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By G. W. Bealde, A. J. Haagen-Smit, T. G. Halsall, F. T. Haxo, E. R. H. Jones, R. Michel, J. Roche, K. Slotta, A. R. Thompson, E. O. P. Thompson, R. Tschesche, F. L. Warren (auth.), L. Zechmeister (eds.)

ISBN-10: 3709171660

ISBN-13: 9783709171660

ISBN-10: 3709171687

ISBN-13: 9783709171684

Substances belonging to this team of natural compounds are wi,lely disbursed in Nature, being present in crops, either greater and reduce fungi and, upto the current time, in a single animal resource, sheep wool-fat. For an extended­ time no actual differentiation was once attainable among the tetra- and penta­ cyclic triterpenes and the sterols. Then the 2 latter grew to become disting­ uishable via their selenium. ·dehydrogenation items, i. e. , picene and naphthalene derivatives from the pentacyclic triterpenes and DIELS' hydrocarbon from the sterols. it really is now obvious that these compounds yielding predominantly I: 2: 8-trimethylphenanthrene on dehydro­ genation symbolize another classification, and this estate is considered usual of the tetracyclic triterpenes. the crowd includes either C and C 30 3l compounds and, even if the latter fall open air RUZICKA'S strict definition of triterpenes (I42), it kind of feels fascinating to allow this deviation. participants with thirty-two carbon atoms might be came upon in the end. In a such a lot· priceless account of the triterpenes written in I949, JEGER. (II3) used to be in a position to summarize all that used to be identified concerning the tetra­ cyclic workforce in a really small compass. many of the paintings mentioned within the current article has been released over the last 5 years and in that point the constructions of a few twenty compounds were elucidated. of exceptional significance is the revelation of shut structural relation­ ships tQ the steroids, and the presence of C and C side-chains, skeletally eight nine exact with these of ldl cholesterol and ergosterol.

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Extra info for Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progres dans la Chimie des Substances Organiques Naturelŀes

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B. and E. C. SHERRARD: Dehydroperillic Acid. an Acid from Western Red Cedar (ThuJa Plicala DON). J. Amer. Chem. 3813 (1933). 7. ANDERSON. A. • Jr. and J. A. NELSON; Electrophilic Substitution of Azulene. J. Amer. Chern. Soc. 72. 3824 (1950). 8. - - Azuiene. I. An Improved Synthesis. J. Amer. Chern. Soc. 232 (1951). 1. A. J. HAAGE:-I-S:lIIT: '). -\. G.. Jr.. J. A. :\ELSON and J. J. TAZUMA: Azulene. III. Electrophilic Substitution. J. Amer. Chern. Soc. 75. 4980 (1953). 10. A:-;OERSO:-l. A. • Jr. and J.

Comm. 18. 527 (1953) [Chern. Abstr. 48. 12707 (1954) J. 203. ~ORM, F. and J. POKORNY: On Terpenes. XLVII. Synthesis of 1,7-Dimethylazulene. Chern. Listy 47. 63 (1953)· 204. SORM. , M. STREIBL. V. JARoLIM. L. NOVOTNY. L. DOLE}S and V. HEROUT: On Terpenes. LVIII. 8-Tetramethyl-c)tcloundecane (Humulane). Proof of the Eleven-membered Ring in Humulene. Collect. Czech. Chern. Communs. 19. 570 (1954). 205. ~ - ~ -- ~ Synthesis of I: 1 :4:8-Tetramethylcyclo-undecane (Hummane). Proof of the Eleven-membered Ring in Humulene.

Liebigs Ann. Chern. 579, 47 (1953)· 167. : Untersuchungen iiber asymmetrische Synthesen. I. 'Ober den sterischen Verlauf der Reaktion von a:-Ketosaure-estern optisch aktiver Alkohole mit Grignard'schen Verbindungen. Helv. Chim. Acta 36, 308 (1953). 168. PRELOG, V. und H. L. MEIER: Untersuchungen iiber asymmetrische Synthesen. II. 'Ober den sterischen Verlauf der Umsetzung von Phenylglyoxylsaureestern 'des Menthols, Neomenthols, Borneols und Isoborneols mit Methylmagnesiumjodid. Helv. Chim. Acta 36, 320 (1953).

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Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progres dans la Chimie des Substances Organiques Naturelŀes by G. W. Bealde, A. J. Haagen-Smit, T. G. Halsall, F. T. Haxo, E. R. H. Jones, R. Michel, J. Roche, K. Slotta, A. R. Thompson, E. O. P. Thompson, R. Tschesche, F. L. Warren (auth.), L. Zechmeister (eds.)


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