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note
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Strictly speaking, the structural features of 24 are insufficient to distinguish between the actual operation of a chair or boat transition state. The point is therefore a mute one. However, the normal energetic ordering of the two geometric options favors the chairlike option.
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8944236026
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note
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We thank Professor W. C. Still (Columbia University) for making his program available for use and Prof. K. Steliou (Boston University) for providing us with updates of this software package.
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The general experimental protocols followed in this study parallel those described in a recent report: Raquette, L. A.; Ezquerra, J.; He, W. J. Org. Chem. 1995, 60, 1435.
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