Abstract
Phytochemical research of two Tolpis species, T. webbii and T. sp., led to the isolation of three new compounds: 2,4'-dihydroxy-4-methoxybenzophenone (1) and the triterpenes 21 alpha, 22 alpha-epoxy-20 alpha-hydroxy-20(30)-dihydrotaraxasterol (2) and 3beta-hydroxytaraxaster-20-en-30-oic acid (3) together with 16 known compounds. The structures of the new compounds were elucidated by means of extensive IR, NMR, MS and X-ray analysis and by comparison of data reported in the literature.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Asteraceae / chemistry*
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Benzophenones / chemistry
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Benzophenones / isolation & purification*
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Molecular Structure
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Plant Components, Aerial
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Plant Extracts / chemistry*
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Triterpenes / chemistry
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Triterpenes / isolation & purification*
Substances
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2,4'-dihydroxy-4-methoxybenzophenone
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21 alpha, 22 alpha-epoxy-20 alpha-hydroxy-20(30)-dihydrotaraxasterol
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3beta-hydroxytaraxaster-20-en-30-oic acid
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Benzophenones
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Plant Extracts
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Triterpenes