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  • Organic Chemistry  (30)
  • Wiley-Blackwell  (30)
  • Springer
  • 1980-1984  (30)
  • 1982  (30)
  • 1
    Electronic Resource
    Electronic Resource
    Über die katalysierte Flüssigphasenoxidation von cis- und trans-Oct-4-enNach einem Vortrag auf der X. Komplexkatalysetagung in Rostock 1980. (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 596-608 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Catalyzed Liquid-Phase Oxidation of cis- and trans-Oct-4-eneThe influences of MoO2(acac)2acac-Acetylacetonat. , MoO 3 and Co(acac) 3 on the liquid-phase oxidation of cis- and trans-oct-4-ene at 110°C were studied. In the presence of molybdenum catalysts the yield of epoxides and the stereoselectivity of epoxide formation are increased. The results are in good agreement with the hypothesis that molybdenum compounds effect only the stereospecific reaction of the hydroperoxides formed with the starting olefin yielding the corresponding epoxide.The cobaltic complex increases the rate of autoxidation, but has no remarkable influence on the yield of epoxides. In the presence of Co(acac)3 more trans-epoxide is formed from cis-oct-4-ene than in the uncatalyzed reaction. This can be explained by an increase of the lifetime of the intermediate peroxyalkyl radical, effected by complex formation of the radical with a cobalt species.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240415
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Temperatur- und Viskositätsabhängigkeit der Fluoreszenzquantenausbeuten von donator-substituierten 4′-Diphenylphosphinyl-trans-stilbenen in wenig viskosen Lösungsmitteln unterschiedlicher Polarität (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 887-895 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Dependence of Fluorescence Quantum Yields of Donor Substituted 4′-Diphenylphosphinyl trans-Stilbenes on Temperature and Viscosity in Low Viscous Solvents of Different PolarityThe dependence of fluorescence quantum yields of donor substituted 4′-diphenylphosphinyl trans-stilbenes 1 on temperature was investigated between 15-65°C in toluene and n-propanol. It is concluded that the fluorescence quantum yield dependence on temperature is due to the dependence of nonradiative deactivation on solvent viscosity. The nonradiative deactivation is attributed to the ethylene bond rotation in 1. The rotation around the ethylenic bond and the fluorescence are the two most important deactivation processes detected up to now for the first excited singlet of 1 in liquid solution.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240604
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  • 3
    Electronic Resource
    Electronic Resource
    Photochemie adsorbierter Moleküle. VHerrn Prof. Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet. ESR-Untersuchungen von Phenylkationen bei der Photolyse von Arendiazoniumsalzen im Festkörper und im adsorbierten Zustand (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 209-216 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photochemistry of Adsorbed Molecules. V. E.S.R.-Investigations of Phenyl Cations during Photolysis of Arendiazonium Salts in the Polycrystalline and the Adsorbed StateDuring photolysis of 4-NR2-substituted arene diazonium salts ground state triplets occur at low temperatures in the e.s.r.-spectra with (π)5(sp2)1 configuration in the polycrystalline as well as in the adsorbed state on SiO2. The influence of anions and the reaction order of decay processes are discussed. The decay of the aryl cations were also investigated in the presence of pyrene as π-electron donor. Reaction takes place with coadsorbed molecules and the decay mechanism changes from ionic character to radical character.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240205
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  • 4
    Electronic Resource
    Electronic Resource
    Angeolide, a Novel Lactone from Angelica glauca (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 699-707 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Angeolid, ein neues Lacton aus Angelica glaucaDie Struktur und Stereochemie von Angeolid (1), einem neuen dimeren Lacton aus Angelica glauca Edgew. wurde mittels Röntgenstrukturanalyse aufgeklärt. Angeolid stellte sich als das Dimere von Butylidenphthalid 2 (Ligustilid) heraus. Die beiden isomeren Ligustilide wurden aus der oben genannten Pflanze gewonnen und ihre Stereochemie wurde aufgeklärt. Die Verwandtschaft von Angeolid (1) und Ligustilid wurde auf chemischem Wege nachgewiesen.
    Notes: The structure and stereochemistry of angeolide (1), a novel dimeric lactone isolated from Angelica glauca Edgew., have been determined by X-ray analysis. Angeolide has been found to be the dimer of the butylidenephthalide 2 (ligustilide). The two isomeric ligustilides have been isolated from this plant and their stereochemistry has been determined. The relationship between angeolide (1) and ligustilide has been confirmed by chemical transformation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820409
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  • 5
    Electronic Resource
    Electronic Resource
    Formation and dissociation mechanism of amide complexes. VPart IV, see [1]. Interconversion of dimeric and monomeric Cu2+-complexes with 1,8-diamino-3,6-diaza-2,7-octanedione: Comparison between the reactivity of terminal and internal amide groups (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 753-761 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The protonation and deprotonation rates of the coordinated amide groups in the Cu2+-complexes of 1,8-diamino-3,6-diaza-2,7-octanedione (DED = L) have been studied by stopped-flow techniques. Starting at low pH from Cu2+ and DED the dimeric Cu2L24+-complex, fully formed within the mixing time of the stopped-flow instrument, reacts in two consecutive steps to yield the final product CuLH-2. The rate constants of the forward and backward reactions have been determined and are given in Table 1. The intermediate was identified as Cu2L2H-22+ by measuring its VIS.-absorption spectrum.The rate constants for the interconversion of the amide groups from the O- to the N-coordinated form in the Cu2+-complexes of DED, 2,10-dioxo-1, 4, 8, 11 tetraazaundecane (DANA) and triglycine (TRIGLY) are compared with each other. It is shown that these rate constants are similar, no matter whether the amide group is terminal or internal as long as the rotation is easily possible as is the case in the dimeric species Cu2L24+ and Cu2L2H-22+. However, for CuLH-2 the inter-conversion only takes place after opening of one of the chelate rings in a rapid protonation preequilibrium.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650313
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  • 6
    Electronic Resource
    Electronic Resource
    Structural Characteristics of the Carboxylic Ester Group (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1547-1554 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Average bond distances and bond angles in carboxylic esters with different substitution patterns have been derived by analyzing data from many crystal structures retrieved from the Cambridge Structural Database (CSD). Conformation-al preferences in the attachment of substituents are found.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650528
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  • 7
    Electronic Resource
    Electronic Resource
    Structural Characteristics of the Carboxylic Amide Group (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1555-1562 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Average bond distances and bond angles as well as conformational preferences in the ϕ and ψ torsion angles of carboxylic amides with different substitution patterns have been derived by analyzing data from many crystal structures retrieved from the Cambridge Structural Database (CSD).
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650529
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  • 8
    Electronic Resource
    Electronic Resource
    Directional Preferences of Ether O-Atoms Towards Alkali and Alkaline Earth Cations (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1482-1488 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An analysis of the environments of alkali and alkaline earth cations complexed to ethers has been made with the Cambridge Structural Database. The cations invariably lie close to the bisecting plane through the O-atoms. The larger cations show an apparent preference to approach the ether group along a tetrahedral lone pair direction, whereas Li+ cations tend to be found along the C—O—C bisector, i.e., along the trigonal lone pair direction. These observations are discussed in relation to recent theoretical and experimental findings.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650522
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  • 9
    Electronic Resource
    Electronic Resource
    Transition metal ions and amides. VIII.Part VIII, see [1]; Part VI, see [2]. Discrimination between different models for the complexation of Cu2+ with N, N′-diglycyl 1, 2-ethanediamine, N, N′-diglycyl-1, 3-propanediamine and glycine ethylamide by potentiometric or by spectrophotometric titration (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 46-54 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complexation of Cue2+ with 1, 8-diamino-3, 6-diaza-2, 7-octanedione (—N, N′-diglycyl-1, 2-ethanediamine, DED) and with 1, 9-diamino-3, 7-diaza-2, 8nonanedione (—N, N′-diglycyl-1, 3-propanediamine, DPD) has been studied by potentiometric and by spectrophotometric titration. With both ligands L the complexation to Cue2+ leads to relatively complicated equilibria with CuLH3+, CuL2+, CuLH-2, and dimeric Cu2L24+ complexes. With DED, another dimeric species, Cu2L2H-22+, is formed in addition. Independent numerical treatment of spectrophotometric and poteritiometric titrations was used to obtain a satisfactory model for the complexation and to test the relative discriminatory power of the two methods. Titrations of glycine ethylamide (GEA) were used as an additional test and as a model for DED and DPD. It was shown that in each case spectrophotometric titrations give results of similar reproducibility and have a discriminatory power equal to or better than potentiometric titrations, provided that optimum mathematical algorithms are used in the numerical treatment.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650106
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  • 10
    Electronic Resource
    Electronic Resource
    Cuprous complexes and dioxygen. IXPart VIII, see [1]. Formation of a unique trimeric species Cu3L3+2 and Ligand Oxidation (L = cis, cis-1, 3, 5-cyclohexanetriamine) (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 2529-2539 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complexation of Cu+ by the potentially tripod like ligand cis, cis-1, 3, 5 cyclohexanetriamine (chta) has been studied potentiometrically in aqueous acetonitrile (an). The expected tetracoordinated species Cu (chta) ⇌ (an)+ was formed only at rather high pH with log K (Cu (an)+ + chta ⇌ Cu (chta) · (an)+) = 6.94. Quite unexpectedly the most stable complex in neutral solution was the trimetric species Cu3 (chta)23+ with log K (3 Cu+ + 2 chta ⇌ Cu3 (chta)23+) = 31.75. In addition, the ternary complexes Cu (LH2) · (an)3+ and Cu (LH) · (an)2+ (L = chta) are formed at low pH.From model considerations, Cu3 (chta)23+ must contain two ligand molecules with all amino groups in equatorial position, linked by three linearly coordinated Cu+-ions. Cu3 (chta)3+2 shows no measurable reactivity towards dioxygen. At pH values above 9, very rapid O2-uptake due to Cu (chta) · (an)+ is observed. In this reaction, Cu+-autoxidation is stoichiometrically coupled to ligand oxidation, followed by a much slower Cu-catalyzed secondary reaction of the primary oxidation product of chta. Hydrogen peroxide and likely also superoxide, are involved in the coupled Cu+/ligand oxidation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650823
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