Zobrazeno 1 - 10
of 611
pro vyhledávání: '"Hans Georg von Schnering"'
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 103:399-403
Since triphenylphloroglucinol (1) has been described with widely differing properties, the correct structure has been substantiated by X-ray analysis. On oxidation of 1 the dimer 5 is formed irreversibly by coupling between two phenyl groups. All thr
Autor:
Hans Georg von Schnering, Anke Zürn
Publikováno v:
Zeitschrift für anorganische und allgemeine Chemie. 634:2761-2764
It is shown that Periodic Nodal Surfaces, PNS, give a general and easy to use tool to analyze and characterize mesoporous solids. The comparison of PNS ( Symmetry) with different MCM-48 micrographs indicates two different possible structure types, bo
Publikováno v:
Zeitschrift für anorganische und allgemeine Chemie. 634:2156-2160
The positions of the mobile cations in the superionic conductors of the cubic α-RbAg4I5 type follow a 3D infinite hyperbolic layer, which is moulded by the symmetry governed Periodic Nodal Surface.
Publikováno v:
Zeitschrift für anorganische und allgemeine Chemie. 633:1147-1153
It is shown how the Periodic Nodal Surface PNS D*&Y** separates perfectly the two partial structures of the cubic cP124 type. Condensed metal-centered [M@E20] pentagonal dodecahedra of covalently bonded E atoms form a 3-connected net. This partial st
Publikováno v:
Solid State Sciences. 9:459-464
The synthesis and crystal structure of the red transparent lithium boride Li6B18(Li2O)x (0
Publikováno v:
Zeitschrift für anorganische und allgemeine Chemie. 632:1281-1286
Vibrational spectra of the compounds M4E4 (M = K, Rb, Cs; E = Ge, Sn) and of β-Na4Sn4 with the cluster anions [E4]4− were analysed based on the point group of isolated tetrahedranide units. The lower individual symmetry of the anions in the real s
Autor:
Ernst-Ulrich Würthwein, Helmut Quast, Sven Aldenkortt, Hans Georg von Schnering, Karl Peters, Peter Schäfer, Bernd Freudenreich, Eva-Maria Peters
Publikováno v:
Liebigs Annalen. 1996:87-98
Treatment of the 3,3-dimethyl-2-iminoaziridine 7 with hydrogen bromide yields similar amounts of the α-bromo amidine 10a · HBr and the α,β-unsaturated amidinium bromide 11. Ring opening reactions of the 3-tert-butyl-2-iminoaziridines 8 by nucleop
Autor:
Helmut Quast, Hans Georg von Schnering, Karl Peters, Christian Becker, M. Witzel, Eva-Maria Peters
Publikováno v:
Liebigs Annalen. 1996:985-997
Several 2,6-substituted barbaralanes, viz. 1d–g, have been synthesised from Meerwein's diketone (2). Treatment of dinitrile 3 with hydrochloric acid in boiling methanol followed by hydrolysis of the intermediate Pinner salt yields the dimethyl dica
Autor:
Werner Tochtermann, Hans Georg von Schnering, Karl Peters, Eva-Maria Peters, Anne‐Katrin Mattauch, M. Kasch
Publikováno v:
Liebigs Annalen. 1996:317-322
The resolution of the earlier reported racemic bridged methyl deoxyfuranosides 1 and 3 was achieved via fractional crystallization of the ephedrinium salts 2 or by column chromatography of the camphanoates 5. The absolute configurations of 1 and 3 we
Autor:
Helmut Schlemper, Heinz Wilhelm Rotter, M. Fletschinger, Christian Hasenfratz, Guo-Zen Ji, Hans Georg von Schnering, Leonhard Walz, Dietmar Putzas, Carol Ottaway, A. V. Satish, Thomas Breuer, Joachim Boele, Jürgen Willaredt, Karl Peters, Reinhard Schwesinger, Frederick G. Bordwell, Eva-Maria Peters, Tim Dambacher, Hans Fritz
Publikováno v:
Liebigs Annalen. 1996:1055-1081
The syntheses and properties of novel, extremely strong uncharged polyaminophosphazene bases up to a high level of steric hindrance are described. Most of the systems were readily prepared in up to molar quantities and conveniently recovered from the