Papers by Virgilio D Ebajo Jr.
Chemical investigation of the dichloromethane extracts of the propolis collected from bee (Tetrag... more Chemical investigation of the dichloromethane extracts of the propolis collected from bee (Tetragonula biroi Friese) hives in San Roque, Sorsogon, Philippines afforded propolin A (1), propolin E (2), propolin H (3), glyasperin A (4), squalene, a mixture of lupeol, α-amyrin and β-amyrin, and another mixture of urs-12-en-3-one, olean-12-en-3-one and lup-12-en-3-one. The structures of 2–4 were elucidated by extensive 1D and 2D (COSY, HSQC, and HMBC) NMR spectroscopy, while 1 was identified by comparison of its NMR data with 2.
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Chemical investigations of the dichloromethane extract of the twigs of Eucalyptus deglupta (Blume... more Chemical investigations of the dichloromethane extract of the twigs of Eucalyptus deglupta (Blume) led to the isolation of 5-hydroxy-7,4'-dimethoxy-6,8-dimethylflavone (1). The structure of 1 was elucidated by extensive 1D and 2D NMR spectroscopy.
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Chemical investigations of the dichloromethane extracts of the leaves of Eucalyptus deglupta (Blu... more Chemical investigations of the dichloromethane extracts of the leaves of Eucalyptus deglupta (Blume) led to the isolation of nerolidol (1), ursolic acid (2), oleanolic acid (3), and squalene (4), while the twigs yielded 2-4. The structures of 1-4 were identified by comparison of their 1H and/or 13C NMR data with those reported in the literature.
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Chemical investigations of the dichloromethane extracts of Shorea negrosensis (Foxw.) led to the ... more Chemical investigations of the dichloromethane extracts of Shorea negrosensis (Foxw.) led to the isolation of friedelin (1), 3β-friedelinol (2), oleanolic acid (3), ursolic acid (4), squalene (5) and chlorophyll a (6) from the leaves, while the twigs yielded 1, 3 and 4. The structures of 1-6 were identified by comparison of their 1H and/or 13C NMR data with those reported in the literature.
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Chemical investigations of the dichloromethane extracts of Pipturus arborescens afforded ursolic ... more Chemical investigations of the dichloromethane extracts of Pipturus arborescens afforded ursolic acid (1), oleanolic acid (2), friedelin (3), β-sitosterol (4), and stigmasterol (5) from the twigs; while the leaves yielded 4, 5, squalene (6), chlorophyll a (7), and polyprenol (8). The structures of 1-8 were identified by comparison of their 1H and/or 13C NMR data with those reported in the literature.
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Chemical investigation of the dichloromethane extracts of Strongylodon macrobotrys led to the iso... more Chemical investigation of the dichloromethane extracts of Strongylodon macrobotrys led to the isolation of taraxerone (1), stigmasterol (2), β-sitosterol (3), and triglycerides (4) from the stems; 2, 3, and β-stigmasteryl 3-O-β-D-glucopyranoside (5) from the flowers; and polyprenol (6), lutein (7), squalene (8) and chlorophyll a (9) from the leaves. The structures of these compounds were identified by comparison of their 13C NMR data with those reported in the literature.
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Chemical investigation of the dichloromethane extract of the air-dried roots of Hoya mindorensis ... more Chemical investigation of the dichloromethane extract of the air-dried roots of Hoya mindorensis Schlechter afforded lupenone (1) and lupeol (2). The leaves yielded 2, squalene (3) and β-sitosterol (4), while the stems afforded betulin (5). The structures of 1-5 were identified by comparison of their 1H and/or 13C NMR data with those reported in literature.
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Papers by Virgilio D Ebajo Jr.