Minor Phenolic Constituents of Grevillea robusta and Hakea saligna

1980 ◽  
Vol 35 (3-4) ◽  
pp. 344-345 ◽  
Author(s):  
Manju Varma ◽  
R. S. Varma ◽  
M. R. Parthasarathy
Keyword(s):  
Grevillea Robusta ◽  
Spectral Evidence ◽  
Phenolic Constituents

Abstract Three hitherto unknown phenolic constituents epilyoni-resinol, its glucoside and rhamnocitrin-3-O-rutinoside have been isolated from G. robusta wood and leaves besides kaempferol-3-O-rutinoside whereas 2,6-dimethoxybenzo-quinone, lyoniresinol and its rhamnoside are obtained from H. saligna wood. Their structures were assigned on the basis of chemical and spectral evidence.

Phenolic Constituents of Grevillea robusta (Proteaceae). The Structure of Robustol, a Novel Macrocyclic Phenol

1973 ◽  
Vol 26 (10) ◽  
pp. 2257 ◽  
Author(s):  
JR Cannon ◽  
PW Chow ◽  
MW Fuller ◽  
BH Hamilton ◽  
BW Metcalf ◽  
...  
Keyword(s):  
Grevillea Robusta ◽  
Physical Methods ◽  
Phenolic Constituents ◽  
Trimethyl Ether

Rutin, 2,5-dihydroxycinnamic acid (5), methyl 4-hydroxycinnamate (6), and a mixture of novel macrocyclic phenols have been isolated from the leaves of Grevillea robusta A. Cunn. The major macrocyclic phenol, robustol, has been shown to have the structure (8) by the application of physical methods and by degradation of robustol trimethyl ether (9) to give 3-[14?-(3?,5?-dimethoxyphenyl)tetradec-1?-yl]-5-methoxy-phenol (34). Three of the minor macrocyclic phenols have been assigned tentative structures (11), (12), and (13).

Phenolic constituents from Grevillea robusta

2000 ◽  
Vol 53 (1) ◽  
pp. 149-154 ◽  
Author(s):  
Amany S. Ahmed ◽  
Norio Nakamura ◽  
Meselhy R. Meselhy ◽  
Makhboul A. Makhboul ◽  
Nasr El-Emary ◽  
...  
Keyword(s):  
Grevillea Robusta ◽  
Phenolic Constituents

New phenolic constituents or Grevillea robusta wood

1976 ◽  
Vol 15 (9) ◽  
pp. 1418-1419 ◽  
Author(s):  
R.S. Varma ◽  
Ms Manju ◽  
M.R. Parthasarathy
Keyword(s):  
Grevillea Robusta ◽  
Phenolic Constituents

Phenolic Constituents from the Wood of Morus australis with Cytotoxic Activity

2008 ◽  
Vol 63 (1-2) ◽  
pp. 35-39 ◽  
Author(s):  
◽  
Yana M. Syah ◽  
Lia D. Juliawaty ◽  
Sjamsul A. Achmad ◽  
Euis H. Hakim ◽  
...  
Keyword(s):  
Cytotoxic Activity ◽  
Mass Spectra ◽  
Methanol Extract ◽  
Cytotoxic Effects ◽  
Spectral Evidence ◽  
Phenolic Constituents ◽  
Murine Leukemia

A new methylated flavonol, 5,7,2 ′,4 ′-tetrahydroxy-3-methoxyflavone (1), had been isolated from the methanol extract of the wood of Morus australis, along with nine known compounds, kuwanon C (2), morusin (3), morachalcone A (4), oxyresveratrol (5), 4 ′-(2-methyl-2-buten- 4-yl)oxyresveratrol (6), moracins M (7) and C (8), alboctalol (9), and macrourin B (10). The structures of these compounds were determined based on spectral evidence, including UV, IR, NMR, and mass spectra. Cytotoxic properties of compounds 1 →10 were evaluated against murine leukemia P-388 cells. The prenylated stilbene 6 and 2-arylbenzofuran 8, and morusin (3) were found to have strong cytotoxic effects with IC50 values of 6.9, 8.7, and 10.1 μM, respectively.

Phenolic constituents of Crithmum maritimum and their radical scavenging activity

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
S Ngom ◽  
L Breant ◽  
C Antheaume ◽  
C Minker ◽  
A Leick ◽  
...  
Keyword(s):  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Phenolic Constituents

α-Mangostin, a major xanthone from Garcinia mangostana and other phenolic constituents, with potent antibacterial and analgesic activities

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
AA El-Gamal ◽  
OA Basudan ◽  
AJ Al-Rehaily ◽  
MH Assaf ◽  
FM Abd El Halim ◽  
...  
Keyword(s):  
Garcinia Mangostana ◽  
Phenolic Constituents ◽  
Analgesic Activities

Phenolic constituents isolated from the flower of Carex kobomugi

2019 ◽  
Author(s):  
N Abe ◽  
S Ayabe ◽  
M Haba ◽  
T Tanaka ◽  
M Oyama
Keyword(s):  
Carex Kobomugi ◽  
Phenolic Constituents

Comparison Among Five Eucalyptus Species Based on Their Leaf Contents of Some Primary and Secondary Metabolites

2019 ◽  
Vol 20 (7) ◽  
pp. 573-587
Author(s):  
Alyaa Nasr ◽  
Tehmina Saleem Khan ◽  
Shi-Ping Huang ◽  
Bin Wen ◽  
Jian-Wen Shao ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Protocatechuic Acid ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Renewable Resource ◽  
Total Phenolic ◽  
Eucalyptus Species ◽  
Primary And Secondary Metabolites ◽  
Acetone Water ◽  
Phenolic Constituents

Background: Eucalyptus belongs to the Myrtaceae family. It is the most planted hardwood forest crop worldwide, representing a global renewable resource of fiber, pharmaceuticals and energy. Objective: To compare the five species, E. maidenii, E. robusta, E. citriodora, E. tereticornis and E. camaldulensis, seeking for the richest source of nutrients and pharmaceuticals. Methodology: Eucalyptus samples were subjected to some chemical determinations for both primary and secondary metabolites to verify their nutritional and pharmaceutical importance related to different extracts. GC-MS analysis was applied to detect the presence of some individual phenolic constituents in their leaves. Results: E. robusta recorded the maximum contents of carbohydrates (40.07%) and protein (31.91%). While E. camaldulensis contained the highest contents of total phenolic compounds (46.56 mg/g), tannins (40.01 mg/g) and antioxidant activities assayed by the phosphomolybednum method (57.60 mg/g), followed by E. citridora. However, E. tereticornis exhibited the highest reducing power ability (151.23 mg/g). The GC-MS highlighted 20 phenolic constituents and antioxidants which varied in their abundance in Eucalyptus leaves, 8 individual phenolics (hydroquinone, hesperitin, pyrogallol, resorcinol, protocatechuic acid, naringenin, chlorogenic acid and catechin) were maximally recorded with E. camaldulensis and secondly, with E. citridora in case of at least 5 components. Nevertheless, gallic and quinic acids were more abundant in the leaves of E. tereticornis, which may explain its high corresponding reducing powers. Conclusion: Acetone-water combination has enhanced phenolics extraction from Eucalyptus tissues. This is the first report aiming to compare between the aforementioned Eucalyptus species highlighting either their nutritional or medicinal importance.

8-Acyl-7-phenylbicyclo[2.2.2]-2,6-diones by rearrangement of 3-acyloxy-5-(2-phenylethenyl)-2-cyclohexen-1-ones. 1H and 13C NMR spectral evidence of their structure

1990 ◽  
Vol 55 (5) ◽  
pp. 1208-1215 ◽  
Author(s):  
Pavel Hrnčiar ◽  
Tibor Liptay ◽  
Ján Šraga
Keyword(s):  
Double Bond ◽  
Spectral Data ◽  
13C Nmr ◽  
1H And 13C Nmr ◽  
Spectral Evidence ◽  
C Nmr

3-Acyloxy-5-(2-phenylethenyl)-2-cyclohexen-1-ones II were prepared by O-acylation of 5-(2-phenylethenyl)-1,3-cycloxanedione (I). Treatment of II with AlCl3 resulted in rearrangement of the acyl group to the double bond of the phenylethenyl grouping followed by cyclization to 8-acyl-7-phenylbicyclo[2.2.2]octane-2,6-diones III. Their structure was evidenced by analysis of the 1H and 13C NMR spectral data.

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