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Acknowledgment is made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, and to the National Science Foundation (CHE-8305820) for support of this research. We also acknowledge the NIH for a grant used to purchase the 300-MHz NMR spectrometer.Note Added in Proof: Professor D. N. Kevill has examined 2-adamantyl triflate and has developed a YOTf scale based on this substrate. We thank Professor Kevill for informing us of his results prior to publication.

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