| 1 | Author
| T. Hashimoto, M. Tori, Y. Asakawa, E. Wollenweber | Requires cookie* | | Title
| Synthesis of Two Allergenic Constituents of Propolis and Poplar Bud Excretion  | | | Abstract
| The prenyl ester and the phenylethyl ester of caffeic acid, formed in the bud excretion of poplar species, were shown recently to be the major contact allergens in bee-glue. An unambiguous synthesis of these compounds, based on the reaction of caffeic acid with l-bromo-3-methyl-2-butene and with ß-bromoethylbenzene, respectively, is reported. The synthetic products confirm the previously described structures of the natural products and allow further testing of their allergenic properties. | | |
Reference
| Z. Naturforsch. 43c, 470—472 (1988); received January 25 1988 | | |
Published
| 1988 | | |
Keywords
| Propolis, Contact Allergens, Prenyl Caffeate, Phenylethyl Caffeate, Synthesis | | |
Similar Items
| Find | | DEBUG INFO
| | | | TEI-XML for
| default:Reihe_C/43/ZNC-1988-43c-0470_n.pdf | | | Identifier
| ZNC-1988-43c-0470_n | | | Volume
| 43 | |
3 | Author
| Denis Barron, RagaiK. Ibrahim | Requires cookie* | | Title
| Synthesis of Flavonoid Sulfates. III. Synthesis of 3',4'-ortho Disulfates Using Sulfur Trioxide-trimethylamine Complex, and of 3'-SuIfates Using Aryl Sulfatase  | | | Abstract
| A number of flavonoid 3',4'-disulfates were synthesized from the corresponding 4'-sulfate esters, using sulfur trioxide-trimethylamine complex. Desulfation of the sulfate esters using aryl sulfatase demonstrated that the rate of hydrolysis of the 3'-sulfate group was slower than either the 7-or 4' groups, thus allowing the specific synthesis of flavonol 3,3'-disulfates. The effects of ori/io-disulfation on the L1 C NMR spectra of flavonoids, and the regative FAB-MS spectra of di-and trisulfated flavonoids are discussed. | | |
Reference
| Z. Naturforsch. 43c, 631—635 (1988); received March 18 1988 | | |
Published
| 1988 | | |
Keywords
| Flavonoid Sulfate Esters, Synthesis, 13 C NMR, FAB-MS, UV Spectra | | |
Similar Items
| Find | | DEBUG INFO
| | | | TEI-XML for
| default:Reihe_C/43/ZNC-1988-43c-0631.pdf | | | Identifier
| ZNC-1988-43c-0631 | | | Volume
| 43 | |
|