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3142700171
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note
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1H NMR spectrum clearly divided into two groups, the ax- and eq-sulfoxide groups. The coupling constants between C5H and both of the C6 methylene protons in the equatorial sulfoxides eq-9-12 were 2.5-5.4 Hz, which suggests that the relationship between H5 and H6 and H6′ of the equatorial isomers were both gauche, that is the conformation about the C5-C6 bond is gg. In contrast, the sizes of the coupling constants between H5 and one of the two H6s for the corresponding axial sulfoxides of 9-12 were large (9.3-11.7 Hz), indicating that these protons had an anti relationship. It appears that the potential 1, 3-diaxial relationship with the equatorial oxygen atom O-4 causes the tg conformation be of high energy and similarly the potential 1, 3-diaxial relationship with the axial sulfoxide oxygen atom causes the gg conformation be of high energy. Thus, the axial sulfoxides of 9-12 adopt the tg conformations about the C5-C6 bond almost exclusively, as shown
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25
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37049117290
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Buck K.W., Foster A.B., Pardoe W.D., Qadir M.H., Webber J.M. J. Chem. Soc., Chem. Commun. 1966;759-761
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(1966)
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, pp. 759-761
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Buck, K.W.1
Foster, A.B.2
Pardoe, W.D.3
Qadir, M.H.4
Webber, J.M.5
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26
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37049137417
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Foster A.B., Inch T.D., Qadir M.H., Webber J.M. J. Chem. Soc., Chem. Commun. 1968;1086-1089
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(1968)
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Foster, A.B.1
Inch, T.D.2
Qadir, M.H.3
Webber, J.M.4
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27
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3142739744
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Spartan 04 ver. 1.00 by Wavefunction Inc (18401 Von Karman Avenue, Suite 370, Irvine, CA 92612, USA) was used for the calculations
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Spartan 04 ver. 1.00 by Wavefunction Inc (18401 Von Karman Avenue, Suite 370, Irvine, CA 92612, USA) was used for the calculations
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31
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3142723575
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PC Spartan Pro ver.1.08 by Wavefunction Inc (18401 Von Karman Avenue, Suite 370, Irvine, CA 92612, USA) was used for the calculations
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PC Spartan Pro ver.1.08 by Wavefunction Inc (18401 Von Karman Avenue, Suite 370, Irvine, CA 92612, USA) was used for the calculations
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37
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3142698732
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Very small differences were observed in the chemical shifts for the C1Hax (Δδ 0.012 ppm), the remained C6H (Δδ 0.018 ppm), and C2H (Δδ 0.009 ppm) due to the isotope effect as shown in Figure 3 of the text
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Very small differences were observed in the chemical shifts for the C1Hax (Δδ 0.012 ppm), the remained C6H (Δδ 0.018 ppm), and C2H (Δδ 0.009 ppm) due to the isotope effect as shown in Figure 3 of the text
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