| 書目名稱 | Fortschritte der Chemie Organischer Naturstoffe/Progress in the Chemistry of Organic Natural Product | | 編輯 | G. W. Bealde,A. J. Haagen-Smit,F. L. Warren,L. Zec | | 視頻video | http://file.papertrans.cn/347/346446/346446.mp4 | | 叢書名稱 | Fortschritte der Chemie organischer Naturstoffe‘ Progress in the Chemistry of Organic Natural Produc | | 圖書封面 |  | | 描述 | Substances belonging to this group of organic compounds are wi,lely distributed in Nature, being found in plants, both higher and lower fungi and, upto the present time, in one animal source, sheep wool-fat. For a long- time no real differentiation was possible between the tetra- and penta- cyclic triterpenes and the sterols. Then the two latter became disting- uishable by their selenium. ·dehydrogenation products, i. e. , picene and naphthalene derivatives from the pentacyclic triterpenes and DIELS‘ hydrocarbon from the sterols. It is now apparent that those compounds yielding predominantly I: 2: 8-trimethylphenanthrene on dehydro- genation represent yet another class, and this property is regarded as typical of the tetracyclic triterpenes. The group contains both C and C 30 3l compounds and, although the latter fall outside RUZICKA‘S strict definition of triterpenes (I42), it seems desirable to permit this deviation. Members with thirty-two carbon atoms may well be discovered in due course. In a most· valuable account of the triterpenes written in I949, JEGER. (II3) was able to summarize all that was known about the tetra- cyclic group in a very small compass. Most of the work di | | 出版日期 | Book 1955 | | 關(guān)鍵詞 | chemistry; natural product | | 版次 | 1 | | doi | https://doi.org/10.1007/978-3-7091-7166-0 | | isbn_softcover | 978-3-7091-7168-4 | | isbn_ebook | 978-3-7091-7166-0Series ISSN 0071-7886 | | issn_series | 0071-7886 | | copyright | Wien Springer-Verlag 1955 |
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