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33750047976
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Racemization by Mechanism D would not result in deuterium scrambling. The microscopic reverse of Mechanism E is also possible in which 2-oxonia-Cope rearrangement proceeds through the favorable E-oxocarbenium ion, but with the alkyl substituent in a pseudoaxial orientation.
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79
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1H NMR. We cannot rule out the possibility that the trans isomer may be formed in very small quantity as a minor component.
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80
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note
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See ref 3e for a similar effect.
-
-
-
-
81
-
-
33750040677
-
-
note
-
Geometry optimizations were performed with B3LYP/6-31G* as implemented in Gaussian 03 (ref 30). Minima were characterized by their vibrational frequencies.
-
-
-
-
83
-
-
33750036229
-
-
note
-
The unexpectedly large difference in energy between 93 and 94 can be attributed to more effective stabilization of the oxocarbenium ion in 93 by π-complex formation with the more highly substituted alkene.
-
-
-
-
84
-
-
33750040104
-
-
note
-
An expanded table for this calculation is provided in the Supporting Information.
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-
-
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