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  • Studies toward the total synthesis of (+)-providencin

    Creator:
    Jana, Somnath
    Abstract:
    Studies toward the total synthesis of (+)-providencin (1), a highly oxygenated cembranoid dipterpene with a unique bicyclo[12.2.0]hexadecane skeleton and pronounced biological activity, are described. These studies resulted in the synthesis of advanced intermediates 320 and 332 which contain all of the carbon atoms of 1. In a first generation approach...
    Resource Type:
    Dissertation
    Full Text:
    to couple the two major fragments, 228 and 288, using palladium-catalyzed C-H activation of the

  • A study of the biosynthesis of sterols and related compounds by a bovine aorta preparation

    Creator:
    Walsh, Marilyn Ruth
    Abstract:
    Previous investigations of the biosynthesis of sterols by the arterial wall have shown that the intact aorta is capable of low level incorporation of labeled precursor into a sterol digitonide. The biosynthesis of sterols and related lipids by a cell-free preparation of bovine aorta was investigated in the present study....
    Resource Type:
    Masters Thesis
    Full Text:
    OF SCIENCE (Name) (Degree) in Chemistry (Biochemistry) presented on (Major) r¿'4 J'7jI`ï (Date

  • Preparation and Lewis acid properties of diboron tetrafluoride and related compounds

    Creator:
    Hansen, John Donald
    Abstract:
    Attempts to synthesize diboron tetrafluoride by the reduction of boron trifluoride with alkali metal solutions in 1, 2-dimethoxyethane proved to be unsuccessful. No diboron tetrahalide was found when boron trifluoride, antimony trifluoride, or boron trichloride was reacted with tetra-(dimethylamino)-diboron; although there appeared to be some exchange between chloride and amine...
    Resource Type:
    Dissertation
    Full Text:
    12.5 cm 4 mm. H Figure 1. All metal sealed gas cell for infrared spectra. (A) Pyrex glass cylinder

  • A study of the limitations of ultraviolet spectral data for the determination of dissociation constants of organic nitrogeneous bases

    Creator:
    Vachananda, Sookapracha
    Abstract:
    Ultraviolet spectroscopic methods for the determination of dissociation constants can only be applied to those compounds having protonatable sites conjugated with or inherent in a chromophoric group of the compound. The determination of the dissociation constants of organic nitrogeneous bases by ultraviolet spectroscopic methods was found to be only reliable...
    Resource Type:
    Dissertation
    Full Text:
    Transmission Curve 12 4. E versus pH of Acetanilide by Method I 51 5. E versus pH of p- Aminophenylacetic