituted trans-β-Styryl-methyl-SulfonesThe 1H and 13C n.m.r. spectra have been measured for a series of donator-acceptor-disubstituted trans-stilbenes 1 and monosubstituted β-styryl-methyl-sulfones 2. The 13C n.m.r.-signals have been identified by comparison with empirical calculated chemical shifts and quantum chemical determined HMO-π-electrons densities. The influence of substitutents to the experimental chemical shifts are discussed in detail. For 1 and 2 exist linear correlations between chemical shifts and HAMMETT values, and π-electron densities, respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19783200605
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  • 3
    Electronic Resource
    Electronic Resource
    Steroide. LIII. 1H-NMR-Untersuchungen. Konfigurationszuordnung von 16-substituierten 17-Hydroxy-Steroiden (1977)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 419-431 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Steroids. LIII. 1H N.M.R.-Investigations. Configurational Assignment of 16-Substituted 17-Hydroxy SteroidsThe 1H n.m.r. spectra of epimeric 16-substituted 17β-hydroxy-3-methoxy-estra-1,3,5(10)-trienes can be used for configurational assignment. The values of the coupling constants J16,17 allow the elucidation of the configuration, when all of the four epimeric compounds with the same 16-substituent are available. When only one compound is available, a reliable configurational assignment by J16,17 is only possible, when J ≤ 2 cps (16β,17α-configuration of the substituents) or when J 〉 8 cps (16β,17β-configuration). Further parameters for configurational assignment are the chemical shifts of the 13β-methyl protons and the 17-proton, the downfield shifts of the 17-proton signals, caused by acetylation or by “in situ” reaction with trichloroacetyl isocyanate, and the chemical shift as well as the sum of the coupling constants of the 16-protons. The contributions of the 16-substituents to the chemical shift of the 17-proton are compared with similar values, obtained from 1-substituted acenaphthenes. Equations for the calculation of these contributions are presented for the trans compounds.
    Notes: Die 1H-NMR-Spektren epimerer 16-substituierter 17-Hydroxy-3-methoxyöstra-1,3,5(10)-triene werden zur Konfigurationsbestimmung herangezogen. Aus der Kopplungskonstante J16,17 kann die Konfiguration eindeutig ermittelt werden, wenn die vier möglichen Epimeren mit gleichem 16-Substituenten vorliegen. Liegt nur eine Verbindung vor, ist eine sichere Zuordnung allein durch J16,17 nur möglich, wenn J ≤ 2 Hz ist (16β,17α-Konfiguration der Substituenten) oder wenn J 〉 8 Hz ist (16β,17β-Konfiguration). Weitere zur Konfigurationsbestimmung geeignete Parameter sind die chemische Verschiebung der 13β-Methylprotonen und die des 17-Protons, die Tieffeldverschiebung dieses Signals nach Acetylierung oder nach „in situ“-Reaktion mit Trichloracetylisocyanat sowie chemische Verschiebung und Gesamtaufspaltung des 16-Protonensignals. Die Beiträge der 16-Substituenten zur chemischen Verschiebung des 17-Protons werden mit den aus 1-substituierten Acenaphthenen erhaltenen Werten verglichen. Gleichungen zur Berechnung dieser Beiträge für die trans-Verbindungen werden angegeben.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19773190310
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  • 4
    Electronic Resource
    Electronic Resource
    A Method for N-Alkylation of Acridones (1976)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 515-518 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19763180324
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  • 5
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine und 1,8-Naphthyridine. VI (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 907-921 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines and 1,8-naphthyridines. VI.The principle of the synthesis of 3-halomethyl-2,6-dichloro-pyridines has been extended to compounds with side chains of more than one carbon atom in the 3-position. Feasible synthetic routes are outlined starting from cheap, commercially available α-methylideneglutaronitrile and trichloroalkyl functional compounds which yield the intermediate 1,3,5-trisubstituted alkanes. These are cyclized by aqueous mineral acid or by hydrogen bromide in an organic solvent to 2-substituted glutarimids or hexahydronaphthyridinones, depending on the mode of cyclization. The final aromatization provides a simple route to pyridines or 1, 8-naphthyridines.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600321
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  • 6
    Electronic Resource
    Electronic Resource
    Application of the Equivalent Bond Orbital Model to the C2s-Ionization Energies of Saturated Hydrocarbons (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 2234-2247 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is shown that the ab initio STO-3G treatment applied to simple saturated linear, branched and cyclic hydrocarbons, assuming standard geometries, yields orbital energies ∊jSTO-3G for their canonical orbital ϕj which correlate perfectly with the observed C2s ionization energies Ijm, if Koopmans' approximation is accepted.Applying the Foster-Boys localization procedure to these canonical orbitals ϕj leads to localized orbitals λμ and their corresponding Hartree-Fock matrix Fλ = (Fλ,μv). An examination of the matrix elements Fλ,μv, i.e. of the self-energies Aμ = Fλ,μμ of the localized CC- and CH-orbitals λμ and of the cross terms Fλ, μv (μ ≠ v) between them, leads to the conclusion that a satisfactory approximation should be obtained by setting Aμ = A for all μ, Fλ,μv = B if λμ and λv are vicinal and neglecting all other cross terms. The resulting model is nothing but the well-known equivalent bond orbital model of Lennard-Jones & Hall, which however can now be calibrated using the known C2s-ionization energies of hydrocarbons. Due to the discrete structure and the wider range (∽ 8 eV) of the C2s band systems in the photoelectron spectra of these molecules this leads to a more satisfactory parametrization than using the narrower and badly resolved C2p band system.Comparison of calculated band positions using the calibrated model with observed C2s-band ionization energies for a series of hydrocarbons reveals that the simple equivalent bond orbital model is better than one might have expected.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600715
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  • 7
    Electronic Resource
    Electronic Resource
    Copper Catalysed Oxygenation of Bis (2-pyridyl) methane and 6-Methyl-bis (2-pyridyl)methane to the Corresponding Ketones (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 1097-1106 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ligands (L) bis (2-pyridyl) methane (BPM) and 6-methyl-bis (2-pyridyl)methane (MBPM) form the three complexes CuL2+, CuL22+, and Cu2L2H-22+ with Cu2+. Stability constants are log K1 = 6.23 ± 0.06, log K2 = 4.83 ± 0.01, and log K (Cu2L2H-22+ + 2H2+ ⇌ 2 CuL2+) = -10.99 ± 0.03 for BPM and 4.56 ± 0.02, 2.64 ± 0.02, and -11.17 ± 0.03 for MBPM, respectively. In the presence of catalytic amounts of Cu2+, the ligands are oxygenated to the corresponding ketones at room temperature and neutral pH.With BPM and 2,4,6-trimethylpyridine (TMP) as the substrate and the buffer base, respectively, the kinetics of the oxygenation can be described by the rate law \documentclass{article}\pagestyle{empty}\begin{document}$${{ - {\rm d}\left[{{\rm O}_2 } \right]} \mathord{\left/ {\vphantom {{ - {\rm d}\left[{{\rm O}_2 } \right]} {{\rm dt}}}} \right. \kern-\nulldelimiterspace} {{\rm dt}}} = {{k_1 \left[{{\rm CuL}_2^{2 + } } \right]} \mathord{\left/ {\vphantom {{k_1 \left[{{\rm CuL}_2^{2 + } } \right]} {\left[{{\rm H}^ + } \right]}}} \right. \kern-\nulldelimiterspace} {\left[{{\rm H}^ + } \right]}} + k_2 \left[{{\rm CuL}_2^{2 + } } \right]\left[{{\rm TMP}} \right] + {{k_3 \left[{{\rm CuL}^{2 + } } \right]} \mathord{\left/ {\vphantom {{k_3 \left[{{\rm CuL}^{2 + } } \right]} {\left[{{\rm H}^ + } \right]}}} \right. \kern-\nulldelimiterspace} {\left[{{\rm H}^ + } \right]}} + {{k_4 \left[{{\rm Cu}_2 {\rm L}_2 {\rm H}_{ - 2}^{2 + } } \right]} \mathord{\left/ {\vphantom {{k_4 \left[{{\rm Cu}_2 {\rm L}_2 {\rm H}_{ - 2}^{2 + } } \right]} {\left[{{\rm H}^ + } \right]}}} \right. \kern-\nulldelimiterspace} {\left[{{\rm H}^ + } \right]}}$$\end{document} with k1 = (5.9 ± 0.2) · 10-13 mol l-1 s-1, k2 = (4.0 ± 0.6) · 10-4 mol-1 ls-1, k3 = (1.1 ± 0.1) · 10-12 mol l-1 s-1, and k4 = (9 ± 2) · 10-14 mol l-1 s-1.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610320
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  • 8
    Electronic Resource
    Electronic Resource
    Propellanes. L. Further support for control by secondary orbital overlap during Diels-Alder reactions of certain propellanesPart XLIX: see P. Ashkenazi, M. Peled, E. Vogel & D. Ginsburg, Tetrahedron, in press.,Dedicated to Prof. Dr. h.c. A.S. Dreiding on the occasion of his 60th birthday (1979)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 62 (1979), S. 1326-1329 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In contrast to the behavior of 4-substituted-1,2, 4-triazoline-3, 5-diones which add to the syn-face of the cyclohexadiene with respect to the hetero-ring in propellanes of type 1, dienophiles containing a C, C double bond instead of an N, N double bond add exclusively to the anti-face of the same substrates. This supports our thesis that these reactions are controlled by secondary orbital interaction between the N, N dienophiles and the hetero-ring of the substrates, an interaction which cannot exist in the C, C dienophiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19790620446
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  • 9
    Electronic Resource
    Electronic Resource
    Enamines I. Vinyl Amine, a Theoretical Study of its Structure, electrostatic potential, and proton affinity (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 1407-1418 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of vinyl amine and its reactivity towards a proton is studied by the PRDDO SCF MO method. The equilibrium structure is found to be non-planar and barriers to inversion- and rotation-dominated processes are calculated. Proton addition to vinyl amine, as a model of enamine protonation, is examined by means of electrostatic molecular potentials and C- versus N-proton affinities.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610425
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  • 10
    Electronic Resource
    Electronic Resource
    Structural Studies of Crystalline Enamines (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 3108-3135 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystal structure analyses of five crystalline enamines together with recently published structural data for two other enamines reveal varying degree of pyramidality at the enamine nitrogen atom. The pyramidality appears to be most pronounced in enamines from piperidine and morpholine, less so in enamines derived from prolinoid amines. A pyrolidine enamine obtained from a derivative of cyclohexane-1,4-dione seems to have a virtually planar enamine group. The implications of these findings for current stereochemical problems in enamine chemistry are discussed.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610839
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