Results 201 to 210 of about 1,764 (217)

ChemInform Abstract: DEPSIDONE SYNTHESIS. IV. CALOPLOICIN

Chemischer Informationsdienst, 1976
AbstractNach Beschreibung eines ‐ wegen zu geringer Ausbeute bei einer Ullmann‐Reaktion ‐ erfolglosen Reaktionsweges zur Titelverbindung (Vb) wird diese wie folgt dargestellt: Rhizinonsäure (I) wird mit Surfurylchlorid in 5‐Stellung chloriert (73% Ausbeute), dibenzyliert und sofort die Benzylestergruppe zu (II) hydrolysiert (91%).
MELVYN V. SARGENT, PAUL VOGEL
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Structure of the lichen depsidone gangaleoidin

Journal of the Chemical Society, Perkin Transactions 1, 1975
As a result of degradative, spectroscopic, and synthetic evidence the structure of the lichen depsidone gangaleoidin is revised to methyl 2,4-dichloro-3-hydroxy-8-methoxy-1,6-dimethyl-11-oxo-11H-dibenzo [b,e][1,4]dioxepin-7-carboxylate. Gangaleoidin was degraded to methyl 3-(2-methoxycarbonyl-5-methoxy-3-methylphenoxy)-4,6-dimethoxy-2-methylbenzoate ...
Melvyn V. Sargent, Paul Vogel, John A. Elix   +2 more
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Depsidone synthesis. VII. Vicanicin and norvicanicin

Australian Journal of Chemistry, 1976
The lichen Psoroma sphinctrinurn (Mont.) Nyl. occurs in two or more chemical strains. 2,7-Dichloro- 3 - hydroxy -8-methoxy- 1,4,6,9 - tetramethyl - 11H- dibenzo[b,e][l,4]dioxepin- 11-one (vicanicin) (2), a known depsidone, is a metabolite of one strain, and 2,7-dichloro-3,8-dihydroxy-1,4,6,9-tetramethyl-1lH-dibenzo[b,e][1,4]dioxepin-11-one ...
MV Sargent, P Vogel, JA Elix, BA Ferguson   +3 more
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Colensionsäure, ein neues depsidon aus stereocaulon colensoi

Phytochemistry, 1970
Zusammenfassung Stereocaulon colensoi Bab. enthalt Atranorin, d -Mannit, d -Arabit, Tetrahydroxyfettsauren und Colensoinsaure (I), ein neues Depsidon.
Cecil H Fox, Erich Klein, Siegfried Huneck   +2 more
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Depsidone synthesis. Part 15. New metabolites of the lichen Buellia canescens(Dicks.) De Not: novel phthalide catabolites of depsidones

Journal of the Chemical Society, Perkin Transactions 1, 1981
The isolation, from the lichen Buellia canescens(Dicks.) De Not., and structural determination of the new depsidones 2,7,9-trichloro-3-hydroxy-8-methoxy-1,6-dimethyldibenzo[b,e][1,4]dioxepin-11-one (dechlorodiploicin)(1) and its methyl ether dechloro-O-methyldiploicin (9), together with the novel phthalides 4-chloro-7-(3,5-dichloro-4,6-dimethoxy-2 ...
Tony Sala, Melvyn V. Sargent, John A. Elix   +2 more
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ChemInform Abstract: DEPSIDONE SYNTHESIS. PART 18. DIHYDRONIDULIN

Chemischer Informationsdienst, 1981
AbstractCycloaddition des Ketoesters (II) an das Olefin (I) gibt das Oxocyclohexenylcarboxylat (III), dessen Umsetzung mit 1 Moläquiv. Brom unter Aromatisierung zu (IVa) verläuft.
P. F. FINLAY‐JONES, T. SALA, M. V. SARGENT   +2 more
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Depsidone synthesis. Part 20. Lecideoidin and dechlorolecideoidin

Journal of the Chemical Society, Perkin Transactions 1, 1981
The synthesis of methyl 2,9-dichloro-3,8-dihydroxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylate (lecideoidin)(1) and methyl 2-chloro-3,8-dihydroxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]-dioxepin-7-carboxylate (dechlorolecideoidin)(2) by oxidation of benzophenones and subsequent steps is described.
Peter M. McEwen, Melvyn V. Sargent
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ChemInform Abstract: DEPSIDONE SYNTHESIS. PART 19. SOME β‐ORCINOL DEPSIDONES

Chemischer Informationsdienst, 1981
T. SALA, M. V. SARGENT
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depsidone, n.

2023
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Depside, Depsidone

1977
Walter Karrer, Emile Cherbuliez, Conrad Hans Eugster   +2 more
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