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  • Allene  (1)
  • Dale-Mosher model  (1)
  • Hydrazones  (1)
  • Mass Spectrometry  (1)
  • NMR Spectra  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 126 (1995), S. 1151-1159 
    ISSN: 1434-4475
    Keywords: Allene ; 2,2-Dimethylpenta-3,4-dienal ; Hydrazones ; Spectroscopy ; X-ray structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Herstellung einiger neuer 2,2-Dimethylpenta-3,4-dienal — Derivate durchClaisen-Cope — Umlagerung der Pyrolyseprodukte der entsprechenden Acetale und anschließende Kondensationsreaktion wird beschrieben. Die Synthese des Homoallenlketons5 durchGrignard — Reaktion und darauffolgende Oxidation des gebildeten Alkohols mit Kaliumchlorochromate (KCC) wird vorgestellt. Alle neuen Verbindungen werden mittels IR-, MS-,1H- und13C-NMR-Spektroskopie charakterisiert. Die NMR — Signale werden mittels C, H-Korrelationsexperimenten (direkt und long-range) eindeutig zugeordnet. Die Struktur von 2,2-Dimethylhexa-3,4-dienal-2,4-dinitrophenyl-hydrazon in Lösung und im Kristall wird diskutiert.
    Notes: Summary The preparation of some new 2,2-dimethylpenta-3,4-dienal derivatives starting byClaisen-Cope rearrangement of the pyrolytic product of the corresponding acetales and followed by condensation reactions is described. The synthesis of homoallenylketone5 from homoallenylaldehyde3 byGrignard reaction and followed by the oxidation of the formed alcohol using potassium chlorochromate (KCC) is reported. All new compounds are characterized by IR, MS,1H, and13C NMR spectroscopy. The full assignment of the NMR signals is based on HETCOR and FLOCK pulse sequences. The molecular and crystal structure of 2,2-dimethylhexa-3,4-dienal 2,4-dinitrophenylhydrazone is presented.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0899-0042
    Keywords: cyclohexanols ; sterols ; Dale-Mosher model ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From a study of the 13C-shift values of the MTPA esters of 3-substituted cyclohexanols of known absolute configuration an empirical rule has been developed to determine the absolute configuration of chiral cyclohexanols. The method is based on the Dale-Mosher model, which was originally developed for 1H-NMR spectra. The scope and limitations of this method are discussed. The enantiomeric purity of the alcohols can be determined simultaneously by integration of the signals in well-resolved diastereotopic carbon pairs.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0947-3440
    Keywords: Sensitizing dyes ; Mass Spectrometry ; NMR Spectra ; Electron distribution ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The multi-step synthesis of two benzimidazole trimethine cyanines as possible green sensitizing dyes (Gs3-1, Gs3-2) is reported. Compounds were characterized from UV-Vis, mass spectroscopic and NMR data. The charge density distributions of the two compounds, calculated using the semi-empirical MOPAC 93 package, are in agreement with assignments in NMR spectroscopy. Sensitizing properties of the cyanine dyes were evaluated in actual photographic T-grain emulsions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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