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  • Organic Chemistry  (2)
  • 36.40
  • 1985-1989  (2)
  • 1975-1979  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 12 (1989), S. 435-437 
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.20 ; 78.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A cluster beam experiment for fluorescence measurements on rare gas clusters has been built up. First results on the evolution of energy levels of neutral krypton clusters with a cluster size between 200–8500 atoms/cluster are reported. The well known bulk excitons of solid krypton do not merge into the first atomic lines and appear only in clusters larger than 300 atoms/cluster. Smaller clusters absorb only at energies which fit well with surface excitons of the solid.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1976 (1976), S. 348-351 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dialkylation in the Presence of 1,8-Diazabicyclo[5.4.0]undec-7-eneCH-active compounds 2 may be smoothly dialkylated by the aliphatic bromo compounds 3 in the presence of 1,8-diazabicyclo[5.4.O]undec-7-ene (1). The reaction can be applied to dihalo compounds and affords the cycloalkyl compounds 5, 6 and the cyclopentenyl compounds 7. In an analogous manner, tetraethyl ethylenetetracarboxylate is prepared by reaction of diethyl malonate and diethyl dibromomalonate.
    Notes: CH-aktive Verbindungen 2 lassen sich in Gegenwart von 1,8-Diazabicyclo[5.4.O]undec-7-en (1) mit den aliphatischen Bromiden 3 glatt dialkylieren. Die Reaktion ist auf Dihalogenverbindungen übertragbar und führt zu den Cycloalkylverbindungen 5 und 6 sowie zu den Cyclopentenylverbindungen 7. Äthylentetracarbonsäure-tetraathylester entsteht analog aus Malonsäurediathylester und Dibrommalonsäurediathylester.
    Additional Material: 2 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 893-898 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New Azoolefines and their Acidic cleavage to Aryldiimines3-Amino-1-aryl-3′,3′-dimethyl-pyrazolin-4-spiro-2′-oxiran-5-ones (3a-c) undergo ring opening with methoxide forming methyl 3-amino-3-arylazo-propenoates (5a-c). 5a-c are cleaved under acidic conditions. The main products of the cleavage of 5c with methanolic hydrochloric acid are nitrogen, 2, 4, 6-trichloro-benzen (6), 2, 4, 6-trichloro-aniline (9) and 2, 4, 6-trichlorophenylhydrazine (10). Intermediates of the cleavage of 5 are aryldiimines trapped with benzaldehyde as the corresponding benzhydrazides (12a, b).
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