TY - JOUR A1 - Mederow, Gabriele T1 - [Kap.] Makromolekulare Stoffe Y1 - 1997 ER - TY - JOUR A1 - Dietrich, Volkmar T1 - [Kap.] Ermittlung der Zusammensetzung und Struktur von Stoffen Y1 - 1991 ER - TY - JOUR A1 - Dietrich, Volkmar T1 - [Kap.] Carbonsäuren, Ester-Fette, Seifen und Waschmittel Y1 - 1999 ER - TY - JOUR A1 - Dietrich, Volkmar T1 - [Kap.] Alkansäuren, Ester-Fette, Seifen und Waschmittel Y1 - 2000 ER - TY - JOUR A1 - Kosman, Admiʾel T1 - ?של מי הנקמה JF - אלכסון T2 - Whose revenge is this? Y1 - 2024 UR - https://alaxon.co.il/article/%d7%a9%d7%9c-%d7%9e%d7%99-%d7%94%d7%a0%d7%a7%d7%9e%d7%94/ ER - TY - JOUR A1 - Mackenbach, Werner T1 - ? De la identidad a la sociabilidad? representationes de la convivencia en las literaturas centroamericanas y caribeñas Y1 - 2011 SN - 978-3-938944-54-7 ER - TY - JOUR A1 - Weiß, Norman T1 - 9. Forum Globale Fragen des Auswärtigen Amtes: „Fest entschlossen, unsere Kräfte zu vereinen ... " - die Vereinten Nationen als Motor globaler Strukturpolitik <2003, Berlin> / [Tagungsbericht] JF - MenschenRechtsMagazin : MRM ; Informationen, Meinungen, Analysen N2 - Tagungsbericht: Auswärtiges Amt: „Fest entschlossen, unsere Kräfte zu vereinen . . . " - die Vereinten Nationenals Motor globaler Strukturpolitik <2003, Berlin> / (9. Forum Globale Fragen des Auswärtigen Amtes)am 11. und 12. Dezember 2003. Y1 - 2004 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-55725 SN - 1434-2820 VL - 9 IS - 1 SP - 106 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Zehm, Daniel A1 - Fudickar, Werner A1 - Hans, Melanie A1 - Schilde, Uwe A1 - Kelling, Alexandra A1 - Linker, Torsten T1 - 9,10-Diarylanthracenes as molecular switches : syntheses, properties, isomerisations and their reactions with singlet oxygen N2 - A series of 9,10-diarylanthracenes with various substituents at the ortho positions have been synthesised by palladium-catalysed cross-coupling reactions. Such compounds exhibit interesting physical properties and can be applied as molecular switches. Despite the high steric demand of the substituents, products were formed in moderate-to-good yields. In some cases, microwave conditions further improved yields. Bis-coupling afforded two isomers (syn and anti) that do not interconvert at room temperature. These products were easily separated and their relative stereochemistries were unequivocally assigned by NMR spectroscopy and X-ray analysis. The syn and anti isomers exhibit different physical properties (e.g., melting points and solubilities) and interconversion by rotation around the aryl-aryl axis commences at <100 °C for fluoro-substituted diarylanthracenes and at >300 °C for alkyl- or alkoxy-substituted diarylanthracenes. The reactions with singlet oxygen were studied separately and revealed different reactivities and reaction pathways. The yields and reactivities depend on the size and electronic nature of the substituents. The anti isomers form the same 9,10-endoperoxides as the syn species, occasionally accompanied by unexpected 1,4-endoperoxides as byproducts. Thermolysis of the endoperoxides exclusively yielded the syn isomers. The interesting rotation around the aryl-aryl axis allows the application of 9,10-diarylanthracenes as molecular switches, which are triggered by light and air under mild conditions. Finally, the oxygenation and thermolysis sequence provides a simple, synthetic access to a single stereoisomer (syn) from an unselective coupling step. Y1 - 2008 SN - 0947-6539 ER - TY - JOUR A1 - Schultze, Christiane A1 - Foß, Stefan A1 - Schmidt, Bernd T1 - 8-Prenylflavanones through microwave promoted tandem claisen rearrangement/6-endo-trig cyclization and cross metathesis JF - European journal of organic chemistry N2 - Prenylated flavanones were obtained from ortho-allyloxy chalcones through a one-pot sequence of Claisen rearrangement and 6-endo-trig cyclization, followed by olefin cross metathesis of the intermediate allyl flavanones with 2-methyl-2-butene. The synthetic utility of this route is illustrated for the synthesis of several naturally occurring prenyl flavanones. KW - tandem reactions KW - arenes KW - oxygen heterocycles KW - microwave chemistry KW - rearrangement Y1 - 2020 U6 - https://doi.org/10.1002/ejoc.202001378 SN - 1434-193X SN - 1099-0690 VL - 2020 IS - 47 SP - 7373 EP - 7384 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Yenesew, Abiy A1 - Twinomuhwezi, Hannington A1 - Kiremire, Bernard T. A1 - Mbugua, Martin N. A1 - Gitu, Peter M. A1 - Heydenreich, Matthias A1 - Peter, Martin G. T1 - 8-Methoxyneorautenol and radical scavenging flavonoids from Erythrina abyssinica N2 - A new pterocarpan (named 8-methoxyneorautenol) was isolated from the acetone ext. of the root bark of Erythrina abyssinica. In addn., the known isoflavonoid derivs. eryvarin L, erycristagallin and shinpterocarpin were identified for the first time from the roots of this plant. The structures were detd. on the basis of spectroscopic evidence. The new compd. showed selective antimicrobial activity against Trichophyton mentagrophytes. The acetone ext. of the root bark of E. abyssinica showed radical scavenging activity towards 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). The pterocarpenes, 3-hydroxy-9-methoxy-10-(3,3-dimethylallyl)pterocarpene and erycristagallin, were the most active constituents of the roots of this plant and showing dose-dependent activities similar to that of the std. quercetin. [on SciFinder (R)] Y1 - 2009 UR - http://www.ajol.info/journal_index.php?jid=120&ab=bcse SN - 1011-3924 ER -