Sesquiterpene glycosides and triterpenes from the chloroform extract of Pittosporum pentandrum (Blanco) Merrill
The choroform extract of Pittosporum pentandrum (Blanco) Merrill yielded a mixture of four sesquiterpene glycosides and another mixture of two triterpenes by gravity column chromatography (dry) packing. The structures of these constituents were elucidated by IR, 1H-NMR, 13C-NMR, DEPT, 1H-1H COSY spr...
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| Format: | text |
| Language: | English |
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Animo Repository
1995
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| Online Access: | https://animorepository.dlsu.edu.ph/etd_masteral/1713 |
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| Institution: | De La Salle University |
| Language: | English |
| Summary: | The choroform extract of Pittosporum pentandrum (Blanco) Merrill yielded a mixture of four sesquiterpene glycosides and another mixture of two triterpenes by gravity column chromatography (dry) packing. The structures of these constituents were elucidated by IR, 1H-NMR, 13C-NMR, DEPT, 1H-1H COSY sprectroscopy and mass spectrometry. On the basis of a formula index search, the proposed structures of the compounds are novel. The relative stereochemistry of the sesquiterpene glycosides were determined by a combination of coupling constants analyses and NOESY. The sesquiterpene glycosides were acetylated, and the derivatized products were analyzed by 1H-NMR to confirm the proposed structures. |
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