Part I. Elucidation of the Course of the Characteristic Ring D Fragmentation of Unsaturated Steroids: Part II. Characteristic Fragmentations of Cholesterol and Cholesterol Acetate |
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7-steroids 70 ev Fig 70eV Spectrum 80 Relative Abundance Abundance 40 20 acetic acid acetone allylic Anal analogous angular methyl group benzoate brine and dried C-3 equatorial calc Cent Total lonization Chem Cholest-8 cholestenes cholesterol acetate chromatography deuterium labeling deuterium transfer diglyme Djerassi double bond dried over MgSO4 eluted ether/hexane evaporated extracted into ether free sterol hydrogen transfer ionized isomerization isotopic composition ketone labeled cholesterols lead tetraacetate loss of C-19 m/e Per Cent Mass Spectral Peaks mass spectrometer mass spectrum metastable defocusing methanol mixture NMR identical olefins oxidation peak at m/e pregnane proton R₁ R₂ radical recrystallized recrystallized from methanol reduced refluxed Relative Abundance 40 result ring D cleavage ring D fragment rinsed saturated steroids Scheme side chain silica solvent spectra Spectrum of 5a-Cholest-8 spectrum of cholesterol steroidal olefins steroids sterol stirred substituent Table Total lonization 40 unlabeled compound vinyl