Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Guenther Oehme"'
Autor:
Guenther Oehme, Eckhard Paetzold, Ute Schmidt, Ingrid Grassert, I. Iovel, Torsten Dwars, Hans Fuhrmann
Publikováno v:
Kinetics and Catalysis. 44:766-777
Micelle-forming amphiphiles can promote catalyzed reactions in aqueous media. An example is the asymmetric hydrogenation of amino acid precursors. In comparison to the most common solvent methanol, the hydrogenation in water leads to a decrease of ac
Autor:
Axel Monsees, Kathrin Junge, Matthias Beller, Guenther Oehme, Uwe Dingerdissen, Thomas Riermeier
Publikováno v:
Tetrahedron Letters. 43:4977-4980
A general synthesis of chiral 4,5-dihydro-3H-dinaphthophosphepines 1a–g is described. The resulting ligands represent a new class of monodentate chiral phosphines. First applications of 1a–g in the rhodium-catalyzed asymmetric hydrogenation of un
Autor:
Torsten Dwars, Guenther Oehme
Publikováno v:
Advanced Synthesis & Catalyis. 344:239-260
The review summarizes recent work in the field of hydrogenation reactions catalyzed by transition metal complexes in aqueous media. This development was stimulated by the availability of water-soluble ligands and facilitated the recycling of the cata
Publikováno v:
Chemistry of Heterocyclic Compounds. 36:40-46
A series of ethyl(phenyl) 6-amino-2,3,6-trideoxy-α-D-glucopyranosides (amino=piperidino (Pip), pyrrolidino (Pyr), azetidino (Az), Bu2N) have been prepared from tri-O-acetyl-D-glucal to obtain catalysts for asymmetric synthesis and the starting compo
Publikováno v:
Tetrahedron: Asymmetry. 9:4193-4202
Several kinds of micelle forming amphiphiles were tested in the asymmetric hydrogenation of the prochiral dialkyl 1-benzamido-2-phenyl-ethenephosphonates in aqueous media. The chiral catalytic system [Rh(cod) 2 ]BF 4 /BPPM or amphiphilized PPM proved
Publikováno v:
Journal für Praktische Chemie/Chemiker-Zeitung. 339:38-43
Commercially available ω-thioalkane sodium sulfonates could easily be added to mono-, bi- and trivinylphosphines. The two-phase system became homogeneous by stirring. The products (1–6, 11) were characterized as phosphinoethyl-sulfonatoalkyl-thioe
Publikováno v:
ChemInform. 28
Commercially available ω-thioalkane sodium sulfonates could easily be added to mono-, bi- and trivinylphosphines. The two-phase system became homogeneous by stirring. The products (1–6, 11) were characterized as phosphinoethyl-sulfonatoalkyl-thioe
Autor:
Karlheinz Drauz, Christine Fischer, Guenther Oehme, Ute Schmidt, Ingrid Grassert, Torsten Dwars, Rhett Kempe, Roland Froehlich
Publikováno v:
ChemInform. 30
Publikováno v:
ChemInform. 30
Several kinds of micelle forming amphiphiles were tested in the asymmetric hydrogenation of the prochiral dialkyl 1-benzamido-2-phenyl-ethenephosphonates in aqueous media. The chiral catalytic system [Rh(cod) 2 ]BF 4 /BPPM or amphiphilized PPM proved
Publikováno v:
ChemInform. 30