ZfN: Search Results

1	Author	WolfJürgen Richter	Requires cookie*
	Title	Asymmetrische Synthesen durch Substitution: Diastereomere Arsinite aus homochiral substituierten Arsoniten Asymmetrie Synthesis via Substitution: D iastereom eric Arsinites from Homochirally Substituted Arsonites
	Abstract	Conceptually novel access to chiral arsinites is provided by reacting phenyl-0,0-dim enthyl-arsonite (1) with bulky nucleophiles e. g. terr-butyl-lithium or wo-propyl-lithium to yield the arsinites 3 and 4. The asymmetric induction determined by GC and NM R is 50% and 30% d.e. A small nucleophile effects double substitution.
	Reference	Z. Naturforsch. 50b, 339—341 (1995); eingegangen am 15. September 1994
	Published	1995
	Keywords	Asymmetrie Induction, Chiral Arsonites, Arsinites
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0339.pdf
	Identifier	ZNB-1995-50b-0339
	Volume	50

2	Author	Henri Brunner, A.F M Mokhlesur Rahman	Requires cookie*
	Title	Asymmetrische Katalysen, 13 [1] Chelat-Liganden und ihre Rhodium-Komplexe mit seitlichen Asymmetriezentren und ihre Anwendung in der enantioselektiven Katalyse Asymmetric Catalyses. 13 [1] Chelate Ligands and their Rhodium Complexes with Lateral Asymmetrie Centers and their Use in Enantioselective Catalysis
	Abstract	The chelate ligands 1-3 with lateral asymmetric centers at the nitrogen atoms were prepared and characterized. In the Rh complexes 4 and 5 the asymmetric centers directly interact with those coordination positions where during enantioselective catalysis pro-chiral substrates are converted into optically active products. The compounds 4 and 5, as well as the in situ catalysts [Rh(COD)Cl]2/2 were used in the asymmetric hydrogenation of a-N[acetamino]cinnamic acid and in the asymmetric hydrosilylation of acetophenone with diphenylsilane. The low optical inductions obtained result from the catalyst loosing its chiral information during catalysis due to racemization or fragmentation.
	Reference	Z. Naturforsch. 38b, 1332—1338 (1983); eingegangen am 16. Mai 1983
	Published	1983
	Keywords	Optical Activity, Asymmetrie Induction, Enantioselective Catalysis
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/38/ZNB-1983-38b-1332.pdf
	Identifier	ZNB-1983-38b-1332
	Volume	38