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  • 1980-1984  (6)
  • Organic Chemistry  (5)
  • Daphnia  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Population dynamics and production of Daphnia hyalina Leydig and Daphnia cucullata Sars in Tjeukemeer (1982)
    Springer
    Hydrobiologia 95 (1982), S. 235-259 
    Details
    ISSN: 1573-5117
    Keywords: population dynamics ; secondary production ; Cladocera ; Daphnia ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As part of a research programme on the food chains in Tjeukemeer, the Daphnia hyalina and Daphnia cucullata populations were studied for three successive years. To analyse the factors regulating the production of these two species, their population parameters (density, size distribution, fecundity) and population dynamics (birth rate, mortality rate) were studied and related to environmental factors. Since Daphnia in Tjeukemeer shows continuous recruitment, the population dynamics model ‘INSTAR’ was developed and used to integrate field data with laboratory data on development rates and length-weight relationships. The dynamics of the Daphnia species are mainly regulated by temperature and fish predation, the latter affects both birth rate and mortality. Total annual Daphnia production was 3.1–6.9 g org. dry wt M−2, and annual P/B ratio ranged from 25 to 40 for D. cucullata and from 45 to 49 for D. hyalina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044487
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  • 2
    Electronic Resource
    Electronic Resource
    Über die Thiocyanierung von AcetylendicarbonsäuredialkylesternI. Mitteilung der Serie „Organische Elektronenleiter und Vorstufen“ (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 153-156 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Thiocyanation of Dialkyl Acetylendicarboxylates
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250119
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Chlorierung von N-Aryl-2,4-dimethyl-buta-1,3-dien-1,4-sultamenHerrn Prof. Dr. J. Ulbricht zum 60. Geburtstag gewidmet (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 545-555 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About Chlorination of N-Aryl-2,4-dimethyl-buta-1,3-dien-1,4-sultamesThe sultames of structure 1 are easily chlorinated by sulfurylchloride, chlorine or tertbutylhypochlorite. The structure of the mono-(2a-c,3a, d), di-(4a-d), tri- (5c, d) and pentachlorosultames (6a, b) is determined by 13C-n.m.r. spectroscopy. Contrary to the bromination the chlorination (by SO2Cl2) starts with the substitution of the sultamring (formation of mono- and di-chlorosultames) followed of the substitution of the (C-4)-CH3- group (formation of trichlorosultames). By 1,4-addition of an other molecule of chlorine to 5 the pentachlorosultames 6a, b are obtained. Already by recrystalisation of 6a, b in an alcohol the chlorine in 4-position is exchanged by the corresponding alkoxy group (CH3O, C2H5O, n-C3H7O) and the compounds 7-9 are formed.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260404
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese und Oxydation von 1-(1,3-Thiazol-2-yl)-pyrazolid-3-onen (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 873-881 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Oxydation of 1-(1,3-Thiazol-2-yl)-pyrazolidin-3-onesThe 1-(1,3-thiazol-2-yl)-pyrazolid-3-ones 4 are synthesized by reaction of 1-thiocarbamoyl-pyrazolidin-3-one 2 with α-halogenaldehydes and α-halogenketones, respectively. The structure of 4 is proved by their 1H-n.m.r. and mass spectra. Oxydative dimerisation of 4 leads to the bisazomethinimines 10. The compounds 10 represent a new type of azomethinimines with a quinoid structure.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240602
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  • 5
    Electronic Resource
    Electronic Resource
    Tetrathiafulvalene. XXI. Synthese von Tetrathiafulvalenen aus 2-Alkylthio-, 2-Arylthio- und 2-Alkylseleno-1,3-dithioliumsalzen (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 479-484 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrathiafulvalenes. XXI. Syntheses of Tetrathiafulvalenes from 2-Alkylthio-, 2-Arylthio- and 2-Alkylseleno-1,3-dithiolium SaltsIn the reaction of 2-alkylthio-, 2-arylthio- or 2-alkylseleno-1, 3-dithiolium salts with trivalent phosphorus compounds in acetonitril tetrathiafulvalenes 2 are formed. As an intermediate we suppose a phosphorane, which reacts with further 1,3-dithiolium salt to provide the tetrathiafulvalene. By the application of a 2-alkylthio-1,3-dithiolium salt a monomethin dye is formed in a side reaction. When the reaction is carried out in methanol, the phosphorane is trapped by the solvent and a 2H-1,3-dithiolium salt is obtained.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260316
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  • 6
    Electronic Resource
    Electronic Resource
    Arylierung von Thiocarbonylverbindungen mit Diazoniumsalzen (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 669-672 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Arylation of Thiocarbonyl Compounds by Arenediazonium Salts
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240425
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