Asymmetrische katalysen XXXVI. Neue mehrzähnige liganden mit dem (S)-(α)-(2-Pyridyl)ethylrest; Rh-komplexe und enantioselektive hydrosilylierungen
作者:Henri Brumner、Heinrich Fisch
DOI:10.1016/0022-328x(87)85169-0
日期:1987.11
Starting from (S)-(−)-α-(2-pyridyl)ethylamine, 11 new multidentate ligands were prepared and characterized. Reaction with [Rh(cod)Cl]2 yielded the (cyclooctadiene)(imine)-RhI complexes (I–VII). The isolated complexes and the in-situ systems [Rh(cod)Cl]2/1–11 were used as enantioselective catalysts in the hydrosilylation of acetophenone with diphenylsilane. The resulting α-phenylethanol was found to
Asymmetrische katalysen XXXVII. Komplexe mit freien donorgruppen als kokatalysatoren für enantioselektive hydrosilylierungen
作者:Henri Brunner、Heinrich Fisch
DOI:10.1016/0022-328x(87)85170-7
日期:1987.11
Structural Characterization of Zinc(II)/Cobalt(II) Complexes of Chiral <i>N</i>-(Anthracen-9-yl)methyl-<i>N</i>,<i>N</i>-bis(2-picolyl)amine and Evaluation of DNA Photocleavage Activity
bis(2-picolyl)amine on the DNA photocleavage activity of metal complexes. The structures of ZnII and CoII complexes in APPE were analyzed via X-ray crystallography and fluorometric titration. APPE formed metal complexes with a 1 : 1 stoichiometry in both the crystalline and solution states. Fluorometric titration was used to show that the ZnII and CoII association constants of these complexes (log Kas)
我们设计并合成了手性配体N- (蒽-9-基甲基)-1-(吡啶-2-基) -N- (吡啶-2-基甲基)乙胺(APPE) DNA光裂解剂,以研究手性的影响双(2-吡啶甲基)胺对金属配合物DNA光裂解活性的影响。通过X 射线晶体学和荧光滴定分析了 APPE 中Zn II和 Co II配合物的结构。APPE 在结晶状态和溶液状态下形成化学计量比为 1:1 的金属配合物。使用荧光滴定法显示这些配合物的 Zn II和Co II缔合常数 (log Kas) 分别为 4.95 和 5.39。发现合成的复合物在 370 nm 照射时可切割 pUC19 质粒 DNA。Zn II配合物的 DNA 光裂解活性高于 Co II配合物。甲基连接碳的绝对构型并不影响 DNA 裂解活性,不幸的是,发现不含甲基的非手性 APPE 衍生物 (ABPM) 比 APPE 更有效地进行 DNA 光裂解。造成这种情况的原因之一可能是