reactions as in other systems since the crotylboronates are very weak (soft) nucleophiles and because the trajectory of reagent approach to the carbonyl is constrained to a considerably smaller value than in biomolecular carbonyl addition reactions.11 Studies probing the generality of these conclusions are in progress and will be reported in due course.Acknowledgment. This research was supported by grants from the National Institutes of Health (GM 26782) and the National Cancer Institute (CA-29847). We are grateful to Professors Danheiser, Masamune, and Sharpless for use of their capillary GC facilities.

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