03 Fakultät Chemie
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Item Open Access Eine einfache Synthese von N-Carboxy-α,β-didehydro-α-aminosäure-anhydriden (4-Alkyliden-2,5-oxazolidindionen) (Aminosäuren ; 10)(1988) Effenberger, Franz; Niesert, Claus-Peter; Kühlwein, Jürgen; Ziegler, Thomasα-Azidocarboxylic acids 1 react with phosgene in the presence of catalytic amounts of sodium perrhenate in dimethoxyethane at 85°C to give N-carboxy-α,β-didehydroamino acid anhydrides (4-alkylidene-2.5-oxazolidinediones) 2 in good yields.Item Open Access Donor-acceptor substituted polyenes : orientation in mono- and multilayers(1992) Bubeck, Christoph; Effenberger, Franz; Häußling, Lukas; Neher, Dieter; Niesert, Claus-Peter; Ringsdorf, HelmutLarge molecules containing different chemical units whose interactions within the molecule result in new macroscopically observable effects, have become increasingly important.The organization of molecules of this type in ordered structures leads to functional molecular materials.Their use in molecular electronics requires that the units exhibit specific electronic properties. Recently, we reported on the intramolecular energy transfer through terminally substituted conjugated polyenes. An intramolecular electron transfer within donor-acceptor substituted polyenes can be achieved by introducing suitable terminal groups.Item Open Access Herstellung konjugierter Polyene mit Anthryl- und N-Methylpyridinium-Endgruppen(1992) Effenberger, Franz; Niesert, Claus-PeterThe synthesis of terminally donor-acceptor substituted polyenes from the respective aldehydes via Horner reactions is described. As donor group the 9-anthryl and as acceptor moiety the 4-(N-methyl)pyridinium residue were chosen. A bicyclo[2.2.2]octane unit was incorporated into the chain to interrupt the conjugation. The separation and characterization of the mixtures of Z/E- isomers obtained in the syntheses was possible.