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  • 1970-1974  (5)
  • 1
    Publication Date: 1974-08-01
    Print ISSN: 0029-554X
    Electronic ISSN: 1878-3759
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Published by Elsevier
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  • 2
    Publication Date: 2022-05-10
    Description: Von den 50 bisher aus der Kieler Bucht nachgewiesenen Hydroidenarten werden einige ökologische Aspekte dargestellt. Die Besonderheiten des Salzgehaltes, der Temperatur und des Substratangebotes in der westlichen Ostsee werden in ihrer Wirkung auf die Hydroiden beschrieben. Der bestandsmindernde, indirekte Einfluß von Licht auf Flachwasser-Hydroidengemeinschaften wird dargestellt. Ecological aspects concerning the 50 species of hydroids known from the Kiel Bay are discussed. The effects of salinity, temperature and substrate availability on these species in the Western part of the Baltic are described. It is pointed that light influences the density of hydroid populations in shallow waters by favouring the growth of algae competing with hydroids for space.
    Type: Article , NonPeerReviewed
    Format: text
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 462-475 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Imine-Enamine Tautomerism, II1).  -  Tautomerism of Iminomethyl DisulfidesSulfenyl chlorides react with secondary thioamides to give iminomethyl disulfides 3a. Certain substituted thioamides having at least one hydrogen on the α-C atom form disulfides which are able to tautomerize to aminovinyl disulfides 3b. The tautomeric equilibrium is determined by the type of substitution on the α-C atom and on nitrogen. When there is a low degree of substitution on the α-C atom of the secondary thioamides S,N-sulfenylated thioamides are easily formed, whereas asymmetric iminomethyl disulfides formed from primary thioamides are not stable and react further to give symmetric trisulfides.
    Notes: Sekundäre Thioamide reagieren mit Sulfenylchloriden zu den Iminomethyldisulfiden 3a. Bei Disulfiden aus geeignet substituierten Thioamiden mit mindestens einem Wasserstoffatom am α-ständigen C-Atom kann eine Umlagerung zu den tautomeren Aminovinyldisulfiden 3b erfolgen. Das Tautomeriegleichgewicht wird von der Art der Substituenten am Stickstoff und am α-C-Atom des Thioamids bestimmt. Bei weniger Substituenten am α-C-Atom des sekundären Thioamids werden leicht S,N-sulfenylierte Thioamide gebildet, während asymmetrische Iminomethyldisulfide aus primären Thioamiden nicht beständig sind und zu symmetrischen Trisulfiden weiterreagieren.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 776-797 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Imine-Enamine Tautomerism, III1). - Tautomerism of N-(Ary1)iminomethyl DisulfidesThe tautomeric equilibrium between iminomethyl disulfides 1a formed by sulfenylation of thiocarboxanilides and aminovinyl disulfides 1b is determined by the type of substitution on the β-C atom and on the nitrogen atom. Aminovinyl disulfides are stabilized by electron- withdrawing substituents on the β-C atom and by intramolecular hydrogen bonding, whereas the stability of iminomethyl disulfides is considerably enhanced by electron-with- drawing substituents on nitrogen. In the case of compounds 20-30 the influence of the aro- matic substituents on nitrogen is given by the Hammett σ-values.
    Notes: Die durch Sulfenylierung von Thiocarbonsäureaniliden erhaltenen Iminomethyldisulfide 1a stehen mit den Aminovinyldisulfiden 1b in einem Tautomeriegleichgewicht, dessen Lage substituentenabhängig ist. Elektronenziehende Gruppen am β-ständigen C-Atom und die Ausbildung intramolekularer Wasserstoffbrücken stabilisieren das Aminovinyldisulfid, während elektronenziehende Substituenten an der N-Phenylgruppe das Iminomethyldisulfid begünstigen. Für die Verbindungen 20-30 kann die Abhängigkeit der Gleichgewichtslage vom Substituenten am Stickstoffatom durch eine Hammett-Beziehung beschrieben werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 765-775 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Thioamides and Their Derivatives, XXIX1). - Thermodynamic Acidity of ThioanilidesThe acidities of several aromatic thioamides have been determined by potentiometric titration in dimethyl sulfoxide/water. Depending upon the nature of the substituent at the α-C atom the thioanilides show NH, CH, OH or SH acidity. The effect of the substituent and of solvent on the pKa-values of the thioamides is discussed.
    Notes: Die Acidität von Thioaniliden wird durch potentiometrisch indizierte Titration in Dimethylsulfoxid/Wasser bestimmt. Je nach Art der Substituenten am α-C-Atom zeigen aromatisch substituierte Thioamide NH-, CH-, OH- oder SH-Acidität. Die pKa-Werte der Thioamide können durch Substituenteneffekte und Lösungsmitteleinflüsse gedeutet werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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