1,721,108 research outputs found
87. G. Aliotta, M. Della Greca, P. Monaco, G. Pinto, A. Pollio e L. Previtera (1996) Potential Allelochemicals from aquatic plants: their action on microalgae
No full textPolyprenols from the leaves of quercus ilex infected by microsphaera aphitoides
No full textC45, C50, C55 and C60 polyprenols with usual isoprenoid unsaturation were isolated from Q. ilex leaves infected by fungus M. alphitoides. The most abundant C55 prenol was found to be identical with already known ficaprenol-11. The assignment of all the signals in its 13C-nmr spectrum confirmed the alignment of the Z and E internal residues. A structure-based naming system for unsaturated polyprenols was suggested. © 1983, American Chemical Society. All rights reserved
Isoprenoids from the leaves of Quercus suber
No full textBesides seventeen already known lupane and oleanane triterpenes, epibetulinic aldehyde has been isolated from the leaves of Quercus súber. In addition, 9-, 10-, 11-, and 12-prenol were present in specimens infected by the fungus Microsphaera alphitoides. © 1984, American Chemical Society. All rights reserved
A linear diterpene diolfrom Lemna minor
No full textFour known isoprenoids were isolated from Lemna minor besides a novel diterpene which was attributed the structure (4R)-4-hydroxyisophytol by spectroscopic studies and chemical correlation. © 1984
Cyclopropylcarbinyl compounds from homoallylic iodides
No full textA simple synthesis of cyclopropylcarbinyl compounds based on the reaction of homoallylic iodides with silver salts in anhydrous medium is described. © 1984
Further oxygenated fatty acids from Lemna minor
No full textIn a re-investigation of the aquatic plant Lemna minor, two novel cyclopen-tanoid Cl6 fatty acids, 6a and 7a, have been isolated and characterized as the corresponding methyl esters on the basis of their physical and chemical features. A biogenetic pathway similar to that of the prostaglandins is suggested for these compounds. © 1987, American Chemical Society. All rights reserved
Fatty acid composition in Lemna minor-characterization of a novel hydroxy C16 acid
No full textThe triacylglycerol fraction of Lemna minor afforded mainly 16:1 and 16:3 fatty acids and a novel hydroxy acid (10R)-hydroxyhexadeca-7Z,11E,13Z-trienoic. The free fatty acid fraction was composed of a similarly distributed mixture. © 1983
Three biologically active phenylpropanoid glucosides from Myriophyllum verticillatum
No full textThree novel phenylpropanoid glucosides have been isolated from a methanolic extract of Myriophyllum verticillatum and their structures defined by spectroscopic methods and chemical degradations. The biological activity of these compounds on the cyanobacterium Synechococcus leopoliensis has been investigated. © 1992
A steroid from Pistia stratiotes
No full textA novel stigmastane, 11α-hydroxy-24S-ethyl-5α-cholest-22-en-3,6-dione, has been isolated from the aquatic plant Pistia stratiotes. The structure determination was accomplished by spectroscopic methods. A revision of the NMR assignments of an analogous cholestane sterol is also reported. © 1991
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