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  • Chemistry  (6)
  • Solvent polarity  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Raumchemie und Konstitution der MetallcarbonylwasserstoffeHeinrich Wieland zum 75. Geburtstag.Vergl. a. W. Hieber, K. Ries u. G. Bader, Ztschr. anorgan. Chem. 190, 215 [1930]. (XLIX. Mitteil. über MetallcarbonyleXLVIII. Mitteil.: W. Hieber u. E. Böckly, Ztschr. anorgan. Chem. 262, 344 [1950].) (1952)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 85 (1952), S. 647-654 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die Dichte und die Oberflächenbehandlung von Kobalt- und Eisencarbonylwasserstoff bestimmt und hieraus das Molvolumen und der Parachor dieser Verbindungen berechnet.Die Molvolumina von Co(CO)4H und Fe(CO)4H2 sind kleiner als das Molvolumen von Ni(CO)4. Hieraus ergibt sich die überraschende Tatsache, daß der Eintritt von Wasserstoffatomen auf den Komplex Me(CO)4 kontrahierend wirkt. Auch aus dem Parachor der Metallcarbonylhydride ist auf eine besondere Bindungsart des Wasserstoffs zu schließen. Unter Berücksichtigung der Ergebnisse von Brockway und Mitarbeitern lassen sich die beobachteten Anomalien valenztheoretisch deuten und Aussagen über die Konstitution der Carbonylhydride machen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19520850626
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  • 2
    Electronic Resource
    Electronic Resource
    Aza-crown ethers with quinone side chains: Synthesis, complexation, and protonation (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1673-1677 
    Details
    ISSN: 0009-2940
    Keywords: Crown ethers, quinoid ; Alkali metal complexes ; Alkaline earth metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and spectroscopic investigation of aza-crown ethers with anthraquinone- and 1-aminoanthraquinone-functionalized side chains are described. Cation-induced shifts in the UV/VIS absorption spectra of the ligands dissolved in propylene carbonate are observed only for Li+ among the alkali metal ions and for Mg2+ among the alkaline earth metal ions as well as for Ag+ and Tl+. Only hypsochromic shifts of the absorption spectra of anthraquinone-bearing aza-crown ethers are observed on protonation. The variations of the extinction coefficients are discussed with respect to the sequence of protonation of the different amino groups.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230816
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  • 3
    Electronic Resource
    Electronic Resource
    Sterisch gehinderte Pyrrolidine. Umsetzung von 2,5,5-Trimethyl-1-pyrrolin-1-oxid mit α-Chloracrylnitril (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 726-729 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of the nitrone 1 with α-chloroacrylonitrile (4) as ketene equivalent yields the 5-isoxazolidinone 2a and the α-chloroimine 5. The mechanism of the reaction is discussed. The compound 2a is useful for the synthesis of hindered pyrrolidines 3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650310
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  • 4
    Electronic Resource
    Electronic Resource
    Cycloadditionen und Umlagerungen bei Umsetzungen von Bromwasserstoff mit Alkinen (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1137-1150 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditions and Rearrangements During the Interaction of Hydrogen Bromide with AlkynesLiquid phase reactions of anhydrous hydrogen bromide with some alkynes were studied. In addition to products formed by conventional ionic and/or radical additions, 1-butyne (4a), 1-pentyne (4b), 1-hexyne (4c) and 3-cyclohexyl-1-propyne (4d) afforded in each case the corresponding cyclodimerization products 5 and/or 6 having 1,3-dialkyl-1,3-dibromocyclobutane structures. Under certain conditions 3,3-dimethyl-1-butyne (19) afforded 2,3-dibromo-2,3-dimethylbutane (28) and 1,3-dibromo-2,3-dimethylbutane (31). 2-Butyne (32) yielded four (33 - 36) of the five possible 1,3-dibromo-1,2,3,4-tetramethylcyclobutanes if HBr was used in excess, whereas the two stereo-isomeric 3-bromo-1,2,3,4-tetramethylcyclobutenes 38 and 39 were formed if a deficient amount of HBr was used.
    Notes: Die Flüssigphasenreaktionen von wasserfreiem Bromwasserstoff mit einigen Acetylenverbindungen wurden untersucht. Zusätzlich zu den durch konventionelle ionische und/oder radikalische Addition erhaltenen Produkten wurden aus 1-Butin (4a), 1-Pentin (4b), 1-Hexin (4c) und 3-Cyclohexyl-1-propin (4d) die entsprechenden Cyclodimeren 5 und/oder 6 mit 1,3-Dialkyl-1,3-dibromcyclobutanstrukturen gewonnen. Aus 3,3-Dimethyl-1-butin (19) entstanden unter be-stimmten Bedingungen 2,3-Dibrom-2,3-dimethylbutan (28) und 1,3-Dibrom-2,3-dimethylbutan (31). 2-Butin (32) lieferte mit überschüssigem HBr vier (33-36) der fünf möglichen 1,3-Dibrom-1,2,3,4-tetramethylcyclobutane und mit HBr im Unterschuß die beiden stereoisomeren 3-Brom-1,2,3,4-tetramethylcyclobutene 38 und 39.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790810
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  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of the solvent polarities of room-temperature liquid ethylammonium nitrate and its mixtures with polar solvents (1991)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1991 (1991), S. 27-31 
    Details
    ISSN: 0170-2041
    Keywords: Ethylammonium nitrate ; Solvent polarity ; ET(30) scale ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The maximum wavelength of the solvatochromic absorption band of Dimroth-Reichardt's dye I, 2,4,6-triphenylpyridinium N-4-(2,6-diphenylphenoxide) betaine, has been determined at 25°C from the ultraviolet-visible spectra of solutions of this dye in ethylammonium nitrate (EAN) and its mixtures with several polar solvents. The related molar transition energy, ET(30) in kcal/mol, of the long-wavelength absorption band increases sharply, when EAN is dissolved at low concentrations in the various solvents. The pronounced blue shift of the absorption band is attributed to the hydrogen-bond interaction between the ethylammonium cation and the ground state of the betaine molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199119910105
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  • 6
    Electronic Resource
    Electronic Resource
    Über den Zusammenhang zwischen Konstitution und Pfeffer-Geschmack (1. Mitteilung) (1923)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 56 (1923), S. 699-711 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19230560322
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