Struktur der Secalonsäuren A und B [1]

Franck, Burchard; Gottschalk, E. M.; Ohnsorge, U.; Baumann, Gert

doi:10.1002/ange.19640761020

Cited by 9 publications

(20 citation statements)

References 3 publications

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“…[4] Wir haben durch Anwendung einer Domino-Oxa-Michael-Aldolkondensation [5] einen flexiblen Zugang zu Tetrahydroxanthenon-Mycotoxinen entwickelt. Hierbei gelang uns die erste Totalsynthese des Sekundärmetaboliten Diversonol (2) …”

Section: Professor Burchard Franck Gewidmetunclassified

Die Totalsynthese des Pilzmetaboliten Diversonol

2005

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Section: Professor Burchard Franck Gewidmetunclassified

Die Totalsynthese des Pilzmetaboliten Diversonol

2005

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“…Measurements of the circular dichroism of gem-nitrohalogenosteroids at -188 " C support the rule given. From the results it follows that in unhindered nitrocyclohexanes the following conformations are energentically most favored : -SELECTED ABSTRACTS 4,4'-bond [2,3]. Three further similar, pale yellow pigments, which we denote as secalonic acid C, ergochrysin A, and ergochrysin B, have been isolated as pure crystalline individuals.…”

Section: G Snatzke Bonn (Germany)mentioning

confidence: 94%

“…Three further similar, pale yellow pigments, which we denote as secalonic acid C, ergochrysin A, and ergochrysin B, have been isolated as pure crystalline individuals. Their analyses, infrared, ultraviolet, and NMR spectra, and specific rotations show them to be u n s y m m et r i c a l dimerization products of (I), (2) The anthraquinonecarboxylic acids endocrocin (4) and clavorubin, isolated in collaboration with T. Reschke [4], form a second group of ergot pigments. The structure of 3methyl-l,5,6,8-tetrahydroxyanthraquinone-2-carboxylic acid (5) has now been determined for clavorubin, and confirmed by synthesis.…”

Section: G Snatzke Bonn (Germany)mentioning

confidence: 99%

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Verdazyls and Related Nitrogen‐Containing Free Radicals

Kühn

1964

Angew. Chem. Int. Ed. Engl.

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acids, and b) to differentiate between primary, secondary, and tertiary monohydric alcohols and for the quantitative analysis of binary and ternary mixtures of these alcohols. The three types of monobasic acids can be distinguished by the multiplet structure and intensity ratio of the a-CH2 and a-CH proton resonance signals, provided that these do not overlap with the P-proton multiplets. The intensities of the signals are determined relative to that of the carboxylic proton resonance signal. For quantitative analysis of binary mixtures, the intensity ratio can be used. For the analysis of alcohols, the preparation of the sample constitutes an important part of the procedure, for it must ensure that any exchange of the hydroxyl protons comes to a standstill [7]. The three types of alcohol then show differences in the multiplicity of the hydroxyl signal and in its chemical shift. This depends on the solvent and the temperature. A second procedure, based on comparison of peak heights gives results of similar absolute accuracy (is %) in suitable cases.Relations between Structure and Rate Constants for the Dissociation and Recombination of Carboxylic Acids

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“…The formation of some anthraquinones [Nakano, Komiya and Shibata (1971) 44 . The modified bianthraquinones discussed in the present lecture are correlated biogenetically with the modified bixanthones.…”

Section: Studies On the Metabolites Of Fungi And Lichensmentioning

confidence: 99%

Some recent studies on the metabolites of fungi and lichens

Shibata¹

1973

Pure and Applied Chemistry

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Various anthraquinonoid colouring matters grouped into (a) monomeric anthraquinones, (b) bianthraquinones and (c) modified bianthraquinones were isolated from Penicillium islandicum, P. rugulosum, and other fungi. The unusual cagelike structures of hepatotoxic luteoskyrin, (-)rubroskyrin, ( + )rugulosin and their analogues are elucidated. The absolute stereochemical structures of these fungal colouring matters have been established on the basis of the x-ray crystallographical analysis of a bromination product of (+)tetrahydrorugulosin. The photoreaction of (-)luteoskyrin is discussed in elucidatirrg the structure of the product, lumiluteoskyrin. In addition, (-)flavoskyrin, isolated from a strain of Penicillium islandicum, has now been proved to be a modified bianthraquinone. An unusual dimerization reaction of the dihydroanthraquinones which were synthesized as model compounds for flavoskyrin is also discussed. ( + )Rugulosin, skyrin, some fungal modified bixanthones and their related compounds have recently been found in certain Iichens. The biogenetical correlation between the metabolites offungi and lichens is discussed in the light ofstudies on the secondary metabolism oflichen mycobionts.

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Struktur der Secalonsäuren A und B [1]

Cited by 9 publications

References 3 publications

Die Totalsynthese des Pilzmetaboliten Diversonol

Die Totalsynthese des Pilzmetaboliten Diversonol

Verdazyls and Related Nitrogen‐Containing Free Radicals

Some recent studies on the metabolites of fungi and lichens

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