Enantioselectivities up...The review summarizes recent work in the field of hydrogenation reactions catalyzed by transition metal complexes in aqueous media. Oehme war der Sohn eines Arztes. The reactions are usually enhanced by … cmsmasters responsive html5 website template. Günther Oehme A series of pyridines substituted in the 2-position were synthesized by cobalt (I)-catalyzed cotrimerization of alkynes and nitriles. The resulting monodentate chiral aminophosphinites have been tested in the rhodium-catalyzed asymmetric hydrogenation of methyl α-acetamidocinnamate and methyl α-acetamidoacrylate. cod=1,5-cyclooctadiene.Enantiomeric excesses of up to 99 % could be obtained in the synthesis of the biologically interesting acylated α-aminophosphinic acids 1 (R1=Me, Ph; R2=H, Me, Et; R3=H, F, iPr) by asymmetric hydrogenation with rhodium complex catalysts and subsequent hydrolysis [Eq. Performing the reduction in water, both the activity and the enantioselectivity are enhanced significantly in the presence of surfactants. Unser Campus liegt … In compari...A number of polymerizable ionic amphiphiles has been polymerized in water at various concentrations above their critical micelle concentration (cmc). In case of the asymmetric hydrogenation activity and enantioselectivity were enhanced in water due to the addition of surfactants. . In case of the asymmetric hydrogenation activity and enantioselectivity were enhanced in water due to the addition of surfactants. Zusammen mit seinen Schülern konnte er nachweisen, "dass die Schilddrüse unter dem Einfluß der Hypophyse steht. 0341/97-36056. For the ideal wavelength range (350-500 nm), lamps as well as sunlight can be used. The products (1–6, 11) were characterized as phosphinoethyl-sulfonatoalkyl-thioethers with an unexpected high water solubility and with defined P/S ratios from 1/2, 1/4 and 1/6. : 09176 9805-0 Fax. 04103 Leipzig. 20 90584 Allersberg Tel. These ligands, and especially the BPPM analog, in association with rhodium complexes, exhibited high enantioselectivities, up to 93%, and activities in the reduction of various unsaturated substrates although they...The selectivity of photochemical synthesis of pyridines based on alkynes (e.g., ethyne, propyne, butyne, dimethylbutyne) and nitriles (e.g., benzo-, aceto-, trimethoxybenzonitrile, n-butylcyanoacetate, tert-butylcyanide) with cobalt(I) complexes ([YCo(cod)]; Y=η5-cyclopentadienyl, η5-indenyl, η5-tetraphenylcyclopentadienyl, η5-acetylcyclopentadieny...Several kinds of micelle forming amphiphiles were tested in the asymmetric hydrogenation of the prochiral dialkyl 1-benzamido-2-phenyl-ethenephosphonates in aqueous media. Beruflicher Werdegang. PROPRAPHOS-Rh-catalysts from readily available (S)- and (R)-Propranolol proved to be suitable in the homogenous reaction affording an enantiomeric excess of 87?? cod=1,5-cyclooctadiene.Enantiomeric excesses of up to 99 % could be obtained in the synthesis of the biologically interesting acylated α-aminophosphinic acids 1 (R1=Me, Ph; R2=H, Me, Et; R3=H, F, iPr) by asymmetric hydrogenation with rhodium complex catalysts and subsequent hydrolysis [Eq. Oligomeric and polymeric species are formed upon photochemical initiation. We gladly accepted the invitation to give a keynote presentation titled "Multiscale modelling of liver… 1 gradually eliminates hydrogen to give 3,4-dimethyl-6-perfluoroheptylpyridine (2). The reaction conditions are very mild. cod=1,5-Cyclooctadien.3,4-Dimethyl-6-perfluoroheptyl-2,5-dihydropyridine (1) is obtained by hetero Diels-Alder reaction between 2,3-dimethyl-1,3-butadiene and perfluorooctanonitrile at 50°C and pressures of 1 and 1500 bar, respectively. Working at room temperature and in organic solvents such as...A general synthesis of chiral 4,5-dihydro-3H-dinaphthophosphepines 1a–g is described. ?92% with high rate. ?-aminophosphonic acid derivatives are efficiently synthesized by asymmetric hydrogenation of the prochiral N-acyl-??,??-dehydroaminophosphonates.
ArtNet: More works by Oehme. The reactions are usually enhanced by light. Die von den Tensiden gebildeten Assoziate variieren in ihrer Morphologie je nach Temperatur u...Efficient and stable chiral monodentate phosphine ligands can be used in the ruthenium-catalyzed enantioselective hydrogenation of β-ketoesters (see scheme). A high sensitivity of the optical induction to achiral modifiers is observed for the new precatalyst 2.The synthesis of new types of soluble and insoluble amphiphilic systems is described, being polysoaps, crosslinked polysoaps, an amphiphilised ion exchanger, and ion exchangers loaded with ionic surfactants.
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