Acknowledgment. This investigation was supported by Research Grant CHE-8912745 from the National Science Foundation to whom we are grateful. The 500-MHz NMR spectrometer was purchased with funds from NSF Grant CHE-8904942. We thank Dr. James Audia and the Eli Lilly Co. for a gift of ent-Darvon alcohol. The cooperation of Professor John Dawson and Ms. Sally Kadkhodayan in some of the GC analyses was of critical importance to this ...
