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The complete removal of the residual silver salts is critical for obtaining good results in the aziridination step since their presence results in the formation of black reaction crudes and strongly decreases the diastereoselectivity
-
The complete removal of the residual silver salts is critical for obtaining good results in the aziridination step since their presence results in the formation of black reaction crudes and strongly decreases the diastereoselectivity.
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CCDC 719589 contains the supplementary crystallographic data for this compound. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data- request/cif. Unpublished results.
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-
Frequencies and zero-point energy (ZPE) were also computed at the same level of theory. Final energies have been obtained using the more extended 6-311+G** basis set for all atoms: (b) McLean, A. D.; Chandler, G. S. J. Chem. Phys. 1980, 72, 5639.
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Relative free energies (in kcal/mol) were evaluated at the B3LYP/6-311+G** level with ZPE and entropy corrections evaluated at 298 K using the frequencies previously calculated at B3LYP/6-31G(d) level. Because of the importance of solvent effects, especially when charged species are involved, model structures I-IV have also been optimized in a dielectric medium mimicking THF, using the IEF-PCM model: (d) Cancès, M. T.; Mennucci, B.; Tomasi, J. J. Chem. Phys. 1997, 107, 3032.
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In the case of model transition states, this optimization including solvent effects was not possible
-
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Complexes varying C-S-O-Li and C-C-S-O dihedral bonds as well as a boat-like structure with Li atom bonded to benzylic carbon resulted in less stability (see Supporting Information complexes Ib-Id)
-
Complexes varying C-S-O-Li and C-C-S-O dihedral bonds as well as a boat-like structure with Li atom bonded to benzylic carbon resulted in less stability (see Supporting Information complexes Ib-Id).
-
-
-
-
63
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-
-
+, the more favored the planar free carbanion conformation
-
+, the more favored the planar free carbanion conformation.
-
-
-
-
64
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66249094465
-
-
-1 less stable than the corresponding cisoid one (TS1b). Probably the transoid approach in our case is destabilized due to steric interactions with the ortho TolSO group in the ylide
-
-1 less stable than the corresponding cisoid one (TS1b). Probably the transoid approach in our case is destabilized due to steric interactions with the ortho TolSO group in the ylide.
-
-
-
-
65
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66249083737
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The optimization of this type of transition states has not been still possible due to the high degree of conformational freedom shown by all the ligands around the metal. It is being tried with a simple substrate
-
The optimization of this type of transition states has not been still possible due to the high degree of conformational freedom shown by all the ligands around the metal. It is being tried with a simple substrate.
-
-
-
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