Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Josef Heinzer"'
Publikováno v:
Liebigs Annalen. 1995:1193-1215
Silyl nitronates of 2,2,2-trifluoronitroethane and of 1,1,1-trifluoro-2-nitropropane [SiMe3, SiMe2(tBu), SiMe2CMe2-CHME2] were prepared and their reactions studied. – The TBDMS nitronate of the nitroethane is present at the (E) and (Z) isomer (2.3:
Publikováno v:
ChemInform. 26
Silyl nitronates of 2,2,2-trifluoronitroethane and of 1,1,1-trifluoro-2-nitropropane [SiMe3, SiMe2(tBu), SiMe2CMe2-CHME2] were prepared and their reactions studied. – The TBDMS nitronate of the nitroethane is present at the (E) and (Z) isomer (2.3:
Publikováno v:
Helvetica Chimica Acta. 68:1848-1862
Using the ‘permutation of indices’ method proposed by Kaplan and Fraenkel, we could formulate the density-matrix equations required to fit the temperature-dependent 13C-NMR spectra observed with the title compounds. For 6Li13CHBr2 (1) and 6Li13CH
Publikováno v:
Chemische Berichte. 117:23-41
Zwei Reihen aroylsubstituierter Derivate (RCO-η6-C6H5)(η6-C6H6 Cr und (RCO-η6-C6H5)2Cr wurden dargestellt: R = C6H5 (6, 9); R = 4-H3CC6H4 (7, 10); R = 4-FC6H4 (8, 11); R = 4-F3CC6H4 (12, 14); R = 4-NC5H4(pyridyl) (13, 15). Diese wurden mit Kalium
Autor:
Josef Heinzer, Jean F. M. Oth
Publikováno v:
Helvetica Chimica Acta. 64:258-278
Iterative least-squares lineshape fitting of 1H-decoupled 13C-DNMR. spectra is advantageously used for the investigation of symmetrical or asymmetrical intramolecular (two-structure) exchange processes. The least-squares procedure adopted allows the
Autor:
Josef Heinzer
Publikováno v:
Molecular Physics. 22:167-177
A general line shape equation for intramolecular exchange among many sites has been derived by means of the Liouville density matrix theory and adapted to fast computer calculations. Applications of the computer programme ESREXN, which is based on th
Publikováno v:
Helvetica Chimica Acta. 53:95-103
The ESR.-spectrum of the radical anion of 1,6-imino-[10]annulene (II) has been recorded. Its hyperfine structure reflects the reduced symmetry (Cs) of the molecule, as compared with that (C2v) of 1,6-methano- and 1,6-oxido-[10]annulenes (I and III, r
Publikováno v:
Helvetica Chimica Acta. 56:1845-1852
ESR. data are reported for the radical anions (II⊖ to VI⊖) of five alkyl substituted 6a-thiathiophthenes. Rates and activation parameters for the inversion of the 3,4-trimethylene chain in IV⊖, V⊖ and VI⊖ have been obtained by means of an i
Publikováno v:
Helvetica Chimica Acta. 53:103-116
The ESR.-spectra of the radical anion of syn-1, 6; 8, 13-bis-oxido-[14]annulene have been recorded. The hyperfine structure of the electrolytically generated anion (solvent: N, N-dimethylformamide; gegenion: Et4N⊕) is that of an unassociated specie
Publikováno v:
Chemischer Informationsdienst. 4
ESR. data are reported for the radical anions (II⊖ to VI⊖) of five alkyl substituted 6a-thiathiophthenes. Rates and activation parameters for the inversion of the 3,4-trimethylene chain in IV⊖, V⊖ and VI⊖ have been obtained by means of an i