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84962335564
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note
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Although the term oxathietane implies a S-O bond, there is controversy about the nature of this bond (see ref 7 and the references cited therein), and a weakly bonded situation has been suggested. Our computational results are consistent with such interpretation, and we prefer the term S-O interaction.
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12
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0010922186
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Frisch, M. J.; Trucks, G. W.; Schlegel, H. B.; Gill, P. M. W.; Johnson, B. G.; Robb, M. A.; Cheeseman, J. E.; Keith, T.; Petersson, G. A.; Montgomery, J. A.; Raghavachari, K.; Al-Laham, M. A.; Zakrzewski, V. G.; J. V. Ortiz, J. B. F.; Cioslowski, J.; Stefanov, B. B.; Nanayakkara, A.; Challacombe, M.; Peng, C. Y.; Ayala, P. Y.; Chen, W.; Wong, M. W.; Andres, J. L.; Replogle, E. S.; Gomperts, R.; Martin, R. L.; Fox, D. J.; Binkley, J. S.; Defrees, D. J.; Baker, J.; Stewart, J. P.; Head-Gordon, M.; Gonzalez, C.; Pople, J. A. Gaussian94; Gaussian, Inc.: Pittsburgh, PA, 1995.
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Keith, T.8
Petersson, G.A.9
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Raghavachari, K.11
Al-Laham, M.A.12
Zakrzewski, V.G.13
J.V. Ortiz, J.B.F.14
Cioslowski, J.15
Stefanov, B.B.16
Nanayakkara, A.17
Challacombe, M.18
Peng, C.Y.19
Ayala, P.Y.20
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Wong, M.W.22
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Replogle, E.S.24
Gomperts, R.25
Martin, R.L.26
Fox, D.J.27
Binkley, J.S.28
Defrees, D.J.29
Baker, J.30
Stewart, J.P.31
Head-Gordon, M.32
Gonzalez, C.33
Pople, J.A.34
more..
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18
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84946893847
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Miertus, S.; Scrocco, E.; Tomasi, J. Chem. Phys. 1981, 55, 117-129.
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Shimizu, T.; Matsuhisa, A.; Kamigata, N.; Ikuta, S. J. Chem. Soc., Perkin Trans. 2 1995, 1805-1808.
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Shimizu, T.1
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33748610822
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Aggarwal, V. K.; Schade, S.; Taylor, B. J. Chem. Soc., Perkin Trans. 1 1997, 2811-2813.
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21
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84962362676
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note
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2.
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22
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0000777274
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23
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84962348792
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note
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The S-O distance in 4, 2.2 Å at the B3LYP/6-31+G* level, is relatively large for a covalent bond. Furthermore, the electron density between S and O is much lower than in the covalent bonds in 4, as revealed by examination of electron density isosurfaces.
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24
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84962348801
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note
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The necessary stationary points of the model reaction were redetermined at this lower level of theory for the purpose of concistency.
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25
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0000554243
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Aggarwal, V. K.; Abdel-Rahman, H.; Fan, L.; Jones, R. V. H.; Standen, M. C. H. Chem. Eur. J. 1996, 2, 1024-1030.
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Abdel-Rahman, H.2
Fan, L.3
Jones, R.V.H.4
Standen, M.C.H.5
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26
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0028790571
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Aggarwal, V. K.; Thompson, A.; Jones, R. V. H.; Standen, M. Tetrahedron: Asymmetry 1995, 6, 2557-2564.
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Aggarwal, V.K.1
Thompson, A.2
Jones, R.V.H.3
Standen, M.4
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27
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84962355379
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note
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Several freezing strategies were tested in an effort to use PM3, but this approach was found unreliable.
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28
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0000514151
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Ohno, F.; Kawashima, T.; Okazaki, R. J. Am. Chem. Soc. 1996, 118, 697-698.
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29
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84962411899
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note
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However, the solvation effect is 9 kcal/mol for 8 and 3 kcal/mol for 5, suggesting that 8 could be even more favored if optimization in solution had been available.
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30
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0000921836
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Naito, T.; Nagase, S.; Yamataka, H. J. Am. Chem. Soc. 1994, 116, 10080-10088.
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31
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84962444331
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note
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A counterion would probably be present in typical applications of sulfonium methylides, lowering the energy of the starting materials. (29) They are stationary points at the HF/6-31G* level, as discussed in Results.
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32
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33748721599
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Aggarwal, V. K.; Calamai, S.; Ford, J. G. J. Chem. Soc., Perkin Trans. 2 1997, 593-599.
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Ford, J.G.3
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33
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84962453309
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note
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Attempts to locate substituted version of B corresponding to trans-stilbene oxide formation at the HF/6-31G* level of theory were unsuccessful.
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-
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34
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84962447491
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note
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ar (ylide) torsional angle is defined by the carbon atoms in dark.
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