Characterization of C-4-methylated sterols by pyridine-induced solvent shifts in proton magnetic resonance spectroscopy |
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| Authors: | Iida Takashi Tamura Toshitake Miura Nobumasa Matsumoto Taro |
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| Institution: | College of Engineering, Nihon University 1, Tokusada Nakagawara, Koriyama-shi, Fukushima-ken, 963 Japan;College of Science and Technology, Nihon University 8, Kanda Surugadai, 1-chome, Chiyoda-ku, Tokyo, 101 Japan |
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| Abstract: | The proton magnetic resonance (PMR) spectra were measured in deuterochloroform (CDCl3) and pyridine solutions for some 4-desmethyl, 4α-methy1, 4β-methyl, and 4,4-dimethyl sterols related to 5α-cholestane series as well as for their C-3-oxo derivatives. The influence of pyridine, relative to CDCl3, on methyl group chemical shifts was discussed. The technique utilizing pyridine-induced solvent shifts in PMR spectroscopy was found useful in characterizing the individual classes of sterols. |
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