(N-trifluoromethanesulfonyl)sulfimides of linear and cyclic organosilicon sulfides
作者:E. N. Suslova、A. I. Albanov、B. A. Shainyan
DOI:10.1134/s1070363210030126
日期:2010.3
reactivity of N-trifyl-substituted sulfimides with respect to electrophilic reagents and increased their stability. Mass spectra of isomeric cyclic organosilicon N-trifluoromethanesulfonyl-substituted sulfimides VII, X, their acyclic analog III, and the product of the decomposition of the latter at the Si-C(S) bond IV were studied. The mechanism of formation of sulfimides in nonaqueous media is discussed
Molecular Structure and Pseudorotation in 3,3-Dimethyl-3-silatetrahydrothiophene from a Joint Gas-Phase Electron Diffraction and Ab Initio Molecular Orbital Study.
作者:Konstantin B. Borisenko、Svein Samdal、Elena N. Suslova、Victor A. Sipachev、Igor F. Shishkov、Lev V. Vilkov、Teófilo Rojo
DOI:10.3891/acta.chem.scand.52-0975
日期:——
The molecular structure of 3,3-dimethyl-3-silatetrahydrothiophene has been reinvestigated utilizing a joint electron diffraction/ab initio approach. Two local minima with T-1(5) and T-4(5) conformations of the ring could not be distinguished on the basis of electron-diffraction data alone. However, the model with the five-membered ring having a distorted T-1(5) form was in agreement with the ab initio calculations and had a slightly lower R-factor than the T-4(5) form. Molecular mechanics calculations suggest that the conformation is determined mainly by angular and torsional strains in the molecule, with the angular strain predominating. The barrier to pseudorotation was estimated to be 9.6 kJ mol(-1) from the HF/6-311++G** ab initio calculations including correction for the zero-point vibrational energy. Differences between C-S, Si-C bond lengths and between exocyclic C-Si-C angles obtained from the MP2(FC)/6-311++G** ab initio calculations were used as constraints in the electron diffraction structure analysis. Two different methods were used to calculate the shrinkage corrections from the force field scaled to fit the experimental frequencies. The following values (I, bond lengths and angle(alpha) angles with total errors) were found for the main parameters in the molecule: r(S-C)(mean) 1.829 +/- 0.005 Angstrom; r(Si-C)(mean) 1.883 +/- 0.006 Angstrom; r(C-C) 1.541 +/- 0.007 Angstrom; r(CH)(mean) 1.112 +/- 0.003 Angstrom; angle(C-S-C)(ring) 98.6 +/- 0.8 degrees; angle (C-Si-C)(ring) 97.7 +/- 0.6 degrees; ring puckering amplitude, q(0), 10.7 +/- 0.6 degrees; pseudorotation phase angle, f, 168.1 +/- 4.4 degrees (corresponds to a distorted T-1(5) form of the ring).
VORONKOV, M. G.;KIRPICHENKO, S. V.;SUSLOVA, E. N.;KEIKO, V. V.;ALBANOV, A+, J. ORGANOMET. CHEM., 1983, 243, N 3, 271-279
作者:VORONKOV, M. G.、KIRPICHENKO, S. V.、SUSLOVA, E. N.、KEIKO, V. V.、ALBANOV, A+