Web14 mrt. 2014 · Two new guaiazulene-based analogues, ochracenoids A (1) and B (2), along with four known analogues (3–6), were isolated from the gorgonian Anthogorgia ochracea collected from the South China Sea. The planar structures of the new compounds were elucidated by comprehensive spectroscopic data. The absolute configuration of 1 was … WebThe net shielding increments of the proximate proton of methane, plotted against its Cartesian coordinates relative to the center of the carbon-oxygen double bond, led to the …

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Web31 jan. 2024 · The molecular weight of OA has been determined as 456.7 g/mol. OA is a hard-hydrophobic compound, practically insoluble in water (1.748 µg/L), which is usually … Web1 mei 1980 · The methine-proton (H 3) in a 3,4 unit showed a broad peak centered around 1.5 ppm in C 6 D 6. The overlapping of this signal with the methyl-proton signals at 1.73 … pechan prism

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Web5 aug. 2006 · The 1 H-NMR spectrum of decarboxydihydrocitrinin (4) (Table 1) showed three methyl signals, two methine protons, one pair of methylene protons, and an aromatic … Webexhibited six singlet methyl signals, an olefin proton signal at d H 5.47 (brs), one anomeric proton signal at d H 5.38 (d, J 7.7Hz), and one methine proton signal at d H 4.64 (brs). Alkaline hydrolysis of 1 performed with 3% KOH yielded a prosaopgenin and glucose by confirmed HPTLC. The data of anomeric carbon signal at d C 95.7 and anomeric ... Web5 apr. 2024 · A molecule with exchangeable protons or those that form hydrogen bonds (such as -OH and -NH) will often appear as broad peaks in a proton spectrum. Not only … pechanga arena box office