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Gololobov Yu. G. Galkin V. I. Petrovskii P. V. Linchenko O. A. Zueva E. M. Mubarakova L. G. Cherkasov R. A. Schmutzler R. Ernst L. Jones P. G. Freytag M. 《Russian Chemical Bulletin》2003,52(9):1920-1927
Studies by 1H NMR spectroscopy and X-ray diffraction analysis revealed hindered rotation of the aromatic substituent about the CAr—N bond in ortho-substituted (except for o-fluorine-substituted) phosphorus-containing carbamates. The energy barriers to rotation (G
c
) and coalescence temperatures (T
c) determined by the coalescence method increase with increasing volume of the ortho substituent. Conformations resulting from rotation of the ortho-substituted aryl group about the CAr—N bond were analyzed by quantum-chemical methods, potential curves were constructed, and differences between the conformational energies and the heights of rotation barriers were estimated. The theoretical rotation barriers change in parallel with the experimental values of G
c
; however, the theoretical values are much smaller in magnitude. 相似文献
2.
Journal of Analytical Chemistry - A method is proposed for the determination of sultones in the anionic surfactant sodium α-olefin sulfonate (AOS Na) and products based on this surfactant. The... 相似文献
3.
Chevela V. V. Semenov V. E. Sal'nikov Yu. I. Shamov G. A. Bochkareva S. A. Mubarakova L. G. 《Russian Journal of General Chemistry》2001,71(5):671-674
Formation of heteronuclear erbium(III), thulium(III), and iron(III) d- and dl-tartrates was studied by proton magnetic relaxation, pH-metry, and paramagnetic birefringence in combination with mathematical simulation. The paramagnetic birefringence constants mP of the complexes were calculated. 相似文献
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