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15. For similar reversals of diastereoselection between organolithium and grignard reagents in carbonyl additions see for example: (a) ref. 6c;
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54
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0011294101
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note
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18. Chelation between bicoordinating Lewis acids and carbonyl oxygens is well documented: (a) ref 1d.
-
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59
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0011323939
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ch. 10, Trost, B.M., Fleming, I., Eds. Pergamon: Oxford, U.K. On the other hand, only a few known precedents involve sulfonamides
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62
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0023043811
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19. Theoretical studies predict transition states with rather obtuse angles of attack in the absence of electrophilic activation. Houk, K.N.; Paddon-Row, M.N.; Rondan, N.G.; Wu, J-D.; Brown, F.K.; Spellmeyer, D.C.; Metz, J.T.; Li, Y.; Loncharich, R.J. Science, 1986, 231, 1108.
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63
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0011377922
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note
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20. Spartan V3.1, Wavefunction, Inc.
-
-
-
-
65
-
-
0011358224
-
-
note
-
22. The atomic charges where obtained from fit to the electrostatic potential.
-
-
-
-
66
-
-
0011325830
-
-
note
-
23. The algebraic sum of the charges relative to all the atoms constituting the mesyl moiety was considered.
-
-
-
-
67
-
-
0011322183
-
-
note
-
3 electron isodensity surface gave maximum absolute values of 0.04788 and 0.04665 respectively, both located on the π-carbonyl Re faces.
-
-
-
-
68
-
-
0011337631
-
-
note
-
25. Further theoretical work at the transition state level is planned in order to obtain more information on this stereochemical model.
-
-
-
-
69
-
-
0011329491
-
-
note
-
26. Such an experiment is expected to reflect a time-averaged dynamic equilibrium resulting from the fast exchange between magnesium ion and all the Lewis basic sites (i.e. the oxygen atoms of the carbonyl, the sulfone, the oxazolidine ring, and ethyl ether).
-
-
-
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70
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0024326622
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27. Precedents of intramolecular SO - HO chelation are known. See for example: (a) Pyne, S.G.; Bloem, P.; Griffith, R. Tetrahedron, 1989, 45, 7013.
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