(s, 3 H), 1.59-2.78 (m, 5 H), 2.50 (s, 2 H), 3.64 (s, 3 H), 4.88 (s, 1 H), 5.1 1 (b, 2 H); mass spectrum (-HzO) calcd for 318.1942, found 318.1930. Acknowledgments. We are most grateful to the National Science Foundation and The Robert A. Welch Foundation for financial support. RL is indebted to the National Research Council, Canada, for a fellowship. ... (CDC13) 6 1.02 (s, 3 H), 1.09 (s, 3 H), 1.15 (s, 3 H), 1.29 (s, 3 H), 1.37 ... References and Notes (1) EL Rickles, NG ...