Journal ArticleDOI
Intramolecular electrostatic stabilization of an SN1 transition state
V. P. Vitullo,N. R. Grossman +1 more
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This article is published in Journal of Organic Chemistry.The article was published on 1973-01-01. It has received 49 citations till now. The article focuses on the topics: Intramolecular force.read more
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Dicerandrols, new antibiotic and cytotoxic dimers produced by the fungus Phomopsis longicolla isolated from an endangered mint.
Melissa M. Wagenaar,Jon Clardy +1 more
TL;DR: Bioassay-guided fractionation of the organic extract from a culture of Phomopsis longicolla led to the isolation of dicerandrols A, B, and C, which are new yellow antibiotic and cytotoxic compounds as 2,2'-dimeric tetrahydroxanthones.
Journal ArticleDOI
Isolation, structure determination, and biological activity of a novel alkaloid, perophoramidine, from the Philippine ascidian Perophora namei.
TL;DR: Dehalogenation of perophoramidine by ammonium formate catalyzed transfer hydrogenation confirmed the type and number of halogen atoms present in 1.
Journal ArticleDOI
Halipeptins A and B: two novel potent anti-inflammatory cyclic depsipeptides from the Vanuatu marine sponge Haliclona species.
Antonio Randazzo,Giuseppe Bifulco,Clelia Giannini,Mariarosaria Bucci,Cécile Debitus,Giuseppe Cirino,Luigi Gomez-Paloma +6 more
TL;DR: Two new metabolites, named halipeptins A and B, have been isolated from the marine sponge Haliclona sp.
Journal ArticleDOI
Megastigmane and phenolic components from Laurus nobilis L. leaves and their inhibitory effects on nitric oxide production.
TL;DR: The effect of isolated compounds on nitric oxide production in lipopolysaccharide-activated murine macrophages were examined and the structures and relative stereochemistry have been elucidated by one- and two-dimensional nuclear magnetic resonance experiments and by chemical derivatization.
Journal ArticleDOI
The Kapakahines, Cyclic Peptides from the Marine Sponge Cribrochalina olemda
Bryan K. S. Yeung,Yoichi Nakao,Robin B. Kinnel,John R. Carney,Wesley Y. Yoshida,Paul J. Scheuer,Michelle Kelly-Borges +6 more
TL;DR: Four cyclic peptides, kapakahines A-D, were isolated from the marine sponge Cribrochalina olemda and their structures including complete stereochemistry were elucidated by spectral analysis and chemical degradation.
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First observation of electroluminescence at the p-type semiconductor/electrolyte interface caused by electron injection: energetics of adsorbed hydrogen at the p-GaAs electrode
Kohei Uosaki,Hideaki Kita +1 more