Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Lothar Göbel"'
Autor:
Markus Heubes, and Bernd Schöner, Michael Ochse, O. Schupp, Matthias Breuning, Lothar Göbel, Gerhard Bringmann
Publikováno v:
The Journal of Organic Chemistry. 65:722-728
Configurationally unstable biaryl lactones of type (M)-1 ⇌ (P)-1 and ring-opened 2-acyl-2‘-hydroxy biaryl compounds of type (M)-4 ⇌ (P)-4 are versatile precursors for the atroposelective preparation of axially chiral biaryls. The activation bar
Autor:
Christian L. J. Ewers, Matthias Breuning, Karl Peters, Lothar Göbel, Gerhard Bringmann, Heike Endress, Stefan Tasler, Eva-Maria Peters
Publikováno v:
Scopus-Elsevier
Axially chiral biaryls with diastereomeric ratios of up to 95:5 are synthesized by highly atropo-selective cleavage of configurationally unstable, lactone-bridged biaryls with chiral metalated 1-arylethlamines (see scheme). This methodology permits o
Publikováno v:
Journal of Organometallic Chemistry. 544:7-13
Ground state structures and relative energies of the regioisomers of 1,3-dialkyl-benzo[b]naphtho[1,2-d]pyranone chromiumtricarbonyl complexes 2 and 4 (R = Me and rBu) have been calculated by means of DF methods. The thermodynamically most stable regi
Publikováno v:
Inorganica Chimica Acta. 222:255-260
The regioselective complexation of the unsymmetric lactone-type bridged biaryl 1 with a chromium tricarbon- ylfragment is reported. By temperature dependent NMR of the resulting complex 3, the activation barrier of the helix inversion was determined.
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 203:265-268
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 203:265-268
The title adduct is a by-product of the synthesis of benzo-naphthopyrans. It crystallizes from dichloromethane/petroleum ether monoclinically in the space group P21/n with a = 1695.8(4), b = 2133.7(6), c = 935.3(2) pm, and β = 101.03(2)°.
Autor:
Hans Georg von Schnering, Lothar Göbel, Karl Peters, Gerhard Bringmann, Thomas Hartung, O. Schupp
Publikováno v:
Liebigs Annalen der Chemie. 1992:769-775
A simple two-step synthesis of a series of ether-type bridged biaryls 3, as favorable models for studies of helimerization processes, is described. Starting from the known corresponding lactones 1, a variety of differently substituted representatives
Publikováno v:
Zeitschrift für Kristallographie-New Crystal Structures, Vol 213, Iss 1-4, Pp 357-358 (1998)
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 209:524-525
The title compound was obtained in a one-step reaction under Strecker-conditions. starting from the commercially available compounds phthaldialdehyde, (S)-1-phenylethylamine, and sodium cyanide. It crystallizes from ethanol/water monoclinically in th