The structures of five cyclic diketones isolated from coffee
β Scribed by M.A. Gianturco; A.S. Giammarino; R.G. Pitcher
- Publisher
- Elsevier Science
- Year
- 1963
- Tongue
- French
- Weight
- 933 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0040-4020
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π SIMILAR VOLUMES
The solid-phase "C CPMAS NMR spectra of the crystallime h e r s from lo-, 12and 14-membered cyclic a-diketones were found to be in full accord with the symmeirical tricyclic 2,5-dihydroxycyclohexane-l,4dione structures previously proposed on the basis of molecular formulae and inβ¬rared spectroscopy.
## Abstract Five new gangliosides β acanthaganglioside A (1), B (2), C (3), D (4) and E (5) β were purified from the waterβsoluble lipid fraction of the chloroform/methanol extract of the starfish __Acanthaster planci.__ Based on chemical and spectroscopic data, the structures of 1β5 were elucidate